Magnetic resonance imaging device and monitoring method thereof

Abstract

The present application provides a magnetic resonance imaging device and a monitoring method thereof. The magnetic resonance imaging device includes a magnet device, a photodetector and a control device. The magnet device includes a main magnetic field coil, a gradient coil and a radio frequency transmitting coil. The gradient coil is arranged on the inner side of the main magnetic field coil, and the radio frequency transmitting coil is arranged on the inner side of the gradient coil. The photodetector is arranged between the gradient coil and the radio frequency transmitting coil. The photodetector includes a sensing end. The sensing end is arranged facing the radio frequency transmitting coil, and is used to sense the optical signal generated by the radio frequency transmitting coil and output a corresponding electrical signal. The control device is electrically connected to the photodetector and the magnet device. The control device is used to receive the electrical signal and control the radio frequency transmitting coil to stop transmitting when the electrical signal is received. In this arrangement, the optical signal generated by the radio frequency transmitting coil is sensed by the sensing end of the photodetector. Compared with the related art, the photodetector can sense the abnormal state of the radio frequency transmitting coil in real time, which is safe, timely, simple and reliable.

Description

Technical Field

[0001] The present application relates to the field of medical imaging technology, and in particular to a magnetic resonance imaging device and a monitoring method thereof. Background Art

[0002] Magnetic resonance imaging (MRI) technology is an imaging technology that uses the nuclear magnetic resonance phenomenon that occurs when hydrogen nuclei (protons) in human tissue are stimulated by radio frequency pulses in a magnetic field, generating nuclear resonance signals, and reconstructing images of a certain level of the human body through electronic computer processing. Magnetic resonance imaging equipment is an imaging device based on magnetic resonance imaging technology. It is a type of tomography imaging. It has the advantages of high image resolution, comprehensive examination, and non-invasiveness. Therefore, it has been widely used in the field of medical imaging.

[0003] Magnetic resonance imaging equipment is extremely complex. The transmitting coil acts as the transmitting antenna. When the magnetic resonance imaging equipment is scanning, the voltage between the various electronic components in the transmitting coil is relatively high. When individual electronic components are damaged, sparks may occur due to the potential difference, accompanied by sparks. If the discharge continues, sparks may appear. These phenomena occur in a closed space and cannot be observed with the naked eye.

[0004] In the related art, the abnormal standing wave ratio of the transmitting coil is monitored to determine whether the components in the transmitting coil are normal. However, this method is relatively limited. Generally, the standing wave ratio will not change until the components are severely damaged. In many cases, even if the components are damaged, it cannot be monitored in time. If sparks occur in the transmitting coil and the standing wave ratio remains unchanged, the transmitting coil may be burned through, thereby endangering the safety of the patient. Summary of the invention

[0005] The present application provides a safe, timely, simple and reliable magnetic resonance imaging device and a monitoring method thereof.

[0006] The present application provides a magnetic resonance imaging device, which includes:

[0007] A magnet device, comprising a main magnetic field coil, a gradient coil and a radio frequency transmitting coil, wherein the gradient coil is arranged inside the main magnetic field coil, and the radio frequency transmitting coil is arranged inside the gradient coil;

[0008] A photodetector is disposed between the gradient coil and the radio frequency transmitting coil, the photodetector comprises a sensing end, the sensing end is disposed facing the radio frequency transmitting coil, and is used to sense the optical signal generated by the radio frequency transmitting coil and output a corresponding electrical signal;

[0009] A control device is electrically connected to the photoelectric detector and the magnetic device, and is used to receive the electrical signal and control the radio frequency transmitting coil to stop transmitting when receiving the electrical signal.

[0010] Optionally, the photodetector includes at least two photodetectors, and the at least two photodetectors are arranged between the gradient coil and the radio frequency transmitting coil and distributed along the circumference of the radio frequency transmitting coil.

[0011] Optionally, the photodetector is disposed in a gap between the gradient coil and the radio frequency transmitting coil, and is spaced apart from an outer peripheral wall of the radio frequency transmitting coil.

[0012] Optionally, the photodetector is fixed in a gap between the gradient coil and the radio frequency transmitting coil via a support block.

[0013] Optionally, the photodetector is arranged on the inner wall of the gradient coil.

[0014] Optionally, the photodetector is fixed to the inner peripheral wall of the gradient coil via a support block; or

[0015] The photoelectric detector is bonded to the inner peripheral wall of the gradient coil by means of fixing glue.

[0016] Optionally, the photodetectors are distributed along the axial direction of the radio frequency transmitting coil.

[0017] Optionally, the photodetector is arranged at the middle and / or both ends of the axial direction of the radio frequency transmitting coil.

