CN115951282A - Magnetic resonance system - Google Patents
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Abstract
The present application relates to a magnetic resonance system. The magnetic resonance system comprises an intelligent detection device, a magnetic resonance control unit and a scanning unit, wherein the intelligent detection device performs physiological detection on a person to be detected and obtains physiological characteristic parameters, the intelligent detection device is connected with the magnetic resonance control unit, the magnetic resonance control unit collects the physiological characteristic parameters, selects a scanning mode according to the physiological characteristic parameters and determines scanning parameters according to the scanning mode, the scanning unit is connected with the magnetic resonance control unit, the magnetic resonance control unit controls the scanning unit to adjust a main magnetic field according to the scanning parameters and controls the scanning unit to scan the person to be detected with the main magnetic field according to the scanning parameters, the scanning unit generates scanning data, and the magnetic resonance control unit performs image reconstruction on the scanning data to obtain a scanning image. The individual difference of the person to be detected and the person to be detected with different physiological characteristics are considered, the main magnetic field is adjusted according to the scanning parameters corresponding to different scanning modes and scanning parameters, and therefore the imaging effect of the magnetic resonance system is improved.
Description
The present application is a divisional application with an application number of 2020101267566, which is filed on 28.02/2020 of 2020, entitled magnetic resonance system and a control method thereof.
Technical Field
The present application relates to the field of magnetic resonance technology, and in particular, to a magnetic resonance system.
Background
The magnetic resonance imaging is a medical imaging diagnosis technology which mainly utilizes the nuclear magnetic resonance phenomenon of certain atomic nucleus in human tissue, processes the obtained radio frequency signal by a computer and reconstructs a certain layer of human body. The imaging technology has multiple functions, multiple parameters, multiple planes and higher soft tissue resolution, and is widely applied to diagnosis of diseases.
According to the MRI imaging principle, in addition to a steady main magnetic field, a gradient field and a corresponding radio frequency transmitting coil are matched at the same time, and the magnetic field and the radio frequency field meet the Raymond equation, so that the nuclei of the scanned tissue are excited to generate resonance with specific frequency, signals are transmitted, and the signals are received by a receiving coil with a specific frequency band and finally processed into images.
Theoretically, a stronger main magnetic field can produce stronger tissue magnetization, which in turn produces stronger signals and high contrast images. Under ultrahigh field strength, the increase of chemical shift, the enhancement of Blood Oxygen Level Dependence (BOLD), the change of relaxation time and the increase of magnetic sensitivity effect in organisms make the application of the ultrahigh field magnetic resonance imaging technology in nuclear magnetic resonance spectroscopy, BOLD functional magnetic resonance imaging, chemical Exchange Saturation Transfer (CEST), magnetic Sensitivity Weighted Imaging (SWI) and quantitative magnetic sensitivity imaging (QSM) have inherent advantages. However, in practice, the image contrast is worse because the relaxation process of the tissue magnetization changes significantly with increasing magnetic field, making the magnetic resonance signals at many high fields more difficult to process. How to improve the imaging effect of the magnetic resonance system is an urgent problem to be solved.
Disclosure of Invention
In view of the above, it is necessary to provide a magnetic resonance system and a control method thereof for improving the imaging effect of the magnetic resonance system.
A method of controlling a magnetic resonance system, comprising:
s100, selecting a scanning mode according to the physiological characteristic parameters of the person to be detected.
And S200, determining scanning parameters according to the scanning mode.
S300, scanning the person to be detected according to the scanning parameters to obtain scanning data.
S400, carrying out image reconstruction on the scanning data to obtain a scanning image.
In one embodiment, the physiological characteristic parameter comprises one or more of age, height, weight, scan location, or physiological index parameter.
In one embodiment, the scan parameters include system scan parameters and sequence scan parameters. The system scanning parameters include one or more of main magnetic field strength, position of the scanning bed, inter-magnet temperature of the magnetic resonance system, and inter-magnet humidity of the magnetic resonance system. The sequence scan parameters include one or more of radio frequency pulse parameters, gradient field parameters, or signal acquisition instants. The radio frequency pulse parameters include one or more of a bandwidth of the radio frequency pulse, an intensity of the radio frequency pulse, an application time of the radio frequency pulse, or a duration of the radio frequency pulse. The gradient field parameters comprise one or several of a gradient field application direction, a gradient field strength, a gradient field application time or a gradient field duration.
In one embodiment, S100 includes:
and S110, determining one or more of a specific absorption rate threshold, a peripheral nerve stimulation threshold, a scanning time threshold or a sound tolerance threshold which can be borne by the person to be detected according to the physiological parameters.
S120, determining the scanning mode according to one or more of the specific absorption rate threshold, the peripheral nerve stimulation threshold, the scanning time threshold or the sound tolerance threshold.
