CN112462308A - Magnetic resonance signal receiving device and magnetic resonance equipment - Google Patents
Magnetic resonance signal receiving device and magnetic resonance equipment Download PDFInfo
- Publication number
- CN112462308A CN112462308A CN202011133677.4A CN202011133677A CN112462308A CN 112462308 A CN112462308 A CN 112462308A CN 202011133677 A CN202011133677 A CN 202011133677A CN 112462308 A CN112462308 A CN 112462308A
- Authority
- CN
- China
- Prior art keywords
- magnetic resonance
- receiving unit
- signal
- digital
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 40
- 230000001360 synchronised effect Effects 0.000 claims description 53
- 238000012545 processing Methods 0.000 claims description 41
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 238000005070 sampling Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000036961 partial effect Effects 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000002595 magnetic resonance imaging Methods 0.000 description 5
- 238000012952 Resampling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000003759 clinical diagnosis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The present disclosure relates to a magnetic resonance signal receiving apparatus and a magnetic resonance device. The magnetic resonance signal receiving apparatus includes: the device comprises at least one local coil, a front receiving unit, a rear receiving unit and a transmission cable, wherein the at least one local coil is connected with the front receiving unit, the at least one local coil and the front receiving unit are arranged on a sickbed of the magnetic resonance equipment, the rear receiving unit is arranged outside the sickbed, and the rear receiving unit is connected with the front receiving unit through the transmission cable; because the local coil and the prepositive receiving unit are arranged on the sickbed, the problems of signal-to-noise ratio deterioration and the like caused by long-distance transmission of analog signals in the prior art are avoided, and the image reconstruction unit can be ensured to reconstruct a magnetic resonance image with better quality. In addition, digital signals are transmitted between the front receiving unit and the rear receiving unit, so that a transmission cable of an analog signal is omitted, the signal to noise ratio is improved, and the space of a sickbed is saved.
Description
Technical Field
The present disclosure relates to the technical field of medical equipment, and in particular, to a magnetic resonance signal receiving apparatus and a magnetic resonance device.
Background
Magnetic Resonance Imaging (MRI) technology is to excite a subject with a constant magnetic field generated by a magnet through a radio frequency system and a gradient system to generate a magnetic resonance signal containing spatial localization information, acquire the magnetic resonance signal through a receiving device, and reconstruct an image with an image reconstruction technology, thereby obtaining a magnetic resonance image of the subject.
Magnetic resonance imaging has become one of the most important research tools in the fields of medical clinical diagnosis and basic scientific research. Acquiring an image with a high signal-to-noise ratio, and improving the signal-to-noise ratio of a signal received by a magnetic resonance receiving device are very important for the magnetic resonance receiving device. Because the original magnetic resonance signal generated by the magnetic resonance device is usually very weak, in order to acquire a magnetic resonance signal with a high signal-to-noise ratio, a series of operations such as amplification, transmission, filtering and the like are often required before the magnetic resonance signal generated by the magnetic resonance device is converted into a digital signal. However, the transmission of the magnetic resonance signal over a long distance inevitably brings about signal attenuation, thereby causing a loss of the signal-to-noise ratio of the magnetic resonance signal. On the other hand, with the development of magnetic resonance imaging technology, the number of receiving channels of the receiving apparatus is required to be more and more, and higher requirements are also made on the aspects of miniaturization, low power consumption and low cost of the receiving apparatus.
Disclosure of Invention
An object of the present disclosure is to provide a magnetic resonance signal receiving apparatus and a magnetic resonance device to solve technical problems existing in the related art.
In order to achieve the above object, a first aspect of the present disclosure provides a magnetic resonance signal receiving apparatus including: the device comprises at least one local coil, a front receiving unit, a rear receiving unit and a transmission cable, wherein the local coil is connected with the front receiving unit, the local coil and the front receiving unit are both arranged on a sickbed of the magnetic resonance equipment, the rear receiving unit is arranged outside the sickbed, and the rear receiving unit is connected with the front receiving unit through the transmission cable;
the local coil is used for receiving a magnetic resonance signal generated by the magnetic resonance equipment when the magnetic resonance detection is carried out on the detected object and sending the magnetic resonance signal to the preposed receiving unit;
the front receiving unit is used for converting the magnetic resonance signal into a digital signal and sending the digital signal to the rear receiving unit through the transmission cable;
the post receiving unit is used for carrying out digital down-conversion processing on the received digital signals and sending the processed digital signals to the image reconstruction unit so as to reconstruct a magnetic resonance image by the image reconstruction unit.
Optionally, the local coil comprises: the amplifier comprises a plurality of coil units and a plurality of amplifiers, wherein the amplifiers are connected with the coil units in a one-to-one correspondence manner;
the coil units are used for respectively receiving magnetic resonance signals generated by the magnetic resonance equipment when the magnetic resonance detection is carried out on the detected object;
the plurality of amplifiers are used for amplifying the magnetic resonance signals received by the coil units;
the front receiving unit includes: a plurality of first filters and analog-to-digital converters;
the first filters are connected with the amplifiers in a one-to-one correspondence manner and are used for filtering the magnetic resonance signals amplified by the amplifiers;
the analog-digital converter comprises a plurality of input ports, the input ports are connected with the first filters in a one-to-one correspondence mode, and the input ports are used for converting the magnetic resonance signals filtered by the first filters into digital signals.