[0018] Optionally, the sensing ranges of two adjacent photodetectors partially overlap.

[0019] Optionally, the sensing range of the sensing end of the photodetector is for:

[0020] ;

[0021] in,

[0022] Indicates the sensing angle of the sensing end, ;

[0023] H represents the gap distance between the gradient coil and the RF transmitting coil.

[0024] The present application also provides a monitoring method for a magnetic resonance imaging device, wherein the monitoring method is applied to the magnetic resonance imaging device as described in any one of the above embodiments, and the monitoring method comprises:

[0025] transmitting a radio frequency signal via a radio frequency transmitting coil;

[0026] The photodetector senses the optical signal generated by the radio frequency transmitting coil and outputs a corresponding electrical signal;

[0027] The electrical signal is received by a control device, and the radio frequency transmitting coil is controlled to stop transmitting when the electrical signal is received.

[0028] According to the technical solution provided in the embodiment of the present application, a photodetector is arranged between the gradient coil and the radio frequency coil, and the sensing end of the photodetector is used to sense the optical signal generated by the radio frequency transmitting coil, and a corresponding electrical signal is output, and the electrical signal is received by the control device, and the radio frequency transmitting coil is controlled to stop transmitting when the electrical signal is received. In this arrangement, the optical signal generated by the radio frequency transmitting coil is sensed by the sensing end of the photodetector. Compared with the related art, the photodetector can sense the abnormal state of the radio frequency transmitting coil in real time, which is safe, timely, simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a schematic diagram of an embodiment of a magnetic resonance imaging device of the present application;

[0030] Figure 2 Shown Figure 1 A partial radial cross-sectional schematic diagram of an embodiment of a magnetic resonance imaging apparatus is shown;

[0031] Figure 3 Shown Figure 1 A partial axial cross-sectional schematic diagram of an embodiment of a magnetic resonance imaging apparatus is shown;

[0032] Figure 4 Shown Figure 1 A partial radial cross-sectional schematic diagram of another embodiment of a magnetic resonance imaging apparatus is shown;

[0033] Figure 5 Shown Figure 1 A partial axial cross-sectional schematic diagram of another embodiment of a magnetic resonance imaging apparatus is shown;

[0034] Figure 6 Shown is a flow chart of an embodiment of a method for monitoring a magnetic resonance imaging device provided by the present application. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0036] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "one" or "one" and the like used in this application specification and claims do not indicate a quantitative limitation, but indicate the existence of at least one. "Multiple" includes two, which is equivalent to at least two. "Including" or "including" and the like mean that the elements or objects appearing in front of "including" or "including" include the elements or objects listed after "including" or "including" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and the like are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. The singular forms of "one", "said" and "the" used in this application specification and the attached claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0037] Figure 1 Shown is a schematic diagram of an embodiment of a magnetic resonance imaging device 10 of the present application; Figure 2 Shown Figure 1 A partial radial cross-sectional schematic diagram of an embodiment of a magnetic resonance imaging apparatus 10 is shown; Figure 3 Shown Figure 1 FIG. 1 is a partial axial cross-sectional diagram of an embodiment of a magnetic resonance imaging apparatus 10 shown in FIG. Figures 1 to 3 As shown, the magnetic resonance imaging device 10 includes a magnet device 11, a photodetector 12 and a control device 13. In some embodiments, the magnet device 11 includes a main magnetic field coil 111, a gradient coil 112 and a radio frequency transmitting coil 113. The gradient coil 112 is arranged on the inner side of the main magnetic field coil 111, and the radio frequency transmitting coil 113 is arranged on the inner side of the gradient coil 112. The main magnetic field coil 111 is used to generate a uniform and stable static magnetic field. The gradient coil 112 is used to superimpose an inhomogeneous magnetic field in the static magnetic field generated by the main magnet coil 111, so as to change the magnetic field intensity at each point in the imaging space of the magnetic resonance imaging device 10. The radio frequency transmitting coil 113 is used to transmit radio frequency pulses, so that the magnetized protons absorb energy to generate resonance, and receive the energy released by the protons during the relaxation process, so as to generate MR signals (magnetic resonance signals).