In one embodiment, the scan mode includes a combination of one or more of a low-field scan mode, a mid-field scan mode, a high-field scan mode, or an ultra-high-field scan mode.
In one embodiment, the scan pattern includes a plurality of scan phases. The multiple scanning stages adopt one or more of a low-field scanning mode, a medium-field scanning mode, a high-field scanning mode or an ultrahigh-field scanning mode.
In one embodiment, before S100, the method further includes:
and S010, acquiring a plurality of physiological characteristic parameters, a plurality of scanning modes and a plurality of scanning parameters, establishing a corresponding relation between the plurality of physiological characteristic parameters and the plurality of scanning modes, and establishing a corresponding relation between the plurality of scanning modes and the plurality of scanning parameters.
A magnetic resonance system includes an intelligent detection device, a magnetic resonance control unit, and a scanning unit. The intelligent detection device is used for carrying out physiological detection on a person to be detected and obtaining physiological characteristic parameters. The intelligent detection device is connected with the magnetic resonance control unit. The magnetic resonance control unit acquires the physiological characteristic parameters. And the intelligent detection device selects a scanning mode according to the physiological characteristic parameters. The magnetic resonance control unit determines scan parameters according to the scan pattern. The scanning unit is connected with the magnetic resonance control unit. And the magnetic resonance control unit controls the scanning unit to scan the person to be detected according to the scanning parameters. The scanning unit generates scanning data. And the magnetic resonance control unit carries out image reconstruction on the scanning data to obtain a scanning image.
In one embodiment, the scanning unit comprises a power supply module, a magnetic field adjustment unit, a magnet component, a gradient component, and a radio frequency component.
The power supply module is connected with the magnetic resonance control unit. And the magnetic resonance control unit controls the power supply module to generate a first driving current, a second driving current and a third driving current according to the scanning parameters.
The magnetic field adjusting unit is connected with the power supply module and the magnetic resonance control unit. And the magnetic resonance control unit controls the magnetic field adjusting unit to adjust the first driving current according to the scanning parameters to obtain a fourth driving current.
The magnet member is connected to the magnetic field adjusting unit. The magnet assembly receives the fourth drive current and generates a primary magnetic field.
The gradient component is connected with the power supply module. The gradient component receives the second driving current and generates a gradient magnetic field.
The radio frequency component is connected with the power supply module. The radio frequency part receives the third driving current and transmits radio frequency pulses. In one embodiment, the magnetic resonance control unit further comprises a display control module.
The display control module is used for displaying a plurality of scanning modes and receiving an external instruction. In one embodiment, the physiological characteristic parameter includes one or more of age, scan location, or physiological index parameter.
In one embodiment, the magnetic field adjusting unit includes: a field raising unit and a field lowering unit.
The power module, the magnet component and the magnetic resonance control unit are respectively connected with the field rising unit. And when the intensity of the background magnetic field needs to be increased, the field increasing unit increases the first driving current according to the control signal to obtain the fourth driving current. The field increasing unit outputs the fourth drive current to the magnet member.
The field descending unit is connected with the field ascending unit in parallel. The power module, the magnet component and the magnetic resonance control unit are respectively connected with the field reducing unit. When the intensity of the background magnetic field needs to be reduced, the field increasing unit reduces the first driving current according to the control signal to obtain the fourth driving current. The field increasing unit outputs the fourth drive current to the magnet member.
In one embodiment, the magnetic resonance system further comprises a bed. The bed body is connected with the magnetic resonance control unit. The magnetic resonance control unit controls the bed body to drag the person to be detected to move in the background magnetic field area.
The magnetic resonance system provided by the embodiment of the application comprises a scanning mode selected according to the physiological characteristic parameters of a person to be detected. And determining scanning parameters according to the scanning mode. And scanning the person to be detected according to the scanning parameters to obtain scanning data. And carrying out image reconstruction on the scanning data to obtain a scanning image. The magnetic resonance system considers the individual difference of the person to be detected and the person to be detected with different physiological characteristics, and is suitable for scanning in different scanning modes. Different scanning modes correspond to different scanning parameter settings so as to improve the final imaging effect of the magnetic resonance system.
Drawings
Fig. 1 is a flow chart of a control method of the magnetic resonance system provided in an embodiment of the present application;
figure 2 is a graph of the relationship of parameters in the magnetic resonance system as provided in an embodiment of the present application;
figure 3 is a block diagram of the magnetic resonance system provided in one embodiment of the present application;
fig. 4 is a schematic structural diagram of the magnetic resonance system provided in an embodiment of the present application.
Reference numerals:
Magnetic resonance control unit 30
Magnetic field adjusting unit 420
Field-raising unit 421
Transmitting unit 451
Receiving unit 452
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and those skilled in the art will recognize that many modifications may be made without departing from the spirit and scope of the present application and that the present application is not limited to the specific implementations disclosed below.