Optionally, a serial output interface is integrated at an output end of the analog-to-digital converter, and the transmission cable is a digital serial bus;
the serial output interface is used for carrying out parallel-to-serial conversion on the parallel digital signals to obtain serial digital signals;
the input port of the post-receiving unit is integrated with a serial receiving interface, and is used for receiving the serial digital signals through the serial receiving interface, performing serial-parallel conversion on the serial digital signals to obtain parallel digital signals, and performing digital down-conversion processing on the parallel digital signals.
Optionally, the serial output interface is further configured to convert the serial digital signal into an optical signal;
accordingly, the digital serial bus is an optical fiber, and the post-receiving unit is a light-receiving unit.
Optionally, the front receiving unit is connected with the at least one partial coil via a socket.
Optionally, the number of the front receiving units, the local coils and the sockets is the same;
the front receiving unit is correspondingly connected with the local coil through a corresponding socket.
Optionally, the post-receiving unit includes a digital signal processing unit and a synchronous clock transmitting unit; the prepositive unit also comprises a synchronous clock receiving unit, and the synchronous clock receiving unit is connected with the analog-digital converter;
the synchronous clock sending unit is used for generating a synchronous clock signal according to a system clock of the magnetic resonance equipment and sending the synchronous clock signal to the synchronous clock receiving unit;
the synchronous clock receiving unit is used for acquiring the system clock according to the received synchronous clock signal and generating a sampling clock with a specified frequency based on the system clock;
the analog-digital converter is used for sampling the magnetic resonance signal filtered by the first filter according to the sampling clock to obtain a digital signal;
the digital signal processing unit is connected with the analog-digital converter through the transmission cable and is used for carrying out digital down-conversion processing on the received digital signal.
Optionally, the synchronous clock sending unit includes: the oscillator, the modulator, the power amplifier, the second filter and the transmitting antenna are connected in sequence;
wherein the oscillator is used for generating a high-frequency carrier wave, and the frequency of the high-frequency carrier wave is greater than the central frequency of the magnetic resonance signal;
the modulator is used for modulating the synchronous clock signal onto the high-frequency carrier wave;
accordingly, the synchronous clock receiving unit includes: the receiving antenna, the third filter, the demodulator and the phase-locked loop are connected in sequence.
Optionally, the synchronous clock sending unit sends the synchronous clock signal to the synchronous clock receiving unit in a wireless sending manner.
Optionally, the front-end receiving unit further includes a plurality of gain modules;
the gain modules are connected with the first filters in a one-to-one correspondence manner and used for adjusting the amplitude values of the magnetic resonance signals filtered by the first filters;
the input ports of the analog-to-digital converter are connected with the gain modules in a one-to-one correspondence manner and are used for converting the magnetic resonance signals of which the amplitudes are adjusted by the gain modules into digital signals.
Optionally, the front-end receiving unit further includes a plurality of mixer devices, the plurality of mixer devices are connected to the plurality of first filters in a one-to-one correspondence, and the plurality of input ports of the analog-to-digital converter are connected to the plurality of mixer devices in a one-to-one correspondence.
The second aspect of the present disclosure also provides a magnetic resonance apparatus comprising: an image reconstruction unit and the magnetic resonance signal receiving apparatus provided by the first aspect of the present disclosure;
the image reconstruction unit is connected with the magnetic resonance signal receiving device and used for reconstructing a magnetic resonance image according to the digital signal generated by the magnetic resonance signal receiving device.
Through the technical scheme, the local coil and the front receiving unit are arranged on the sickbed, so that the problem that the signal-to-noise ratio is deteriorated due to long-distance transmission of analog signals in the traditional technology when magnetic resonance signals are transmitted between the local coil and the front receiving unit is solved, and the front receiving unit can receive the magnetic resonance signals with higher signal-to-noise ratio. Moreover, the front receiving unit converts the magnetic resonance signals into digital signals and sends the digital signals to the rear receiving unit far away from the front receiving unit, so that the rear receiving unit can also receive the digital signals with high signal-to-noise ratio, and the image reconstruction unit can be ensured to reconstruct magnetic resonance images with good quality. In addition, only partial units of the receiving device are arranged on the sickbed, so that the size of parts arranged on the sickbed is small, and the space of the sickbed is saved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic diagram of a related art magnetic resonance receiving apparatus according to an exemplary embodiment.
Fig. 2 is a block diagram illustrating a magnetic resonance signal receiving apparatus according to an exemplary embodiment.
Fig. 3 is a schematic diagram of a magnetic resonance signal receiving apparatus according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the related art, the following two magnetic resonance signal receiving apparatuses are mainly used for receiving magnetic resonance signals generated by a magnetic resonance device.
In the first receiving device, the coil and the receiver are separately disposed, that is, the coil is disposed on the magnetic resonance patient bed, and the receiver is disposed outside the magnetic resonance patient bed, and the coil and the receiver need to be connected through a transmission cable. Fig. 1 is a schematic diagram of a related art magnetic resonance receiving apparatus according to an exemplary embodiment. As shown in fig. 1, the coil may include n receiving channels and n amplifiers, and the n receiving channels and the n amplifiers are connected in a one-to-one correspondence. The receiver comprises n first filters and a high-speed sampling analog-to-digital converter ADC having n input ports and a digital signal processing unit. The n first filters are connected with the n amplifiers in a one-to-one correspondence mode, a plurality of input ports of the high-speed sampling analog-digital converter ADC are connected with the n first filters in a one-to-one correspondence mode, an output port of the high-speed sampling analog-digital converter ADC is connected with the digital signal processing unit, and the digital signal processing unit is connected with the reconstruction computer through a communication bus.
