CN108072770B - Anode target rotation frequency detection method, device and equipment - Google Patents
Anode target rotation frequency detection method, device and equipment Download PDFInfo
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Abstract
The embodiment of the invention discloses a method, a device and equipment for detecting the rotation frequency of an anode target, which reduce the detection cost of the rotation frequency of the anode target. Wherein the method comprises the following steps: acquiring a sampling signal output by an X-ray detector, wherein the sampling signal is a signal about the attenuation degree of X-rays in the period of executing CT scanning; converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal; and if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotating frequency of the anode target.
Description
Technical Field
The invention relates to the field of X-ray bulbs, in particular to a method, a device and equipment for detecting the rotation frequency of an anode target.
Background
The X-ray tube is a vacuum diode operating at high voltage. Comprises two electrodes: one is a filament for emitting electrons as a cathode, and the other is a target for receiving electron bombardment as an anode. The power supply part of the X-ray bulb tube at least comprises a low-voltage power supply for heating the filament and a high-voltage power supply for applying high voltage to the two poles. When the filament is passed through sufficient current to cause it to produce a cloud of electrons, and sufficient voltage (in the order of kilovolts) is applied between the anode and cathode to cause the cloud of electrons to be drawn toward the anode. At this time, the electrons impact the anode target in a high-energy and high-speed state, the high-speed electrons reach the target surface, the motion is suddenly stopped, and a small part of the kinetic energy of the electrons is converted into radiation energy to form X rays.
The X-ray bulb tube can be divided into a fixed anode tube and a rotary anode tube, wherein the fixed anode tube means that an anode target in the X-ray bulb tube is in a static state in the working process; the rotating anode tube refers to the anode target in the X-ray tube which is in a high-speed rotating state in the working process. Because electrons impact on the rotating anode target at a high speed to generate higher heat, the rotating anode tube generates heat by the rotation of the anode target and radiates the heat outwards in real time to achieve the purpose of stronger heat dissipation, so that the heat capacity is higher than that of a fixed anode tube, and the application of the rotating anode tube is more common than that of the fixed anode tube.
However, the target surface of the anode target may be in a state of a pit, a crack, erosion, or the like by high-energy collision of electrons, and the rotation frequency of the anode target may be lowered. The reduction of the rotating frequency of the anode target can increase the temperature on the anode target surface, further aggravate the states of corrosion, cracking and the like of the anode target surface, possibly lead to the explosion of an X-ray bulb tube in serious conditions, and cause safety threat to surrounding people and equipment.
In order to prevent the above-mentioned situation, it is very critical to detect the rotational frequency of the anode target. In the prior art, a speed sensor is arranged inside an X-ray bulb tube to detect the rotating frequency of an anode target, but the scheme has a complex process and can greatly increase the cost of the X-ray bulb tube.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method, a device and equipment for detecting the rotation frequency of an anode target, which reduce the detection cost of the rotation frequency of the anode target.
The embodiment of the invention provides an anode target rotation frequency detection method, which comprises the following steps:
acquiring a sampling signal output by an X-ray detector, wherein the sampling signal is a signal about the attenuation degree of X-rays in the period of executing CT scanning;
converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
and if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotating frequency of the anode target.
Preferably, the rectification frequency and/or the gantry rotation frequency are not included in the preset frequency range.
Preferably, the acquiring the sampling signal output by the X-ray detector includes:
acquiring a sampling signal of a first channel and a sampling signal of a second channel of the X-ray detector, wherein the first channel and the second channel are positioned in different rows of channels, and one row of channels corresponds to one layer of scanning image;
the method further comprises the following steps:
normalizing the sampling signal of the first channel and the sampling signal of the second channel to obtain a processed signal, wherein the processed signal is a signal with rectification frequency eliminated;
the converting the sampled signal from the time domain to the frequency domain comprises:
converting the processed signal from a time domain to a frequency domain.
Preferably, the value corresponding to each time point of the processed signal is a ratio of the sampling signal of the first channel and the sampling signal of the second channel corresponding to the time point.