The numbering of the components as such, e.g., "first", "second", etc., is used herein for the purpose of describing the objects only, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 and fig. 2, an embodiment of the present application provides a method for controlling a magnetic resonance system, including:
s100, selecting a scanning mode according to the physiological characteristic parameters of the person to be detected.
And S200, determining scanning parameters according to the scanning mode.
S300, scanning the person to be detected according to the scanning parameters to obtain scanning data.
S400, carrying out image reconstruction on the scanning data to obtain a scanning image.
Theoretically, the higher the strength of the main magnetic field, the stronger the tissue magnetization, and thus the stronger the signal and high contrast image. However, in practice, the image contrast is worse because the relaxation process of the tissue magnetization changes significantly with increasing magnetic field, making the magnetic resonance signals at many high fields more difficult to process. Therefore, the final imaging effect of the magnetic resonance system can be improved by selecting different scanning modes according to different relaxation characteristics of tissue magnetization.
In one embodiment, the physiological characteristic parameter comprises one or more of age, height, weight, scan location, or physiological index parameter. Through physiological characteristic parameters, the detected persons can be divided into: sensitive people and non-sensitive people. The sensitive population may include, for example, infants, elderly people, critically ill patients, and the like.
In one embodiment, the scan parameters include system scan parameters and sequence scan parameters. The system scanning parameters can be, for example, the main magnetic field strength, the position of the scanning bed, the inter-magnet temperature and humidity of the magnetic resonance system, the temperature of a gradient coil in the current magnetic resonance system, the temperature of a radio frequency receiving coil, and the like. The sequence scan parameters may include radio frequency pulse parameters, gradient field parameters, and signal acquisition instants. The radio frequency pulse parameters may be, for example, the bandwidth, intensity, application time and duration of the radio frequency pulse, etc. The gradient field parameters may be, for example, the gradient field application direction, the gradient field strength, the application time instant and the duration.
In one embodiment, S100 includes:
and S110, determining one or more of a specific absorption rate threshold, a peripheral nerve stimulation threshold, a scanning time threshold or a sound tolerance threshold which can be borne by the person to be detected according to the physiological parameters.
S120, determining the scanning mode according to one or more of the specific absorption rate threshold, the peripheral nerve stimulation threshold, the scanning time threshold or the sound tolerance threshold.
The Specific Absorption Rate (SAR) threshold, the Peripheral Nerve Stimulation (PNS) threshold, the scanning time threshold, the sound tolerance threshold, etc. which can be borne by the person to be detected can be determined by a table look-up method through physiological parameters. The SAR threshold is related to the radio frequency energy absorbed by the subject to be examined per unit mass per unit time and is proportional to the square of the main magnetic field strength. The PNS threshold is used to measure the stimulation of the nerve endings of the human body caused by the rapid switching of the gradient field of the gradient coil. The sound tolerance threshold is used for representing the sound decibel that a person to be detected can bear when the person to be detected is in the scanning cavity, and the sound decibel source of the scanning cavity is mainly related to the switching of the gradient field. For example, noise generated when the gradient field is switched is transmitted through air and solid (such as a scan frame and a scan bed of a magnetic resonance system), and then the noise is transmitted into ears of a patient; when the noise source generates noise, it also causes vibration of the components of the housing, thereby generating sound, which also enters the ear.
In one embodiment, the scan mode includes a combination of one or more of a low-field scan mode, a mid-field scan mode, a high-field scan mode, or an ultra-high-field scan mode. Illustratively, the strength of the main magnetic field for the low-field scan mode is set to 0.5T (tesla) and below. The strength of the main magnetic field corresponding to the midfield scanning mode is set to any value between 0.5T and 1.5T. The strength of the main magnetic field corresponding to the high-field scanning mode is set to any value between 3.0T and 5.0T. The strength of the main magnetic field corresponding to the ultra-high field scanning mode is set to be greater than 5.0T. For example the strength of the main magnetic field is set to 7.0T, 9.4T or higher.
The scan pattern can also be divided according to the decibels of sound in the space between the magnets (where the magnetic resonance system is located): a silent mode, a standard mode, etc. Illustratively, the decibel of sound within the corresponding scan interval in the mute mode is less than 60 decibels, e.g., 50-60 decibels. The decibel of sound within the corresponding scan interval in the standard mode is greater than 60 decibels. Accordingly, in the mute mode, a mute sequence is triggered to change the switching rate, the climbing rate, etc. of the gradient.