In fig. 1, the receiver is connected to the coil by a transmission cable, and the transmission cable is a coaxial cable. Furthermore, the number of transmission cables is n, i.e. each amplifier is connected to one first filter via one transmission cable. It should be noted that, since the magnetic resonance signal is an analog signal, in fig. 1, the signal transmitted by the transmission cable is an analog signal. Also, typically, the distance between the receiver and the coil is larger than 10m, even more than 30m, i.e. the length of the transmission cable is long. Therefore, when the magnetic resonance signals are transmitted through the transmission cable, the magnetic resonance signals are inevitably attenuated too much, the signal-to-noise ratio is seriously reduced, and finally the reconstructed magnetic resonance image quality is poor.
In the second receiver, the coil and the receiver are designed in an integrated manner, i.e. the receiver is integrated inside the coil or on the patient's bed. The receiver is typically designed as an integrated circuit to reduce the size and facilitate integration within the coil. Therefore, the coil and the receiver do not need to transmit analog signals through a transmission cable, and the attenuation of magnetic resonance signals and the reduction of signal-to-noise ratio can be effectively prevented. However, the integrated circuit chip has a high design difficulty and a high cost, which results in a high cost of the receiving device.
In addition, in the related art, the magnetic resonance signal may be received wirelessly, but since there are many magnetic resonance signal channels, the data bandwidth is large, and the requirement for the wireless transmission bandwidth is high, the wireless communication method is difficult to implement, and the cost of the modem technology is increased.
In view of this, the present disclosure provides a magnetic resonance signal receiving apparatus and a magnetic resonance device, which may not affect the signal-to-noise ratio of the magnetic resonance signal during the signal transmission process, but may also reduce the design difficulty of the integrated circuit chip and the cost of the magnetic resonance signal receiving apparatus.
The magnetic resonance signal receiving device provided by the present disclosure may include at least one local coil, a front receiving unit, a rear receiving unit, and a transmission cable. Among them, the local coil may be a coil for receiving a magnetic resonance signal of any part of an object to be detected (e.g., a human body), and for example, it may be a head coil (a coil for receiving a head magnetic resonance signal), an abdomen coil (a coil for receiving an abdomen magnetic resonance signal), or the like. For convenience of description, the magnetic resonance signal receiving apparatus including a local coil is explained as an example.
Fig. 2 is a block diagram illustrating a magnetic resonance signal receiving apparatus according to an exemplary embodiment. As shown in fig. 2, the magnetic resonance signal receiving apparatus may include: a local coil 201, a front receiver unit 202, a rear receiver unit 203 and a transmission cable 204. The local coil 201 is connected to the front receiving unit 202, the local coil 201 and the front receiving unit 202 are both disposed on a hospital bed of the magnetic resonance apparatus, the rear receiving unit 203 is disposed outside the hospital bed, and the rear receiving unit 203 is connected to the front receiving unit 202 through the transmission cable 204.
In the magnetic resonance signal receiving apparatus shown in fig. 2, the local coil 201 receives a magnetic resonance signal generated by a magnetic resonance device when performing magnetic resonance detection on a subject, and transmits the magnetic resonance signal to the pre-receiving unit 202. The front-end receiving unit 202 converts the received magnetic resonance signal into a digital signal, and transmits the digital signal to the rear-end receiving unit 203 via the transmission cable 204. Then, the post-receiving unit 203 performs digital down-conversion processing on the received digital signal, and sends the processed digital signal to the image reconstruction unit, so as to reconstruct a magnetic resonance image by the image reconstruction unit.
The related art may be adopted to convert the analog signal into the digital signal and perform digital down-conversion processing on the digital signal, which is not specifically limited by the present disclosure.
In the present disclosure, since the local coil 201 and the front receiving unit 202 are both located on the patient bed of the magnetic resonance apparatus and are close to each other, the magnetic resonance signal attenuation is small during transmission, and the signal-to-noise ratio loss is small. In addition, although the rear receiving unit 203 is disposed outside the patient's bed and receives the signal transmitted by the front receiving unit 202 via the transmission cable 204, since the signal transmitted by the transmission cable 204 is a digital signal, attenuation of the signal and loss of the signal-to-noise ratio are not caused, the rear receiving unit 203 can receive a signal with a higher signal-to-noise ratio even if disposed outside the patient's bed, and the image reconstructing unit can reconstruct a magnetic resonance image with better quality based on the signal with the higher signal-to-noise ratio.
By adopting the technical scheme, because the local coil and the prepositive receiving unit are both arranged on the sickbed, when the magnetic resonance signal is transmitted between the local coil and the prepositive receiving unit, the signal-to-noise ratio of the magnetic resonance signal is not influenced, so that the prepositive receiving unit can receive the magnetic resonance signal with higher signal-to-noise ratio. And the front receiving unit converts the magnetic resonance signals into digital signals and sends the digital signals to the rear receiving unit far away from the front receiving unit, so that the signal-to-noise ratio of the signals is not influenced, the rear receiving unit can also receive the signals with high signal-to-noise ratio, and the image reconstruction unit can be ensured to reconstruct magnetic resonance images with good quality. In addition, only partial units of the receiving device are arranged on the sickbed, so that the size of the parts arranged on the sickbed is smaller, and the design difficulty of the integrated circuit chip and the cost of the magnetic resonance signal receiving device are effectively reduced.
In one embodiment, the front receiving unit 202 may be connected to at least one partial coil via a socket. Wherein the socket is located on a patient bed of the magnetic resonance apparatus.
It should be noted that the socket type interconnection can minimize the transmission distance of the magnetic resonance signal between the local coil and the front receiving unit, so in this embodiment, the coil and the front receiving unit are interconnected through the socket on the patient bed, and the attenuation of the magnetic resonance signal and the loss of the signal-to-noise ratio can be further reduced.