Preferably, the first channel and the second channel belong to two rows of channels farthest away respectively.
The embodiment of the invention also provides a device for detecting the rotation frequency of the anode target, which comprises:
the device comprises a sampling signal acquisition unit, a conversion unit and an identification unit;
the sampling signal acquisition unit is used for acquiring a sampling signal output by the X-ray detector, wherein the sampling signal is a signal related to the attenuation degree of the X-ray in the period of executing the CT scanning;
the conversion unit is used for converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
the identification unit is used for identifying the frequency as the rotation frequency of the anode target if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists.
Preferably, the rectification frequency and/or the gantry rotation frequency are not included in the preset frequency range.
Preferably, the sampling signal acquiring unit is specifically configured to:
acquiring a sampling signal of a first channel and a sampling signal of a second channel of the X-ray detector, wherein the first channel and the second channel are positioned in different rows of channels, and one row of channels corresponds to one layer of scanning image;
the device further comprises:
the processing unit is used for carrying out normalization processing on the sampling signal of the first channel and the sampling signal of the second channel to obtain a processed signal, and the processed signal is a signal for eliminating rectification frequency;
the conversion unit is specifically configured to convert the processed signal from a time domain to a frequency domain to obtain a frequency domain signal.
Preferably, the value corresponding to each time point of the processed signal is a ratio of the sampling signal of the first channel and the sampling signal of the second channel corresponding to the time point.
The embodiment of the invention also provides anode target rotation frequency detection equipment, which comprises:
a processor, a memory for storing the processor-executable instructions, and a display;
wherein the processor is configured to:
acquiring a sampling signal output by an X-ray detector, wherein the sampling signal is a signal about the attenuation degree of X-rays in the period of executing CT scanning;
converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
and if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotating frequency of the anode target.
The display is configured to:
displaying the rotation frequency of the anode target.
According to the method, a sampling signal output by an X-ray detector is obtained, the sampling signal is converted from a time domain to a frequency domain to obtain a frequency domain signal, and if the frequency domain signal exists in a preset frequency range and only has a frequency with a nonzero amplitude value, the frequency is identified as the rotation frequency of the anode target. Compared with the technical scheme that a sensor is added in an X-ray bulb tube to detect the selection frequency of the anode target in the prior art, the method for detecting the rotation frequency of the anode target provided by the embodiment does not need to add any hardware, the rotation frequency of the anode target can be obtained by processing and analyzing the sampling signal by utilizing the prior X-ray bulb tube, and the detection cost of the rotation frequency of the anode target is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart of a method for detecting a rotational frequency of an anode target according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a rotary anode tube according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an actual focus and an effective focus according to a first embodiment of the present invention;
FIG. 4 is a flowchart of a method for detecting a rotational frequency of an anode target according to a second embodiment of the present invention;
FIG. 5 is a side view of a second X-ray detector provided in accordance with the present invention;
FIG. 6 is a top view of a second embodiment of the present invention;
fig. 7 is a block diagram of an anode target rotation frequency detection apparatus according to a third embodiment of the present invention;
fig. 8 is a hardware architecture diagram of an anode target rotation frequency detection apparatus according to a third embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, the figure is a flowchart of a method for detecting a rotation frequency of an anode target according to an embodiment of the present invention.
The anode target rotation frequency detection method provided by the embodiment comprises the following steps:
step S101: sampling signals output by the X-ray detector are acquired, wherein the sampling signals are signals about the attenuation degree of the X-rays in the period of executing the CT scanning.
A CT (Computed Tomography) apparatus includes an X-ray Tomography device including an X-ray tube that generates X-rays and an X-ray Detector (Detector) that receives X-rays, and a computer system mainly including a data acquisition system, a central processing system, an operation table, and the like.
Wherein the X-ray detector is a device that converts X-ray energy into electrical signals that can be recorded. The X-ray which penetrates through a scanned object with a certain thickness is received, the X-ray is converted into visible light, the visible light is converted into an analog signal by a photoelectric converter, then the analog signal is sampled, and the analog signal obtained by sampling is converted into a digital signal by an analog-to-digital converter (A/D).