In one embodiment, the subject is an infant. Infants are sensitive to noise. Generally, the noise of the magnetic resonance system with high magnetic field is larger than that of the magnetic resonance system with low magnetic field, so that the absorbed radio frequency energy is more in the detection process, and the baby can not complete the examination in the magnetic resonance system with ultrahigh magnetic field. Therefore, in the case of a baby examination, a magnetic resonance system with a non-ultrahigh magnetic field is selected to perform the detection. In this embodiment, a sound tolerance threshold may be determined according to the physiological characteristic parameter of the person to be detected, and the scanning parameter in the low-field or medium-high-field scanning mode may be determined according to the SAR threshold and/or the PNS threshold.
In one embodiment, the scanning part is a part such as a nerve or a blood vessel which needs high-definition images, and if the imaging result has the requirements of high sensitivity and high signal to noise ratio, a high-field or ultrahigh-field scanning mode is selected. In this embodiment, the PNS threshold may be determined according to the physiological characteristic parameter of the person to be detected, and the gradient pulse parameter in the high-field or ultra-high-field scanning mode may be determined according to the PNS threshold.
In one embodiment, the person to be detected is a non-sensitive person, the scanning part is a head, and an image with a high signal-to-noise ratio is required to be obtained for evaluating whether the person to be detected has a stroke. In this embodiment, the SAR threshold and/or the PNS threshold may be determined according to the physiological characteristic parameter of the person to be detected; determining a scanning mode as a middle and low field scanning mode executed in a first stage according to the SAR threshold and/or the PNS threshold, wherein the scanning field range in the first stage is a scanning part; and in the second stage, a high-field or ultrahigh-field scanning mode is executed, and the scanning field range in the second stage is a local interested area in the scanning part. In the embodiment of the application, firstly, global imaging is carried out on a scanning part in a non-high-field scanning mode, and a local region of interest can be determined through a global imaging result; high-field or ultrahigh-field scanning is carried out on the local region of interest, and on the premise of ensuring that the scanning does not exceed the SAR threshold value and/or the PNS threshold value, the accuracy of the scanning result of the region of interest is improved. In addition, high-field or ultrahigh-field scanning is carried out on the local region of interest, so that the scanning time can be saved, and the rapid determination of fine focuses is facilitated.
In one embodiment, the scan mode includes a combination of one or more of a low-field scan mode, a mid-field scan mode, a high-field scan mode, or an ultra-high-field scan mode.
In one embodiment, the scan pattern includes a plurality of scan phases. The multiple scanning stages adopt one or more of a low-field scanning mode, a medium-field scanning mode, a high-field scanning mode or an ultrahigh-field scanning mode.
In one embodiment, the subject is a sensitive person, and the scanning part is a head to obtain local pathological changes of the brain. A scan time threshold may be determined based on a physiological characteristic parameter of the subject, and based on the scan time threshold, it may be determined that one nucleus is imaged with a first main magnetic field strength (e.g., low-field scan mode or mid-field scan mode) during a first phase and a second nucleus is imaged with a second main magnetic field strength (e.g., high-field scan mode or ultra-high field scan mode) during a second phase. In this example, a first stage images hydrogen atoms with a main magnetic field of 1.5T strength; and in the second stage, a main magnetic field with the strength of 7.0T is adopted to image sodium atoms and oxygen atoms, and the vitality of the tissues or the pathological changes of the interested area are evaluated according to the reconstructed images of the two atoms. The control method of the magnetic resonance system provided by the embodiment of the application fully considers the individual difference of the person to be detected and the person to be detected with different physiological characteristics, and is suitable for scanning in different scanning modes. Different scanning modes correspond to different scanning parameter settings so as to improve the final imaging effect of the magnetic resonance system.
In one embodiment, before S100, the method for controlling a magnetic resonance system further includes:
s010, acquiring a plurality of physiological characteristic parameters, a plurality of scanning modes and a plurality of scanning parameters, establishing a first corresponding relation between the plurality of physiological characteristic parameters and the plurality of scanning modes, and establishing a second corresponding relation between the plurality of scanning modes and the plurality of scanning parameters.
In one embodiment, different age groups of the person to be detected correspond to different scanning modes. Different scanning positions correspond to different scanning modes. Different physiological index parameters correspond to different scanning modes.
Each of the scan modes includes a main magnetic field strength and sequential scan parameters. The magnetic field intensity and the sequence scanning parameters corresponding to different scanning modes are respectively different.
In one embodiment, before S010, the method of controlling the magnetic resonance system further includes:
and S020, detecting the person to be detected to obtain the physiological characteristic parameters of the person to be detected.
In one embodiment, the S100 alternatives are: and receiving an external control instruction, and selecting the scanning mode according to the control instruction.
In one embodiment, after S010, the control method of the magnetic resonance system further comprises evaluating the quality of the scan image, generating a feedback factor; and adjusting the scanning parameters according to the feedback factors, and carrying out scanning again according to the scanning parameters. Optionally, the evaluating the quality of the scan image may specifically be evaluating the contrast, signal-to-noise ratio, whether an artifact exists, whether a clinical requirement is met, and the like of the scan image. Adjusting the scan parameters based on the feedback factors may be, for example, increasing the field strength of the main magnetic field, increasing the gradient climb rate, changing the sequence type, adjusting the scan region, etc.