In practice, the magnetic resonance apparatus can usually detect different parts of the subject, and therefore, the magnetic resonance apparatus can include a plurality of local coils. In one possible approach: a plurality of local coils are connected to a front-end receiving unit via a socket. In another possible approach: the number of the preposed receiving units, the local coils and the sockets is the same, and the preposed receiving units are correspondingly connected with the local coils through the corresponding sockets. For example, assuming that the numbers of the pre-receiving units, the local coils and the sockets are the same and are m (m is an integer greater than or equal to 1), the ith pre-receiving unit is connected with the ith local coil through the ith socket, where i ranges from 1 to m. In this way, for each magnetic resonance signal received by each local coil, the corresponding pre-receiving unit can be used to process the magnetic resonance signal, and the multiple pre-receiving units can process the magnetic resonance signals of different parts in parallel, thereby improving the efficiency of processing the magnetic resonance signal.
The local coil, the front receiving unit and the rear receiving unit shown in fig. 2 are described in detail below, respectively.
In practical applications, the magnetic resonance signal generated by the magnetic resonance apparatus is weak, and after the magnetic resonance signal is received, the weak magnetic resonance signal needs to be amplified to construct a magnetic resonance image, so the local coil 201 shown in fig. 2 may include a plurality of coil units and a plurality of amplifiers, and the plurality of amplifiers are connected to the plurality of coil units in a one-to-one correspondence manner.
Fig. 3 is a schematic diagram of a magnetic resonance signal receiving apparatus according to an exemplary embodiment. As shown in fig. 3, assuming that the number of coil units and amplifiers is n, each coil unit 2011 is connected to one amplifier 2012. Each coil unit 2011 is configured to receive a magnetic resonance signal generated by the magnetic resonance device when performing magnetic resonance detection on the subject, and each amplifier 2012 is configured to amplify the magnetic resonance signal received by the coil unit 2011 connected thereto.
In addition, in practical applications, considering that noise generally exists in the magnetic resonance signal, in the present disclosure, the pre-receiving unit 202 may include a plurality of first filters and analog-to-digital converters. The number of the first filters is also n, and the number of the analog-to-digital converters may be one or more, which is not specifically limited in this disclosure, and only the number of the input ports of the analog-to-digital converters is n.
As shown in fig. 3, the number of the first filters 2021 is n, and the n first filters 2021 are connected to the n amplifiers 2012 in a one-to-one correspondence manner, so that each first filter 2021 can filter the magnetic resonance signal amplified by the amplifier 2012 connected thereto. The first filter 2021 may be an anti-aliasing filter, which may be, for example, a surface acoustic filter, a multi-stage LC band pass filter, or a low pass filter. The analog-to-digital converter 2022 may include n input ports, wherein the n input ports are connected to the n first filters 2021 in a one-to-one correspondence for converting the magnetic resonance signals filtered by the first filters into digital signals.
It is worth mentioning that the analog-to-digital converter 2022 may receive n sets of filtered magnetic resonance signals in parallel through n input ports, and accordingly, n sets of digital signals are obtained after conversion. Since the analog-digital converter 2022 and the post-receiving unit 203 are connected by a cable, if the n sets of digital signals are still transmitted to the post-receiving unit 203 in parallel via the transmission cable 204, it is necessary to route n × k transmission cables between the analog-digital converter 2022 and the post-receiving unit 203, where k is the number of bits included in each set of digital signals. Thus, the wiring workload is increased, and the structure of the magnetic resonance signal receiving apparatus is complicated.
Therefore, in order to reduce the workload of the layout and simplify the structure of the magnetic resonance signal receiving apparatus, in one possible mode, the output terminal of the analog-to-digital converter 2022 is integrated with a serial output interface. The serial output interface is used for carrying out parallel-to-serial conversion on the parallel digital signals to obtain serial digital signals. For example, the serial output interface may encode and parallel-to-serial convert the initial n sets of digital signals converted by the analog-to-digital converter 2022 into a set of digital signals.
Accordingly, the transmission cable 204 in fig. 2 is used for transmitting serial digital signals, i.e., the communication protocol between the front receiving unit and the rear receiving unit is a digital serial bus. For example, the digital serial bus is a high-speed digital serial bus with a fixed delay. The input port of the post-receiving unit 203 is integrated with a serial receiving interface, and is configured to receive a serial digital signal through the serial receiving interface, perform serial-to-parallel conversion on the serial digital signal to obtain a parallel digital signal, and then perform digital down-conversion processing on the parallel digital signal.
In addition, the serial output interface is also used for converting serial digital signals into optical signals. For example, the serial output interface may further convert the digital signal into an optical signal before outputting the set of digital signals. Accordingly, the digital serial bus is an optical fiber capable of transmitting an optical signal, and the post-receiving unit 203 is an optical receiving unit capable of receiving an optical signal.
As shown in fig. 3, the post-receiving unit 203 may include a digital signal processing unit 2031. An input port of the digital signal processing unit 2031 is integrated with a serial reception interface, and the digital signal processing unit 2031 is configured to perform digital down-conversion processing on a received digital signal. The dsp 2031 may be a field Programmable Gate array (fpga), a dedicated dsp (digital Signal processor), or a dedicated special custom logic asic (application Specific Integrated circuit), etc.
For example, the digital signal processing unit 2031 may be programmed to perform digital mixing, digital filtering, and decimation operations to convert digital signals into digital down-converted data.
The signal transmission method is described as a complete embodiment.