In the present embodiment, a sampling signal output by the X-ray detector is acquired, and the sampling signal is a signal regarding the degree of X-ray attenuation during the execution of the CT scan, and may be an analog signal or a digital signal. The degree of X-ray attenuation is related to the density of X-rays passing through a scanned object, the higher the density of the scanned object is, the higher the degree of X-ray attenuation is, the smaller the X-ray energy detected by the X-ray detector is, namely, the smaller the amplitude or value of a sampling signal is; the smaller the density of the scanned object, the lower the degree of X-ray attenuation, and the larger the X-ray energy detected by the X-ray detector, i.e. the larger the amplitude or value of the sampled signal.
Step S102: and converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal.
The sampling signal is a time-domain signal converted according to the X-ray received by the X-ray detector, so the sampling signal necessarily carries the information of the rotating frequency of the anode target in the X-ray bulb tube. In order to extract the anode target rotation frequency, the embodiment converts the sampling signal from the time domain to the frequency domain through fourier transform, so as to obtain a frequency domain signal. The frequency domain signal reflects the information of the sampling signal in the frequency domain, which includes the rotation frequency of the anode target of the X-ray tube.
Step S103: and if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotating frequency of the anode target.
Since the frequency domain information carried in the sampling signal includes the rotation frequency of the anode target, in order to obtain the rotation frequency of the anode target, a preset frequency range is predetermined in this embodiment, and if it is determined that only one frequency with a non-zero amplitude exists in the frequency domain signal within the preset frequency range, the frequency is identified as the rotation frequency of the anode target.
The following principles are described in detail.
Each anode target has a specific rotation frequency in the initial stage, for example, 105Hz, but after a period of time, the rotation frequency of the anode target may decrease, so the lower limit of the preset frequency range should be lower than the specific rotation frequency, that is, lower than 105 Hz.. in addition, due to the anode target manufacturing process, the shape of the anode target is not a perfect circle, the frequency domain signal may include frequency doubling information of the anode target, for example, 2 times 105Hz, 3 times 105Hz, etc., and in order to avoid the frequency doubling information causing interference to the anode target rotation frequency determination, the upper limit of the preset frequency range should be lower than the frequency doubling frequencies, for example, lower than 210Hz (105Hz × 2).
The sampling signal may contain information on the commutation frequency and/or the gantry rotation frequency in addition to the anode target rotation frequency, and the predetermined frequency range may be excluded.
The rectifying frequency is generated in the process of converting alternating current into direct current by using a three-phase rectifying device, since the frequency of alternating current is generally 50Hz, if the alternating current is rectified by 6 times frequency, the alternating current and direct current are converted, and then the direct current voltage contains 300Hz (50Hz × 6) rectifying frequency information, the direct current voltage is inverted, boosted and rectified to generate a kilovolt high voltage for accelerating electrons, the kilovolt high voltage also carries 300Hz frequency information, after the electrons impact an anode target to generate X-rays, the X-rays also contain 300Hz frequency information, and the frequency information contained in the X-rays and generated by converting alternating current into direct current is called as rectifying frequency information, and since the rectifying frequency information is interference frequency information, the preset frequency range should not include the rectifying frequency information, and if the alternating current is rectified by three times frequency, the rectifying frequency is 50Hz × 3-150 Hz..
During a CT scan, the CT gantry (gantry) also rotates. The X-ray tube is carried on the rack, and when the rack rotates, a focus generated by the X-ray tube can shift due to the action of centrifugal force, so that frequency domain information of a sampling signal carries frequency information of rack rotation.