Referring to fig. 3 and 4 together, an embodiment of the present application provides a magnetic resonance system 10 including an intelligent detection apparatus 20, a magnetic resonance control unit 30, and a scanning unit 40. The intelligent detection device 20 is used for physiological detection of a person to be detected and obtaining physiological characteristic parameters. The intelligent detection device 20 is connected to the magnetic resonance control unit 30. The magnetic resonance control unit 30 acquires the physiological characteristic parameters. The magnetic resonance control unit 30 selects a scanning mode in dependence on the physiological characteristic parameter. The magnetic resonance control unit 30 determines the scan parameters according to the scan pattern. The scanning unit 40 is connected to the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the scanning unit 40 to scan the subject according to the scanning parameters. The scanning unit 40 generates scan data. The magnetic resonance control unit 30 performs image reconstruction on the scan data to obtain a scan image.
In the magnetic resonance system 10 provided in the embodiment of the present application, the intelligent detection device 20 performs physiological detection on a person to be detected, and obtains a physiological characteristic parameter. The magnetic resonance control unit 30 selects a scanning mode according to the physiological characteristic parameters, determines scanning parameters according to the scanning mode, and controls the scanning unit 40 to scan the subject to be detected according to the scanning parameters. The magnetic resonance system 10 fully considers the individual difference of the person to be detected, and the person to be detected with different physiological characteristics is suitable for scanning in different scanning modes. Different scanning modes correspond to different scanning parameter settings so as to improve the final imaging effect of the magnetic resonance system.
The magnetic resonance system 10 provided by the embodiment of the present application performs scanning imaging with different scanning modes, i.e., different magnetic fields and different frequencies. For the magnetic resonance imaging scanning of certain specific parts, the most appropriate field intensity mode can be selected according to the tissue relaxation characteristics to obtain the optimal image. For certain populations, such as infants, a scan mode that is physically acceptable, such as a low-field, low-noise mode, can be selected to yield an image with an acceptable signal-to-noise ratio. For ordinary scanning, the most common and most economical low-field scanning mode can be selected, the system cost is saved, and the scanning environment is improved.
In one embodiment, the magnetic resonance control unit 30 evaluates the quality of the scan images, generating feedback factors; and adjusting the scanning parameters according to the feedback factors, and carrying out scanning again according to the scanning parameters. Optionally, the evaluating the quality of the scan image may specifically be evaluating the contrast, signal-to-noise ratio, whether an artifact exists, whether a clinical requirement is met, and the like of the scan image. The magnetic resonance control unit 30 feeds back the feedback factor to the scanning unit 40, and the scanning unit 40 adjusts the scanning parameter according to the feedback factor, for example, the main magnetic field strength is increased, the gradient climbing rate is increased, the sequence type is changed, the scanning area is adjusted, and the like.
In one embodiment, the smart detection device 20 includes, but is not limited to, a camera, a motion monitoring device, a physiological monitoring device, and the like.
In one embodiment, the magnetic resonance control unit 30 comprises a magnetic resonance spectrometer and a processor.
In one embodiment, the scanning unit 40 includes a power module 410, a magnetic field adjustment unit 420, a magnet assembly 430, a gradient assembly 440, and a radio frequency assembly 450.
The power module 410 may include a magnet power supply, a gradient power amplifier, and a radio frequency power amplifier. The magnet power supply of the power module 410 is connected to the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the magnet power supply of the power supply module 410 to generate a first driving current, controls the gradient power amplifier of the power supply module 410 to generate a second driving current, and controls the rf power amplifier of the power supply module 410 to generate a third driving current according to the scan parameter.
The magnetic field adjusting unit 420 is connected to the power module 410 and the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the magnet power supply of the magnetic field adjusting unit 420 to adjust the first driving current according to the scanning parameter, so as to obtain a fourth driving current.
The magnet part 430 is connected to the magnetic field adjusting unit 420. The magnet assembly 430 receives the fourth drive current and generates a primary magnetic field.
The gradient component 440 is connected to a gradient power amplifier of the power module 410. The gradient unit 440 receives the second driving current and generates a gradient magnetic field for radio frequency excitation of the selected layer.
The radio frequency components 450 include a radio frequency receive coil and a radio frequency transmit coil. The radio frequency transmitting coil of the radio frequency part 450 is connected with the radio frequency power amplifier of the power supply module 410. The radio frequency transmit coil of the radio frequency part 450 receives the third drive current and generates a radio frequency pulse for exciting nuclear spins in the subject. The radio frequency receiving coil of the radio frequency part 450 receives a magnetization signal generated by nuclear spins in the subject, and obtains the scan data. Of course, the scan data is obtained by analog-to-digital conversion of the magnetization signal and processed into a digital matrix. The magnetic resonance control unit 30 is connected to the radio frequency receive coils of the radio frequency part 450. The magnetic resonance control unit 30 performs fourier transform on the signals subjected to analog-to-digital conversion, denoising, and gradient encoding to obtain the scan image.