First, the coil unit 2011 in the local coil 201 receives an original magnetic resonance signal generated by the magnetic resonance apparatus at the time of magnetic resonance detection of the subject. The original magnetic resonance signal generated by the magnetic resonance apparatus is weak in strength and contains noise.
Next, the amplifier 2012 in the local coil 201 amplifies the original magnetic resonance signal received by the coil unit to enhance the strength of the magnetic resonance signal.
Next, the first filter 2021 in the pre-receiving unit 202 performs filtering processing on the amplified magnetic resonance signal. And the analog-to-digital converter 2022 converts the magnetic resonance signal filtered by the first filter 2021 into a digital signal.
Finally, the analog-to-digital converter 2022 sends the converted digital signal to the digital signal processing unit 2031. The digital processing unit 2031 may perform digital down-conversion processing on the digital signal after receiving the digital signal. The data after the digital down-conversion processing is finally transmitted to the image reconstruction unit 300 via the communication bus 400, so that the image reconstruction unit 300 reconstructs a magnetic resonance image. The image reconstruction unit 300 may be a reconstruction computer, and the communication bus 400 may be a PCI-E bus or a network TCP-IP bus.
In one embodiment, the analog-to-digital converter 2022 may convert the analog signal (i.e., the magnetic resonance signal in the foregoing) into a digital signal by way of sampling. It should be noted that, in order to ensure phase synchronization during magnetic resonance imaging, the sampling clock of the analog-to-digital converter 2022 needs to be consistent with the clock for performing digital down-conversion processing on the digital signal by the digital processing unit 2031.
In the related art, the sampling clock of the analog-to-digital converter 2022 and the clock for the digital processing unit 2031 to perform digital down-conversion processing on the digital signal are based on independent clocks. In this case, in order to ensure that the sampling clock of the analog-to-digital converter 2022 is synchronized with the clock of the digital processing unit 2031 for performing digital down-conversion processing on the digital signal, a phase detector and a resampling unit must be provided in the magnetic resonance signal receiving apparatus to achieve clock synchronization by the phase detector and the resampling unit. Therefore, on one hand, the function of the magnetic resonance signal receiving device can be additionally added, and on the other hand, the requirement on the synchronism of the clock is extremely high due to the magnetic resonance imaging, the clock synchronization mode is complex, and the difficulty in engineering development is high. In addition, the comparison source of the phase detector is the recovered clock of the serial receiving interface, and the accuracy and stability of the recovered clock are easily influenced by the temperature of the device.
In order to avoid the above problem, in the present disclosure, the sampling clock of the analog-to-digital converter 2022 and the clock of the digital processing unit 2031 performing digital down-conversion processing on the digital signal may use the same clock base. Illustratively, the post-receiving unit 203 may further include a synchronous clock transmitting unit 2032. Accordingly, the front-end receiving unit 202 may further include a synchronous clock receiving unit 2023, and the synchronous clock receiving unit 2023 is connected to the analog-to-digital converter 2022.
Among them, the synchronized clock transmitting unit 2032 included in the post-receiving unit 203 is configured to generate a synchronized clock signal according to the system clock of the magnetic resonance apparatus and transmit the synchronized clock signal to the synchronized clock receiving unit 2023 in the pre-receiving unit 202. The synchronous clock transmitting unit 2032 transmits the synchronous clock signal to the synchronous clock receiving unit 2023 by wireless transmission, and there is no need to arrange a synchronous clock cable in the patient bed of the magnetic resonance apparatus.
It should be noted that the clock generated by the digital processing unit 2031 performing digital down conversion processing on the digital signal is the system clock of the magnetic resonance apparatus.
When receiving the synchronous clock signal, the synchronous clock receiving unit 2023 in the front end receiving unit 202 may acquire the system clock according to the synchronous clock signal, and further generate a sampling clock of a specified frequency according to the system clock. The sampling clock is used to indicate the point in time at which the analog-to-digital converter 2022 samples. After receiving the sampling clock, the analog-to-digital converter 2022 samples the magnetic resonance signal filtered by the first filter 2021 according to the sampling clock, thereby obtaining a digital signal.
With the above technical solution, since the sampling clock of the adc 2022 is synchronized with the clock of the digital signal processing unit 2031 performing digital down conversion processing on the digital signal, the digital signal processing unit 2031 can directly perform digital down conversion processing on the digital signal after receiving the digital signal sent by the adc 2022, and does not need to perform synchronization by using a phase detector and a resampling module, which simplifies the structure of the magnetic resonance signal receiving apparatus and the clock synchronization method.
Illustratively, as shown in fig. 3, the above-mentioned synchronous clock transmitting unit 2032 may include an oscillator, a modulator, a power amplifier, a second filter, and a transmitting antenna, which are connected in sequence. The oscillator is used for generating a high-frequency carrier wave, and the frequency of the high-frequency carrier wave is greater than the central frequency of the magnetic resonance signal. The modulator is used for modulating the synchronous clock signal to the high-frequency carrier wave. In this way, it is easy to distinguish between the magnetic resonance signal and the clock signal when synchronizing the clock signal transmission.
The power amplifier is used for amplifying a high-frequency carrier carrying a clock signal. The second filter is used for filtering the amplified high-frequency carrier carrying the clock signal. The transmitting antenna is configured to transmit the filtered high-frequency carrier carrying the clock signal to the synchronous clock receiving unit 2023.
The synchronous clock receiving unit 2023 may include a receiving antenna, a third filter, a demodulator, and a phase locked loop, which are connected in sequence. The receiving antenna is used for receiving the high-frequency carrier which carries the clock signal and is sent by the sending antenna. The third filter is used for filtering the high-frequency carrier wave carrying the clock signal again. The demodulator is used for analyzing a clock signal from a high-frequency carrier carrying the clock signal. The phase locked loop is used to determine the sampling clock of the adc 2022 from the system clock, and the sampling clock is synchronized with the system clock.