Then what is the focal spot produced by the X-ray tube? Referring to fig. 2, the figure is a schematic structural view of a rotary anode tube, in which the rotary anode tube includes a cathode and an anode, wherein the cathode includes a coiled filament, the anode is an anode target capable of rotating, and the rotary anode tube further includes a rotor for driving the anode target to rotate. Referring to fig. 3, in the figure, high-speed electrons generated by the filament of the cathode hit on the anode target of the anode, and an actual focal point is formed on the anode target, and the projection of the actual focal point on the X axis is called an effective focal point. In a coordinate system corresponding to the X axis, the Z axis is a bed entering direction, a plane formed by the X axis and the Y axis is a plane vertical to the Z axis, the X axis is a horizontal direction, and the Y axis is a vertical direction. Therefore, the focus generated by the X-ray tube comprises an actual focus and an effective focus, and during the rotation of the frame, the high-speed electrons are acted by centrifugal force, so that the actual focus of the anode target is shifted, the effective focus is shifted, and the X-ray is also shifted.
Typically, the gantry rotation frequency is very small, being only a few hertz. For example, when the gantry rotation period is 1S, the gantry rotation frequency is 1 Hz; when the rotation period of the rack is 2 seconds, the rotation frequency of the rack is 0.5 Hz; when the gantry rotation period is 0.5 seconds, the gantry rotation frequency is 2 Hz. But the preset frequency range should also be excluded in order not to let the rotational frequency information of the gantry interfere with the determination of the anode target rotational frequency.
According to the determination rule of the preset frequency range, the preset frequency range can be determined, for example, when the rectification frequency is 300Hz, the preset frequency range can be 10 Hz-200 Hz; when the rectification frequency is 150Hz, the preset frequency range may be 10Hz to 150 Hz.
In general, the amplitude corresponding to only one frequency in the preset frequency range is greater than zero, and the amplitudes corresponding to other frequencies are 0. Therefore, we identify the frequency with amplitude different from 0 as the rotation frequency of the anode target, which is the actual rotation frequency of the anode target. For example, assuming that the frequency of the amplitude other than 0 is 100Hz, the rotation frequency of the anode target is considered to be 100 Hz.
After the actual rotation frequency of the anode target is obtained, the difference between the actual rotation frequency and the ideal rotation frequency of the anode target can be calculated, if the difference exceeds a threshold value, the anode target is considered to be seriously damaged and should be replaced immediately, otherwise, a medical accident may be caused.
In this embodiment, a sampling signal output by an X-ray detector is obtained, the sampling signal is converted from a time domain to a frequency domain to obtain a frequency domain signal, and if the frequency domain signal exists in a preset frequency range and only has a frequency with a non-zero amplitude, the frequency is identified as the rotation frequency of the anode target. Compared with the technical scheme that a sensor is added in an X-ray bulb tube to detect the selection frequency of the anode target in the prior art, the method for detecting the rotation frequency of the anode target provided by the embodiment does not need to add any hardware, the rotation frequency of the anode target can be obtained by processing and analyzing the sampling signal by utilizing the prior X-ray bulb tube, and the detection cost of the rotation frequency of the anode target is effectively reduced.
Example two
The present embodiment is different from the first embodiment in that, in the first embodiment, the information about the rectification frequency in the sampling signal is excluded by the preset frequency range when the sampling signal is a frequency domain signal, and in the present embodiment, the exclusion may be performed when the sampling signal is a time domain signal.
Referring to fig. 4, it is a flowchart of a method for detecting a rotation frequency of an anode target according to a second embodiment of the present invention.
The anode target rotation frequency detection method provided by the embodiment comprises the following steps:
step S201: acquiring a sampling signal of a first channel and a sampling signal of a second channel of the X-ray detector, wherein the first channel and the second channel are positioned in different rows.
Step S202: and carrying out normalization processing on the sampling signal of the first channel and the sampling signal of the second channel to obtain a processed signal.
In the conventional CT apparatus, the X-ray detector has only a single row of detector units, and only one layer of scanned image is obtained by one rotation of the gantry. In the versions after the third and later CT generations, the X-ray detector is provided with a plurality of rows of detector units, the more the rows of the detector units are, the wider the width of the X-ray detector is, and a multi-layer scanning image can be obtained by rotating the rack for one circle, so that the scanning efficiency is effectively improved.
In case the X-ray detector has a plurality of rows of detector units, it is possible to have a plurality of rows of channels, one row of channels corresponding to one layer of the scanned image. The channels and the detector units may be in a one-to-one relationship or in a one-to-many relationship. The sampling signals output by each channel are used for calculating the pixel values of corresponding pixels in the scanned image.