The magnet assembly 430 may be a conventional immersion type low temperature superconducting magnet, or a conduction cooling type high temperature superconducting magnet, or other magnet assembly with controllable field strength. The strength of the main magnetic field generated by the magnet assembly 430 can be determined by varying the magnitude of the current flowing therethrough.
In one embodiment, the magnet component 430 is a superconducting magnet. The highest magnetic field of a superconducting magnet is generally determined by the highest designed operating current. In practice, however, the magnet will operate well below the maximum operating current. The current input to the magnet part 430 performs a lifting operation using the magnetic field adjusting unit 420. The magnetic field adjusting unit 420 is an independent excitation power supply to adjust the first driving current to obtain a fourth driving current. And the superconducting magnet receives the fourth driving current and generates a main magnetic field, so that the operation of lifting the field is realized.
In one embodiment, the magnet assembly 430 is a superconducting magnet with coils designed for a maximum current of I 0 Corresponding field strength of the central zone of B 0 Which may be below I 0 Normal scan at any current. The magnetic field adjusting unit 420 is electrically connected to the magnet part 430, and adjusts the scanning current, such as I, of the magnet part 430 in real time 0 /2，I 0 And/4, etc., further changing the magnetic field strength to B 0 /2，B 0 /4, i.e. the magnet has a multistage central field strength B i . Generally, the superconducting magnet field is adjusted by the field adjustment unit 420, such as 1.5T to 3.0T for about 10 minutes to 60 minutesThe temperature is reduced from 3.0T to 1.5T, and the time is about 10 minutes to 30 minutes.
In one embodiment, the magnetic field adjusting unit 420 includes a rising field unit 421 and a falling field unit 422.
The power module 410, the magnet part 430 and the magnetic resonance control unit 30 are respectively connected to the field-increasing unit 421. When the strength of the main magnetic field needs to be increased, the field increasing unit 421 increases the first driving current according to the control signal, so as to obtain the fourth driving current. The field increasing unit 421 outputs the fourth driving current to the magnet part 430.
The field-decreasing unit 422 is connected in parallel with the field-increasing unit 421. The power module 410, the magnet assembly 430 and the magnetic resonance control unit 30 are respectively connected to the field reducing unit 422. When the strength of the main magnetic field needs to be reduced, the field increasing unit 421 reduces the first driving current according to the control signal, so as to obtain the fourth driving current. The field increasing unit 421 outputs the fourth driving current to the magnet part 430.
In one embodiment, the excitation power supply is disconnected after the ramp-up is completed. When the field needs to be reduced, the excitation power supply is connected to the superconducting magnet, and the excitation power supply is operated to reduce the field.
In one embodiment, the radio frequency part 450 comprises a transmitting unit 451 and a receiving unit 452.
The transmitting unit 451 is connected to the power module 410. The transmitting unit 451 receives the third driving current and transmits a radio frequency pulse. The receiving unit 452 receives the tissue magnetization signal to obtain the scan data. The magnetic field adjusting unit 420 and the receiving unit 452. The magnetic field adjusting unit 420 collects the scan data and directly evaluates the scan data, and the magnetic field adjusting unit 420 changes the current of the excitation power supply according to the evaluation result.
The transmitting unit 451 has at least 2 or more stages of bandwidth of RF signal transmitting capability, such as a frequency band centered at fr 0 、fr 1 Or fr 2 And the like. Accordingly, the receiving unit 32 is provided withWider signal reception, or signal reception capability in at least 2 or more frequency bands, e.g. reception band centered at fb 0 、fb 1 Or fb 2 And so on.
The multilevel central field intensity of the magnet and the multilevel radio frequency emission frequency need to be matched for system imaging, namely, the Larmor equation is satisfied:
wherein upsilon/2 pi represents a magnetic rotation ratio, f ri For receiving the centre frequency of the band, B i The field strength in the central region.
In one embodiment, the transmitting unit 451 and the receiving unit 452 may be separate, integrated, or partially functionally coincident.
In one embodiment, the magnetic field adjusting unit 420 and the power module 410 may be separate bodies, may be integrated, or may partially overlap in function, or may even be a sub-component of the magnetic resonance control unit 30.
In one embodiment, the magnetic resonance control unit 30 includes a storage module 310, a data processing module 320, a signal transceiver module 330, and an image processing module 340.