The demodulation method of the demodulator corresponds to the modulation method of the modulator. For example, the modulation scheme of the modulator is an amplitude modulation scheme, a phase modulation scheme, or a frequency modulation scheme. Accordingly, the demodulation mode of the demodulator may be an amplitude detection mode, a phase detector mode or a frequency detector mode.
It should be noted that, since the magnetic resonance signal of the corresponding portion of the subject acquired by each local coil requires a sampling clock when sampling, the synchronous clock receiving unit 2023 may output one sampling clock for each local coil, that is, when the number of local coils is m, the synchronous clock receiving unit 2023 needs to output m sampling clocks.
Furthermore, a gain module may be disposed between the first filter 2021 and the analog-to-digital converter 2022 of the pre-receiving unit 202, and the gain module is configured to adjust the amplitude or power of the magnetic resonance signal filtered by the first filter. The number of gain modules is the same as the number of first filters 2021 and the number of input ports of the analog-to-digital converter 2022. The gain module may comprise a positive gain module for increasing the magnetic resonance signal amplitude or power and/or a negative gain module (attenuation module) for decreasing the magnetic resonance signal amplitude or power.
The plurality of gain modules are connected to the plurality of first filters in a one-to-one correspondence, and each gain module is configured to adjust an amplitude of the magnetic resonance signal filtered by the first filter 2021 connected thereto. A plurality of input ports of the analog-to-digital converter 2022 are connected to the plurality of gain modules in a one-to-one correspondence manner, and are configured to convert the magnetic resonance signal whose amplitude is adjusted by the gain modules into a digital signal.
The pre-receiving unit 202 may further include a plurality of mixer devices, which are connected to the plurality of first filters 2021 in a one-to-one correspondence, and a plurality of input ports of the analog-to-digital converter 2022 are connected to the plurality of mixer devices in a one-to-one correspondence. In this way, the analog-to-digital converter 2022 can sample the magnetic resonance signal by using an extrapolation sampling method to obtain a corresponding digital signal.
Based on the same inventive concept, the present disclosure also provides a magnetic resonance apparatus, including: an image reconstruction unit and the magnetic resonance signal receiving apparatus; the image reconstruction unit is connected with the magnetic resonance signal receiving device and used for reconstructing a magnetic resonance image according to the digital signals generated by the magnetic resonance signal receiving device.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (12)
1. A magnetic resonance signal receiving apparatus, comprising: the device comprises at least one local coil, a front receiving unit, a rear receiving unit and a transmission cable, wherein the local coil is connected with the front receiving unit, the local coil and the front receiving unit are both arranged on a sickbed of the magnetic resonance equipment, the rear receiving unit is arranged outside the sickbed, and the rear receiving unit is connected with the front receiving unit through the transmission cable;
the local coil is used for receiving a magnetic resonance signal generated by the magnetic resonance equipment when the magnetic resonance detection is carried out on the detected object and sending the magnetic resonance signal to the preposed receiving unit;
the front receiving unit is used for converting the magnetic resonance signal into a digital signal and sending the digital signal to the rear receiving unit through the transmission cable;
the post receiving unit is used for carrying out digital down-conversion processing on the received digital signals and sending the processed digital signals to the image reconstruction unit so as to reconstruct a magnetic resonance image by the image reconstruction unit.
2. The receiving device of claim 1,
the local coil includes: the amplifier comprises a plurality of coil units and a plurality of amplifiers, wherein the amplifiers are connected with the coil units in a one-to-one correspondence manner;
the coil units are used for respectively receiving magnetic resonance signals generated by the magnetic resonance equipment when the magnetic resonance detection is carried out on the detected object;
the plurality of amplifiers are used for amplifying the magnetic resonance signals received by the coil units;
the front receiving unit includes: a plurality of first filters and analog-to-digital converters;
the first filters are connected with the amplifiers in a one-to-one correspondence manner and are used for filtering the magnetic resonance signals amplified by the amplifiers;
the analog-digital converter comprises a plurality of input ports, the input ports are connected with the first filters in a one-to-one correspondence mode, and the input ports are used for converting the magnetic resonance signals filtered by the first filters into digital signals.
3. The receiving device according to claim 2, wherein the output end of the analog-to-digital converter is integrated with a serial output interface, and the transmission cable is a digital serial bus;
the serial output interface is used for carrying out parallel-to-serial conversion on the parallel digital signals to obtain serial digital signals;
the input port of the post-receiving unit is integrated with a serial receiving interface, and is used for receiving the serial digital signals through the serial receiving interface, performing serial-parallel conversion on the serial digital signals to obtain parallel digital signals, and performing digital down-conversion processing on the parallel digital signals.
4. The receiving device of claim 3, wherein the serial output interface is further configured to convert the serial digital signal into an optical signal;
accordingly, the digital serial bus is an optical fiber, and the post-receiving unit is a light-receiving unit.
5. Receiving device according to claim 1, wherein the front receiving unit is connected with the at least one partial coil via a socket.
6. The receiving device according to claim 5, wherein the number of the front receiving units, the local coils, and the sockets is the same;
the front receiving unit is correspondingly connected with the local coil through a corresponding socket.