[0038] Since the RF transmitting coil 113 is used as a transmitting antenna, when the magnetic resonance imaging device 10 is scanning, the voltage between the various electronic components of the RF transmitting coil 113 is relatively high. When individual electronic devices are damaged, due to the potential difference, sparking occurs, accompanied by sparks. If the discharge continues, sparks may appear. These phenomena occur in a closed space and we cannot observe them with the naked eye. Therefore, the present application sets a photodetector 12, and sets the photodetector 12 between the gradient coil 112 and the RF transmitting coil 113. The photodetector 12 can sense in real time whether the RF transmitting coil 113 has a sparking phenomenon (generating a light signal), that is, it can sense the abnormal situation (sparks) generated by the RF transmitting coil 113. In some embodiments, the photodetector 12 includes a sensing end 121, which is arranged facing the RF transmitting coil 113, and is used to sense the light signal generated by the RF transmitting coil 113 and output a corresponding electrical signal. The light signal generated by the RF transmitting coil 113 is a sparking phenomenon that occurs when some electronic components inside the RF transmitting coil 113 are abnormal or damaged, and is accompanied by sparks or sparks. When the RF transmitting coil 113 generates an optical signal (spark or spark), it indicates that the RF transmitting coil 113 is abnormal or damaged. When the RF transmitting coil 113 does not generate an optical signal (spark or spark), it indicates that the RF transmitting coil 113 is normal. The sensing end 121 is set facing the RF transmitting coil 113 so that the sensing end 121 is closer to the RF transmitting coil 113. When sparks or sparks appear in the RF transmitting coil 113, they can be detected in time, making the detection result more accurate. The sparks or sparks that appear are converted into corresponding electrical signal outputs, and feedback is given in time to avoid unnecessary damage and protect patient safety. Compared with related technologies, this detection method is safe, timely, simple and reliable.

[0039] In some embodiments, the control device 13 is electrically connected to the photodetector 12 and the magnet device 11, and the control device 13 is used to receive an electrical signal, and control the RF transmitting coil 113 to stop transmitting when the electrical signal is received. In some embodiments, the control device 13 includes a signal receiving unit 131 and a signal control unit 132, the signal receiving unit 131 is electrically connected to the photodetector 12, the signal control unit 132 is electrically connected to the signal receiving unit 131 and the RF transmitting coil 113, the signal receiving unit 131 is used to receive the electrical signal output by the photodetector 12, and the signal control unit 132 controls the RF transmitting coil 113 to stop transmitting when the electrical signal is received.

[0040] In this configuration, the sensing end 121 of the photodetector 12 is used to sense the optical signal generated by the RF transmitting coil 113. Compared with the related art, the photodetector 12 can sense the abnormal state of the RF transmitting coil 113 (the occurrence of sparks or sparks) in real time. When sparks or sparks appear in the RF transmitting coil 113, they can be detected in time by the photodetector 12, and the RF transmitting coil 113 can be controlled by the control device 13 to stop transmitting, so as to avoid causing harm to the patient.

[0041] In some embodiments, the control device 13 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The control device 13 may be a microprocessor or any conventional processor, etc., which will not be described in detail here.

[0042] In some embodiments, the photodetector 12 includes at least two photodetectors 12, which are arranged between the gradient coil 112 and the RF transmitting coil 113 and distributed along the circumference of the RF transmitting coil 113. In some embodiments, two photodetectors 12 can be provided. In some other embodiments, more than two photodetectors 12 can be provided. The number of photodetectors 12 can be set as needed, but is not limited thereto. In some embodiments, the photodetectors 12 are distributed along the radial direction of the RF transmitting coil 113 (e.g., Figure 2 and Figure 4 In some embodiments, the photodetectors 12 are distributed along the axial direction of the RF transmitting coil 113 (as shown in FIG. Figure 3 and Figure 5 As shown in the figure). Since sparks or fire are likely to appear in the axial middle and both ends of the RF transmitting coil 113, the photoelectric detector 12 is arranged in the axial middle and / or both ends of the RF transmitting coil 113, so that when sparks or fire appear in the axial middle and both ends of the RF transmitting coil 113, they can be easily detected in time, thereby avoiding harm to the patient and unnecessary losses.

[0043] exist Figure 2 In the embodiment shown, a plurality of photodetectors 12 may be provided and distributed along the radial direction of the radio frequency transmitting coil 113. Figure 3In the embodiment shown, a plurality of photodetectors 12 may be provided and distributed along the axial direction of the radio frequency transmitting coil 113. Figure 2 and Figure 3 In the illustrated embodiment, the photodetectors 12 are evenly distributed, and the sensing range of the sensing end 121 of the photodetector 12 can cover the surface of the RF transmitting coil 113 .

[0044] In some other embodiments, the photodetectors 12 may be unevenly distributed, and the sensing range of the sensing end 121 thereof only needs to cover the surface of the RF transmitting coil 113, which will not be described in detail here. In some other embodiments, the photodetectors 12 may be arranged in areas where sparks or sparks are likely to appear (for example, areas located in the middle and both ends of the axial direction of the RF transmitting coil 113), and the number of the photodetectors 12 may be reduced, but it is not limited thereto.