Because the sampling signals output by each channel carry the same rectification frequency information, any two channels, referred to as a first channel and a second channel in this embodiment, may be selected, and the sampling signals of the first channel and the second channel are normalized to eliminate the rectification frequency information. The normalization processing may be performed in various ways, for example, a value corresponding to each time point of the processed signal is a ratio of the sampling signal of the first channel and the sampling signal of the second channel corresponding to the time point, that is, the sampling signal of the first channel and the sampling signal of the second channel are divided, and the obtained processed signal can eliminate the rectification frequency information.
However, if the first channel and the second channel are in the same row, the rectification frequency information is eliminated and the rotation frequency information of the anode target is also eliminated by the normalization process. In order to preserve the rotational frequency information of the anode target, the first channels and the second channels must be distributed in different rows. The closer the distance between the row where the first channel is located and the row where the second channel is located, the smaller the amplitude of the obtained rotation frequency of the anode target is; the farther the distance between the row of the first channel and the row of the second channel is, the larger the amplitude of the obtained rotation frequency of the anode target is. In order that the rotational frequency of the anode target can be accurately identified, the first channel and the second channel may preferably belong to two rows of channels that are farthest apart.
Referring to fig. 5 and 6, fig. 5 is a side view of the X-ray detector, and fig. 6 is a top view of the X-ray detector. In fig. 6, a small square represents a channel, with rows in the horizontal direction and columns in the vertical direction. The side view in fig. 5 shows a schematic view of a row of channels. Wherein the first channel is in a first row; the second channel is located in the last row.
It should be noted that the gantry rotation frequency information cannot be eliminated by the normalization process, and can only be eliminated by the preset frequency domain range, because the gantry offset causes the effective focal point to be offset on the Z-axis, which is reflected in the X-ray detector, that is, the gantry rotation frequency information between the row channels is different, and the first channel and the second channel are located in different rows, so that the gantry rotation frequency cannot be eliminated by the normalization of the corresponding sampling signals.
In addition, in this embodiment, whether the first channel and the second channel are in the same column is not specifically limited.
Step S203: and converting the processed signal from a time domain to a frequency domain to obtain a frequency domain signal.
Step S204: and if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotating frequency of the anode target.
Since the rectification frequency information is eliminated when the sampling signal is a time domain signal, the anode target rotation frequency and the gantry rotation frequency information only need to be considered when the preset frequency range is determined in step S204.
Based on the method for detecting the rotation frequency of the anode target provided by the above embodiment, the embodiment of the invention also provides a device for detecting the rotation frequency of the anode target, and the working principle of the device is described in detail with reference to the attached drawings.
EXAMPLE III
Referring to fig. 7, the figure is a block diagram of an anode target rotation frequency detection apparatus according to a third embodiment of the present invention.
The anode target rotation frequency detection device provided by the embodiment comprises: a sampling signal acquisition unit 101, a conversion unit 102, and a recognition unit 103;
the sampling signal acquiring unit 101 is configured to acquire a sampling signal output by the X-ray detector, where the sampling signal is a signal regarding an X-ray attenuation degree during a period of performing a CT scan;
the converting unit 102 is configured to convert the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
the identifying unit 103 is configured to identify a frequency as a rotation frequency of the anode target if the frequency domain signal has a frequency within a preset frequency range and only has one non-zero amplitude.
In this embodiment, a sampling signal output by an X-ray detector is obtained, the sampling signal is converted from a time domain to a frequency domain to obtain a frequency domain signal, and if the frequency domain signal exists in a preset frequency range and only has a frequency with a non-zero amplitude, the frequency is identified as the rotation frequency of the anode target. Compared with the technical scheme that a sensor is added in an X-ray bulb tube to detect the selection frequency of the anode target in the prior art, the method for detecting the rotation frequency of the anode target provided by the embodiment does not need to add any hardware, the rotation frequency of the anode target can be obtained by processing and analyzing the sampling signal by utilizing the prior X-ray bulb tube, and the detection cost of the rotation frequency of the anode target is effectively reduced.