7. The receiving apparatus according to claim 2, wherein the post-receiving unit includes a digital signal processing unit and a synchronous clock transmitting unit; the prepositive unit also comprises a synchronous clock receiving unit, and the synchronous clock receiving unit is connected with the analog-digital converter;
the synchronous clock sending unit is used for generating a synchronous clock signal according to a system clock of the magnetic resonance equipment and sending the synchronous clock signal to the synchronous clock receiving unit;
the synchronous clock receiving unit is used for acquiring the system clock according to the received synchronous clock signal and generating a sampling clock with a specified frequency based on the system clock;
the analog-digital converter is used for sampling the magnetic resonance signal filtered by the first filter according to the sampling clock to obtain a digital signal;
the digital signal processing unit is connected with the analog-digital converter through the transmission cable and is used for carrying out digital down-conversion processing on the received digital signal.
8. The reception apparatus according to claim 7, wherein the synchronous clock transmission unit includes: the oscillator, the modulator, the power amplifier, the second filter and the transmitting antenna are connected in sequence;
wherein the oscillator is used for generating a high-frequency carrier wave, and the frequency of the high-frequency carrier wave is greater than the central frequency of the magnetic resonance signal;
the modulator is used for modulating the synchronous clock signal onto the high-frequency carrier wave;
accordingly, the synchronous clock receiving unit includes: the receiving antenna, the third filter, the demodulator and the phase-locked loop are connected in sequence.
9. The receiving device of claim 7,
and the synchronous clock sending unit sends the synchronous clock signal to the synchronous clock receiving unit in a wireless sending mode.
10. The receiving device of claim 2, wherein the pre-receiving unit further comprises a plurality of gain modules;
the gain modules are connected with the first filters in a one-to-one correspondence manner and used for adjusting the amplitude values of the magnetic resonance signals filtered by the first filters;
the input ports of the analog-to-digital converter are connected with the gain modules in a one-to-one correspondence manner and are used for converting the magnetic resonance signals of which the amplitudes are adjusted by the gain modules into digital signals.
11. The apparatus according to claim 2, wherein the pre-receiving unit further comprises a plurality of mixing devices, the plurality of mixing devices are connected to the plurality of first filters in a one-to-one correspondence, and the plurality of input ports of the analog-to-digital converter are connected to the plurality of mixing devices in a one-to-one correspondence.
12. A magnetic resonance apparatus, characterized by comprising: an image reconstruction unit and a magnetic resonance signal receiving apparatus of any one of claims 1 to 11;
the image reconstruction unit is connected with the magnetic resonance signal receiving device and used for reconstructing a magnetic resonance image according to the digital signal generated by the magnetic resonance signal receiving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011133677.4A CN112462308A (en) | 2020-10-21 | 2020-10-21 | Magnetic resonance signal receiving device and magnetic resonance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011133677.4A CN112462308A (en) | 2020-10-21 | 2020-10-21 | Magnetic resonance signal receiving device and magnetic resonance equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112462308A true CN112462308A (en) | 2021-03-09 |
Family
ID=74833234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011133677.4A Pending CN112462308A (en) | 2020-10-21 | 2020-10-21 | Magnetic resonance signal receiving device and magnetic resonance equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112462308A (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170123A (en) * | 1989-08-11 | 1992-12-08 | Picker International, Inc. | Magnetic resonance imager with digital transmitter/receiver |
| US20090286478A1 (en) * | 2008-05-14 | 2009-11-19 | Stephan Biber | Arrangement to transmit magnetic resonance signals |
| US20090322335A1 (en) * | 2008-06-30 | 2009-12-31 | Kabushiki Kaisha Toshiba | Magnetic resonance diagnostic apparatus, magnetic resonance diagnostic main unit and coil unit |
| US20100117649A1 (en) * | 2008-11-11 | 2010-05-13 | Toshiyuki Nakanishi | Magnetic resonance imaging apparatus |
| US20100260293A1 (en) * | 2007-12-11 | 2010-10-14 | Koninklijke Philips Electronics N.V. | clock generation in mri receivers |
| US20110109315A1 (en) * | 2009-11-06 | 2011-05-12 | Stephan Biber | Mr signal transmission in a local coil arrangement |
| CN102565733A (en) * | 2011-12-12 | 2012-07-11 | 中国科学院深圳先进技术研究院 | Magnetic resonance multi-core array radio frequency device and magnetic resonance signal receiving method |
| US20120286787A1 (en) * | 2009-12-17 | 2012-11-15 | Koninklijke Philips Electronics N.V. | Direct digital receiver with local free running clock |
| US20140062480A1 (en) * | 2012-09-05 | 2014-03-06 | Jan Bollenbeck | Arrangement for the Transmission of Magnetic Resonance Signals |
| CN104950271A (en) * | 2014-03-28 | 2015-09-30 | 西门子(深圳)磁共振有限公司 | Receiver for magnetic resonance imaging system, and magnetic resonance imaging system |
| US20150276910A1 (en) * | 2012-12-18 | 2015-10-01 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| US20150285887A1 (en) * | 2014-04-02 | 2015-10-08 | Jan Bollenbeck | Reception System for Local Coils of a Magnetic Resonance Imaging System |