[0045] In some embodiments, the photodetector 12 is disposed in the gap between the gradient coil 112 and the RF transmitting coil 113, and has a distance (eg, Figure 2 and Figure 3 As shown). This arrangement makes the sensing end 121 of the photodetector 12 closer to the surface of the RF transmitting coil 113, making the detection more timely and the detection result more accurate. In some embodiments, the photodetector 12 is fixed in the gap between the gradient coil 112 and the RF transmitting coil 113 by the support block 114. The support block 114 can be a fixing member, a stopper, etc., but is not limited thereto. The support block 114 is used to fix the photodetector 12 and plays a fixing role, such as Figure 2 and Figure 3 shown.

[0046] Figure 4 Shown Figure 1 A partial radial cross-sectional schematic diagram of another embodiment of the magnetic resonance imaging apparatus 10 is shown; Figure 5 Shown Figure 1 FIG. 1 is a partial axial cross-sectional diagram of another embodiment of a magnetic resonance imaging apparatus 10 shown in FIG. Figure 2 and Figure 3 The embodiment shown is similar to Figure 4 and Figure 5 As shown, the photodetector 12 can be arranged on the inner wall of the gradient coil 112. The photodetector 12 is directly fixed to the inner wall of the gradient coil 112, which has good stability and is not easy to fall off. In this embodiment, the photodetector 12 is bonded to the inner wall of the gradient coil 112 by a fixing glue. This assembly method is simple, saves parts, and reduces costs. In other examples, the photodetector 12 can be fixed to the inner wall of the RF transmitting coil 113 by a supporting block, and the supporting block can be the above-mentioned Figure 2 and Figure 3 The support block 114 is shown.

[0047] exist Figure 2 and Figure 3 In the embodiment shown, the sensing ranges of two adjacent photodetectors 12 partially overlap. By providing two or more photodetectors 12 with partially overlapping sensing ranges, the surface of the RF transmitting coil 113 is fully covered, making the detection result more accurate. Figure 3 In the embodiment shown, the sensing range of the sensing end 121 of the photodetector 12 is for:

[0048] ;

[0049] in, represents the sensing angle of the sensing end 121, ; H represents the gap distance between the gradient coil 112 and the RF transmitting coil 113.

[0050] In the magnetic resonance imaging device 10, due to different models of the device, the gap distance H between the gradient coil 112 and the radio frequency transmitting coil 113 is a variable value, and the sensing angle of the photodetector 12 is It is also a mutable value, for example, .

[0051] In practical applications, the gap distance H between the gradient coil 112 and the RF transmitting coil 113 and the sensing angle of the photodetector 12 are When a certain time is reached, the sensing range of the sensing end 121 of the photodetector 12 can be calculated by the above formula: , or according to the axial size and sensing range of the RF transmitting coil 113 The ratio of the number of photoelectric detectors 12 to be arranged in the axial direction of the radio frequency transmitting coil 113 is calculated.

[0052] For example, the gap distance H between the gradient coil 112 and the RF transmitting coil 113 is 30 mm, and the sensing angle of the photodetector 12 is for When the sensing range of the sensing end 121 of the photodetector 12 is calculated, When the axial dimension of the RF transmitting coil 113 is 450 mm, it can be seen that at least three rows of photoelectric detectors 12 are arranged in the axial direction of the RF transmitting coil 113 to fully cover the surface of the RF transmitting coil 113 .

[0053] By calculating the number of the photodetectors 12 in this way, the photodetectors 12 can be effectively arranged, and the surface of the radio frequency transmitting coil 113 can be fully covered, so that the sensing range is more comprehensive and the detection result is more accurate.

[0054] Figure 6 FIG. 1 is a flow chart of an embodiment of a method for monitoring a magnetic resonance imaging device provided by the present application. Figure 6 As shown, the monitoring method of the magnetic resonance imaging device includes steps S11-S13.

[0055] Step S11, transmitting a radio frequency signal through the radio frequency transmitting coil. When the radio frequency transmitting coil works normally, it is used to transmit radio frequency pulses, so that the magnetized protons absorb energy to generate resonance, and receive energy released by the protons during the relaxation process to generate MR signals (magnetic resonance signals).