Optionally, the preset frequency range does not include the commutation frequency and/or the gantry rotation frequency.
Optionally, the sampling signal acquiring unit 101 is specifically configured to:
acquiring a sampling signal of a first channel and a sampling signal of a second channel of the X-ray detector, wherein the first channel and the second channel are positioned in different rows of channels, and one row of channels corresponds to one layer of scanning image;
the device further comprises:
the processing unit is used for carrying out normalization processing on the sampling signal of the first channel and the sampling signal of the second channel to obtain a processed signal, and the processed signal is a signal for eliminating rectification frequency;
the conversion unit is specifically configured to convert the processed signal from a time domain to a frequency domain to obtain a frequency domain signal.
Optionally, the value corresponding to each time point of the processed signal is a ratio of the sampling signal of the first channel and the sampling signal of the second channel corresponding to the time point.
Optionally, the first channel and the second channel belong to two rows of channels farthest away, respectively.
The anode target rotation frequency detection device provided by the third embodiment can be applied to any electronic device with a processor, which can be any electronic device existing, being developed or developed in the future, including but not limited to: existing, developing or future developing desktop computers, laptop computers, mobile terminals (including smart phones, non-smart phones, various tablet computers), and the like. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the storage into the memory for operation through the processor of the electronic device with the processor, which is used as a logical device. From a hardware aspect, as shown in fig. 8, a hardware structure diagram of an electronic device with a processor where the anode target rotation frequency detection apparatus of the present invention is located is shown, except for the processor, the memory, the network interface, and the storage shown in fig. 8, the electronic device with a processor where the apparatus is located in the embodiment may further include other hardware, such as a display, according to the actual function of the device, which is not described again.
The memory may store logic instructions corresponding to the image reconstruction method, the memory may be a non-volatile memory (non-volatile memory), the processor may call the logic instructions stored in the execution memory to execute the image reconstruction method, and the display may display the rotation frequency of the anode target.
The function of the logic instruction corresponding to the anode target rotation frequency detection method, if implemented in the form of a software functional module and sold or used as a separate product, can be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Based on the method and the device for detecting the rotation frequency of the anode target provided by the embodiment, the embodiment of the invention also provides equipment for detecting the rotation frequency of the anode target, and the working principle of the equipment is described in detail below by combining the attached drawings.
Example four
The present embodiment provides an anode target rotational frequency detection apparatus, including:
a processor, a memory for storing the processor-executable instructions, and a display;
wherein the processor is configured to:
acquiring a sampling signal output by an X-ray detector, wherein the sampling signal is a signal about the attenuation degree of X-rays in the period of executing CT scanning;
converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
and if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotating frequency of the anode target.
The display is configured to:
displaying the rotation frequency of the anode target.
When introducing elements of various embodiments of the present invention, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
It should be noted that, as one of ordinary skill in the art would understand, all or part of the processes of the above method embodiments may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when executed, the computer program may include the processes of the above method embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. A method of detecting rotational frequency of an anode target, the method comprising:
acquiring a sampling signal output by an X-ray detector, wherein the sampling signal is a signal about the attenuation degree of X-rays in the period of executing CT scanning;
converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotation frequency of the anode target; the lower limit of the preset frequency range is lower than the specific rotation frequency of the anode target, and the upper limit of the preset frequency range is lower than the frequency doubling frequency of the anode target.
2. The method of claim 1, wherein the preset frequency range does not include a commutation frequency and/or a gantry rotation frequency.
3. The method of claim 1, wherein the acquiring sampled signals output by an X-ray detector comprises:
acquiring a sampling signal of a first channel and a sampling signal of a second channel of the X-ray detector, wherein the first channel and the second channel are positioned in different rows of channels, and one row of channels corresponds to one layer of scanning image;
the method further comprises the following steps:
normalizing the sampling signal of the first channel and the sampling signal of the second channel to obtain a processed signal, wherein the processed signal is a signal with rectification frequency eliminated;
the converting the sampled signal from the time domain to the frequency domain comprises:
converting the processed signal from a time domain to a frequency domain.