| US20160054405A1 (en) * | 2013-04-09 | 2016-02-25 | Koninklijke Philips N.V. | Radio frequency antenna device for generating a digital magnetic resonance information signal |
| US20170082706A1 (en) * | 2015-09-17 | 2017-03-23 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus and wireless rf coil apparatus |
| CN107247245A (en) * | 2017-05-17 | 2017-10-13 | 上海东软医疗科技有限公司 | Receiver, method for receiving and processing signal and MR imaging apparatus |
| CN108020799A (en) * | 2016-10-31 | 2018-05-11 | 上海东软医疗科技有限公司 | A kind of NMR signal receiver and nuclear magnetic resonance equipment |
-
2020
- 2020-10-21 CN CN202011133677.4A patent/CN112462308A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170123A (en) * | 1989-08-11 | 1992-12-08 | Picker International, Inc. | Magnetic resonance imager with digital transmitter/receiver |
| US20100260293A1 (en) * | 2007-12-11 | 2010-10-14 | Koninklijke Philips Electronics N.V. | clock generation in mri receivers |
| US20090286478A1 (en) * | 2008-05-14 | 2009-11-19 | Stephan Biber | Arrangement to transmit magnetic resonance signals |
| US20090322335A1 (en) * | 2008-06-30 | 2009-12-31 | Kabushiki Kaisha Toshiba | Magnetic resonance diagnostic apparatus, magnetic resonance diagnostic main unit and coil unit |
| US20100117649A1 (en) * | 2008-11-11 | 2010-05-13 | Toshiyuki Nakanishi | Magnetic resonance imaging apparatus |
| US20110109315A1 (en) * | 2009-11-06 | 2011-05-12 | Stephan Biber | Mr signal transmission in a local coil arrangement |
| US20120286787A1 (en) * | 2009-12-17 | 2012-11-15 | Koninklijke Philips Electronics N.V. | Direct digital receiver with local free running clock |
| US20140361775A1 (en) * | 2011-12-12 | 2014-12-11 | Shenzhen Institutes Of Advanced Technology Chinese Academy Of Sciences | Magnetic resonance multi-core array radio frequency device and magnetic resonance signal receiving method |
| CN102565733A (en) * | 2011-12-12 | 2012-07-11 | 中国科学院深圳先进技术研究院 | Magnetic resonance multi-core array radio frequency device and magnetic resonance signal receiving method |
| US20140062480A1 (en) * | 2012-09-05 | 2014-03-06 | Jan Bollenbeck | Arrangement for the Transmission of Magnetic Resonance Signals |
| US20150276910A1 (en) * | 2012-12-18 | 2015-10-01 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| US20160054405A1 (en) * | 2013-04-09 | 2016-02-25 | Koninklijke Philips N.V. | Radio frequency antenna device for generating a digital magnetic resonance information signal |
| CN104950271A (en) * | 2014-03-28 | 2015-09-30 | 西门子(深圳)磁共振有限公司 | Receiver for magnetic resonance imaging system, and magnetic resonance imaging system |
| US20150285887A1 (en) * | 2014-04-02 | 2015-10-08 | Jan Bollenbeck | Reception System for Local Coils of a Magnetic Resonance Imaging System |
| CN104977551A (en) * | 2014-04-02 | 2015-10-14 | 西门子公司 | Reception System For Local Coils Of A Magnetic Resonance Imaging System |
| US20170082706A1 (en) * | 2015-09-17 | 2017-03-23 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus and wireless rf coil apparatus |
| CN108020799A (en) * | 2016-10-31 | 2018-05-11 | 上海东软医疗科技有限公司 | A kind of NMR signal receiver and nuclear magnetic resonance equipment |
| CN107247245A (en) * | 2017-05-17 | 2017-10-13 | 上海东软医疗科技有限公司 | Receiver, method for receiving and processing signal and MR imaging apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5372008B2 (en) | Improved clock generation in MRI receivers | |
| EP1810047B1 (en) | Rf receive coil assembly with individual digitizers and means for synchronization thereof | |
| CN101581771B (en) | Arrangement to transmit magnetic resonance signals | |
| CN102053233B (en) | MR Signal transmissions in local coil device | |
| US10126384B2 (en) | Receiver of magnetic resonance system and magnetic resonance system | |
| EP2984498B1 (en) | Radio frequency antenna device for generating a digital magnetic resonance information signal | |
| US20090096455A1 (en) | Arrangement to transmit magnetic resonance signals | |
| CN108872893B (en) | Multi-core multichannel parallel acquisition nuclear magnetic resonance receiver | |
| JP2009511157A (en) | RF antenna with integrated electronic circuit | |
| JP2006102493A (en) | Magnetic resonance detector and detecting method therefor | |
| US9411029B2 (en) | Magnetic resonance tomography system, receive apparatus and method | |
| US7449886B2 (en) | MR receiver assembly having readout cables capable of multiple channel transmissions | |
| CN103105599B (en) | Magnetic resonance receiving coil with high-speed serial interface | |
| JP2019072469A (en) | Heterodyne-mimicking adapter | |
| CN107290697B (en) | Magnetic resonance radio frequency coil and magnetic resonance system | |
| CN107561464B (en) | Magnetic resonance radio frequency coil and magnetic resonance system | |
| CN112462308A (en) | Magnetic resonance signal receiving device and magnetic resonance equipment | |
| US10365335B2 (en) | Magnetic resonance imaging apparatus, receiving coil, couch, and relay device | |
| CN216209811U (en) | Magnetic resonance coil assembly, scanning device and magnetic resonance imaging system | |
| US11143724B2 (en) | Receiving device for frequency-multiplexed signals | |
| CN114325519A (en) | Local coil, system receiver, wireless transmission system, method and imaging system | |
| Wei et al. | Digital Wireless transmission for MRI | |
| CN113359075A (en) | High-performance magnetic resonance imaging spectrometer | |
| CN115001419A (en) | Photoelectric isolated high-frequency digital phase-locked amplifier | |
| CN111880132A (en) | Magnetic resonance coil assembly, scanning device and magnetic resonance imaging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210309 |
|
| RJ01 | Rejection of invention patent application after publication |