The storage module 310 is configured to store a plurality of physiological characteristic parameters, a plurality of scanning modes, and a plurality of scanning parameters. A first corresponding relation is formed between a plurality of physiological characteristic parameters and a plurality of scanning modes. And forming a second corresponding relation between a plurality of scanning modes and a plurality of scanning parameters. The scan parameters include magnetic field strength, radio frequency component frequency band, scan sequence, and gradient parameters.
The smart detection device 20 and the storage module 310 are respectively connected to the data processing module 320. The data processing module 320 collects the physiological characteristic parameters and selects the scanning mode according to the physiological characteristic parameters and the first corresponding relationship. The data processing module 320 determines the scanning parameters according to the scanning mode and the second corresponding relationship. The data processing module 320 obtains a first driving signal and an adjusting signal according to the magnetic field strength. The data processing module 320 obtains a second driving signal according to the gradient parameter and the scan sequence. The data processing module 320 obtains a third driving signal according to the rf component frequency band and the scan sequence.
The power module 410, the magnetic field adjusting unit 420 and the radio frequency part 450 are respectively connected to the signal transceiver module 330. The signal transceiver module 330 outputs the first driving signal, the second driving signal and the third driving signal to the power module 410. The power module 410 outputs the first driving current, the second driving current, and the third driving current. The signal transceiver module 330 outputs the adjustment signal to the magnetic field adjustment unit 420. The magnetic field adjusting unit 420 adjusts the first driving current according to the adjustment signal to obtain a fourth driving current. The signal transceiver module 330 receives the scan data.
The image processing module 340 is connected to the signal transceiver module 330. The image processing module 340 performs image reconstruction on the scan data to obtain the scan image. The image reconstruction process of the image processing module 340 is typically synchronized with the scanning process, i.e. the image reconstruction is in real time.
In one embodiment, the magnetic resonance control unit 30 further comprises a display control module 350. The display control module 350 is configured to display a plurality of the scanning modes and receive an external instruction. The display control module 350 is connected to the data processing module 320. The data processing module 320 selects the scan mode according to the control instruction.
In one embodiment, the display control module 350 further comprises an interface for manually inputting the physiological characteristic parameter, the scan mode, or manual selection.
In one embodiment, the display control module 350 includes, but is not limited to, a host software control interface, a hardware input control interface, an emergency start stop switch, and the like.
In one embodiment, the physiological characteristic parameter includes one or more of age, scan location, or physiological index parameter.
In one embodiment, the magnetic resonance system 10 further comprises a bed 50. The bed 50 is connected to the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the bed 50 to drag the person to be detected to move in the main magnetic field area.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-described examples merely represent several embodiments of the present application and are not to be construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A magnetic resonance system, comprising:
the intelligent detection device (20) is used for carrying out physiological detection on a person to be detected and obtaining physiological characteristic parameters;
the magnetic resonance control unit (30), the intelligent detection device (20) is connected with the magnetic resonance control unit (30), the magnetic resonance control unit (30) is used for acquiring the physiological characteristic parameters and selecting a scanning mode according to the physiological characteristic parameters, and the magnetic resonance control unit (30) determines the scanning parameters according to the scanning mode; and
the magnetic resonance control unit (40) is connected with the magnetic resonance control unit (30), the magnetic resonance control unit (30) is used for controlling the scanning unit (40) to adjust a main magnetic field according to the scanning parameters, the scanning unit (40) is controlled according to the scanning parameters to scan the person to be detected through the main magnetic field, the scanning unit (40) generates scanning data, and the magnetic resonance control unit (30) is used for carrying out image reconstruction on the scanning data to obtain a scanning image.
2. The magnetic resonance system of claim 1, wherein the magnetic resonance control unit (30) is configured to evaluate a quality of the scan image, to generate a feedback factor, and to adjust the scan parameter in accordance with the feedback factor.
3. The magnetic resonance system as set forth in claim 1, wherein the scanning unit (40) includes:
the power supply module (410) is connected with the magnetic resonance control unit (30), and the magnetic resonance control unit (30) is used for controlling the power supply module (410) to generate a first driving current, a second driving current and a third driving current according to the scanning parameters;
the magnetic field adjusting unit (420) is connected with the power supply module (410) and the magnetic resonance control unit (30), and the magnetic resonance control unit (30) is used for controlling the magnetic field adjusting unit (420) to adjust the first driving current according to the scanning parameters to obtain a fourth driving current;
a magnet part (430) connected to the magnetic field adjusting unit (420), the magnet part (430) receiving the fourth driving current and generating a main magnetic field;
a gradient component (440) connected to the power module (410), the gradient component (440) receiving the second driving current and generating a gradient magnetic field; and
and the radio frequency component (450) is connected with the power supply module (410), and the radio frequency component (450) is used for receiving the third driving current and transmitting a radio frequency pulse.