4. The method of claim 3, wherein the value corresponding to each time point of the processed signal is a ratio of the sampled signal of the first channel and the sampled signal of the second channel corresponding to the time point.
5. The method according to any one of claims 3 to 4, characterized in that said first and second channels belong respectively to the two rows of channels that are the furthest apart.
6. An anode target rotational frequency detection apparatus, comprising:
the device comprises a sampling signal acquisition unit, a conversion unit and an identification unit;
the sampling signal acquisition unit is used for acquiring a sampling signal output by the X-ray detector, wherein the sampling signal is a signal related to the attenuation degree of the X-ray in the period of executing the CT scanning;
the conversion unit is used for converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
the identification unit is used for identifying the frequency as the rotation frequency of the anode target if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists; the lower limit of the preset frequency range is lower than the specific rotation frequency of the anode target, and the upper limit of the preset frequency range is lower than the frequency doubling frequency of the anode target.
7. The apparatus of claim 6, wherein the predetermined frequency range does not include a commutation frequency and/or a gantry rotation frequency.
8. The apparatus according to claim 6, wherein the sampling signal obtaining unit is specifically configured to:
acquiring a sampling signal of a first channel and a sampling signal of a second channel of the X-ray detector, wherein the first channel and the second channel are positioned in different rows of channels, and one row of channels corresponds to one layer of scanning image;
the device further comprises:
the processing unit is used for carrying out normalization processing on the sampling signal of the first channel and the sampling signal of the second channel to obtain a processed signal, and the processed signal is a signal for eliminating rectification frequency;
the conversion unit is specifically configured to convert the processed signal from a time domain to a frequency domain to obtain a frequency domain signal.
9. The apparatus of claim 8, wherein the value corresponding to each time point of the processed signal is a ratio of the sampled signal of the first channel and the sampled signal of the second channel corresponding to the time point.
10. An anode target rotational frequency detection apparatus, comprising:
a processor, a memory for storing the processor-executable instructions, and a display;
wherein the processor is configured to:
acquiring a sampling signal output by an X-ray detector, wherein the sampling signal is a signal about the attenuation degree of X-rays in the period of executing CT scanning;
converting the sampling signal from a time domain to a frequency domain to obtain a frequency domain signal;
if the frequency domain signal exists in a preset frequency range and only one frequency with non-zero amplitude exists, identifying the frequency as the rotation frequency of the anode target; the lower limit of the preset frequency range is lower than the specific rotating frequency of the anode target, and the upper limit of the preset frequency range is lower than the frequency doubling frequency of the anode target;
the display is configured to:
displaying the rotation frequency of the anode target.
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| US3943356A (en) * | 1974-12-05 | 1976-03-09 | Advanced Instrument Development, Inc. | X-ray tube rotating anode sensing detector |
| SU1187288A1 (en) * | 1984-03-27 | 1985-10-23 | Московский научно-исследовательский онкологический институт им.П.А.Герцена | Method and apparatus for protection of x-ray unit against insufficient rotational speed of rotating target of x-ray tube |
| US5883487A (en) * | 1997-07-25 | 1999-03-16 | Continental X-Ray Corporation | Method and apparatus for determining the speed of rotation of an AC motor |
| US6341155B1 (en) * | 2000-03-08 | 2002-01-22 | Marconi Medical Systems, Inc. | Pulse detection system for X-ray tubes |
| CN104510486B (en) * | 2013-09-30 | 2021-04-20 | Ge医疗***环球技术有限公司 | Computerized tomography equipment and its frame rotation control device and method |
| CN105517309B (en) * | 2014-10-16 | 2018-06-29 | 锐珂（上海）医疗器材有限公司 | The anode Rotating speed measring of x ray generator |
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| Performance evaluation of an mr-compatible rotating anode X-ray tube;Mihye Shin, et al;《Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition》;20131121;第1-2页 * |
| 医用X射线球管阳极靶运行状态的估计;罗维涛 等;《电气传动》;20090831;第39卷(第8期);第69-73页 * |
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