[0056] Step S12, sensing the light signal generated by the RF transmitting coil through a photodetector, and outputting a corresponding electrical signal. The light signal generated by the RF transmitting coil 113 is a sparking phenomenon that occurs when some electronic components inside the RF transmitting coil are abnormal or damaged, accompanied by sparks or sparks. When the RF transmitting coil generates a light signal (spark or spark), it indicates that the RF transmitting coil is abnormal or damaged. When the RF transmitting coil does not generate a light signal (spark or spark), it indicates that the RF transmitting coil is normal. Further, the sensing end of the photodetector is used to sense in real time whether the RF transmitting coil has a sparking phenomenon (generating a light signal), that is, the photodetector can be used to sense the abnormal situation (spark) generated by the RF transmitting coil and output a corresponding electrical signal. In this way, when sparks or sparks appear in the RF transmitting coil 113, they can be detected in time by the photodetector 12. This detection method is safe, timely, simple and reliable.

[0057] Step S13, receiving the electrical signal through the control device, and controlling the RF transmitting coil to stop transmitting when the electrical signal is received. In some embodiments, the control device includes a signal receiving unit and a signal control unit, the signal receiving unit is electrically connected to the photodetector, the signal control unit is electrically connected to the signal receiving unit and the RF transmitting coil, the signal receiving unit is used to receive the electrical signal output by the photodetector, and the signal control unit controls the RF transmitting coil to stop transmitting when the electrical signal is received.

[0058] In this arrangement, the sensing end of the photodetector is used to sense the light signal generated by the RF transmitting coil. Compared with the related technology, the photodetector can sense the abnormal state of the RF transmitting coil (the appearance of sparks or sparks) in real time. When sparks or sparks appear in the RF transmitting coil, they can be detected in time by the photodetector, and the RF transmitting coil can be controlled by the control device to stop transmitting, so as to avoid harm to the patient.

[0059] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A magnetic resonance imaging device, characterized in that: include: A magnet device, comprising a main magnetic field coil, a gradient coil and a radio frequency transmitting coil, wherein the gradient coil is arranged inside the main magnetic field coil, and the radio frequency transmitting coil is arranged inside the gradient coil; A photodetector is disposed between the gradient coil and the radio frequency transmitting coil, the photodetector comprises a sensing end, the sensing end is disposed facing the radio frequency transmitting coil, and is used to sense the optical signal generated by the radio frequency transmitting coil and output a corresponding electrical signal; wherein a plurality of photodetectors are provided, and the sensing range of the sensing ends of the plurality of photodetectors covers the surface of the radio frequency transmitting coil; A control device is electrically connected to the photoelectric detector and the magnetic device, and is used to receive the electrical signal and control the radio frequency transmitting coil to stop transmitting when receiving the electrical signal.

2. The magnetic resonance imaging device according to claim 1, characterized in that The photodetectors include at least two photodetectors, which are arranged between the gradient coil and the radio frequency transmitting coil and distributed along the circumference of the radio frequency transmitting coil.

3. The magnetic resonance imaging device according to claim 1 or 2, characterized in that: The photodetector is disposed in a gap between the gradient coil and the radio frequency transmitting coil, and is spaced apart from an outer peripheral wall of the radio frequency transmitting coil.

4. The magnetic resonance imaging device according to claim 3, characterized in that The photodetector is fixed in the gap between the gradient coil and the radio frequency transmitting coil through a supporting block.

5. The magnetic resonance imaging apparatus according to claim 3, characterized in that The photoelectric detector is arranged on the inner peripheral wall of the gradient coil.

6. The magnetic resonance imaging device according to claim 5, characterized in that The photodetector is fixed to the inner wall of the gradient coil via a support block; or The photoelectric detector is bonded to the inner peripheral wall of the gradient coil by means of fixing glue.

7. The magnetic resonance imaging device according to claim 2, characterized in that: The photoelectric detectors are distributed along the axial direction of the radio frequency transmitting coil.

8. The magnetic resonance imaging device according to claim 7, characterized in that: The photoelectric detector is arranged at the middle part and / or both ends of the axial direction of the radio frequency transmitting coil.

9. The magnetic resonance imaging device according to claim 1, characterized in that: The sensing ranges of two adjacent photodetectors partially overlap.

10. The magnetic resonance imaging device according to claim 1, characterized in that The sensing range of the sensing end of the photodetector for: ； in, represents the sensing angle of the sensing end, ; H represents the gap distance between the gradient coil and the RF transmitting coil.

11. A method for monitoring a magnetic resonance imaging device, characterized in that: Applied to the magnetic resonance imaging device according to any one of claims 1 to 10, the monitoring method comprises: transmitting a radio frequency signal via a radio frequency transmitting coil; The photodetector senses the optical signal generated by the radio frequency transmitting coil and outputs a corresponding electrical signal; The electrical signal is received by a control device, and the radio frequency transmitting coil is controlled to stop transmitting when the electrical signal is received.

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