4. The magnetic resonance system as set forth in claim 3, wherein the magnetic field adjusting unit (420) includes:
a field increasing unit (421) connected to the power supply module (410), the magnet assembly (430) and the magnetic resonance control unit (30), wherein when the strength of the main magnetic field needs to be increased, the field increasing unit (421) increases the first driving current according to a control signal to obtain a fourth driving current, and the field increasing unit (421) outputs the fourth driving current to the magnet assembly (430);
and the field-reducing unit (422) is connected with the field-increasing unit (421) in parallel, the power supply module (410), the magnet part (430) and the magnetic resonance control unit (30) are respectively connected with the field-reducing unit (422), when the strength of the main magnetic field needs to be reduced, the field-increasing unit (421) reduces the first driving current according to the control signal to obtain the fourth driving current, and the field-increasing unit (421) outputs the fourth driving current to the magnet part (430).
5. The magnetic resonance system as set forth in claim 1, wherein the magnetic resonance control unit (30) includes:
a storage module (310) for storing a plurality of the physiological characteristic parameters, a plurality of scanning modes and a plurality of scanning parameters, wherein a first corresponding relationship is formed between the plurality of the physiological characteristic parameters and the plurality of the scanning modes, and a second corresponding relationship is formed between the plurality of the scanning modes and the plurality of the scanning parameters.
6. The magnetic resonance system as set forth in claim 5, wherein the magnetic resonance control unit (30) further includes:
the data processing module (320), the intelligent detection device (20) and the storage module (310) are respectively connected with the data processing module (320), the data processing module (320) is used for collecting the physiological characteristic parameters and determining the scanning mode according to the physiological characteristic parameters and the first corresponding relation, and the data processing module (320) is used for determining the scanning parameters according to the scanning mode and the second corresponding relation.
7. The magnetic resonance system according to claim 6, wherein the magnetic resonance control unit (30) further comprises a display control module (350), the display control module (350) is connected to the data processing module (320), the display control module (350) is configured to display a plurality of the scan modes and receive an external instruction, and the data processing module (320) selects the scan mode according to the control instruction.
8. The magnetic resonance system of claim 3, wherein the power supply module (410) includes a magnet power supply, a gradient power amplifier, and a radio frequency power amplifier, wherein:
the magnetic resonance control unit (30) is used for controlling the magnet power supply to generate the first driving current according to the scanning parameters, controlling the gradient power amplifier to generate the second driving current, and controlling the radio frequency power amplifier to generate the third driving current.
9. The magnetic resonance system of claim 1, wherein the scan mode includes a combination of one or more of a low-field scan mode, a mid-field scan mode, a high-field scan mode, or an ultra-high-field scan mode.
10. The magnetic resonance system of claim 1, wherein the scan parameters include system scan parameters and sequence scan parameters;
the system scanning parameters comprise main magnetic field strength, and the system scanning parameters further comprise one or more of position of a scanning bed, inter-magnet temperature of a magnetic resonance system, and inter-magnet humidity of the magnetic resonance system;
the sequence scanning parameters comprise one or more of radio frequency pulse parameters, gradient field parameters or signal acquisition time, the radio frequency pulse parameters comprise one or more of the bandwidth of a radio frequency pulse, the strength of the radio frequency pulse, the application time of the radio frequency pulse or the duration of the radio frequency pulse, and the gradient field parameters comprise one or more of the gradient field application direction, the gradient field strength, the gradient field application time or the gradient field duration.
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| CN1037664C (en) * | 1993-02-07 | 1998-03-11 | 内蒙古新优佳企业联合总公司 | Magnetic therapeutic method and magnetic field scanning type physiotherapy machine |
| JP5072250B2 (en) * | 2006-04-04 | 2012-11-14 | 株式会社東芝 | Magnetic resonance imaging system |
| WO2015057965A1 (en) * | 2013-10-16 | 2015-04-23 | ZBH Enterprises, LLC | Method and system for health plan management |
| US10509086B2 (en) * | 2015-06-12 | 2019-12-17 | Koninklijke Philips N.V. | Magnetic resonance fingerprinting dictionary generation using a supplementary magnetic field coil |
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| EP3446140A4 (en) * | 2017-06-29 | 2019-04-03 | Shanghai United Imaging Healthcare Co., Ltd. | System and method for magnetic resonance imaging acceleration |
| CN107669273B (en) * | 2017-11-07 | 2021-02-19 | 上海联影医疗科技股份有限公司 | Magnetic resonance equipment scanning system, scanning method and computer readable storage medium |
| CN109247940A (en) * | 2018-11-22 | 2019-01-22 | 上海联影医疗科技有限公司 | The scan method and magnetic resonance system of magnetic resonance system |
| CN110426662A (en) * | 2019-07-26 | 2019-11-08 | 上海联影医疗科技有限公司 | The scan control method and magnetic resonance imaging system of magnetic resonance imaging system |
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