阅读说明：本技术 磁共振成像设备及其监测方法 (Magnetic resonance imaging apparatus and monitoring method thereof ) 是由 何蛟龙 徐勤 徐志坚 王益宁 于 2020-11-04 设计创作，主要内容包括：本申请提供磁共振成像设备及其监测方法,磁共振成像设备包括磁体装置、光电探测器和控制装置。磁体装置包括主磁场线圈、梯度线圈和射频发射线圈,梯度线圈设于主磁场线圈的内侧,射频发射线圈设于梯度线圈的内侧。光电探测器设于梯度线圈与射频发射线圈之间,光电探测器包括感测端,感测端面向射频发射线圈设置,用于感测射频发射线圈产生的光信号,并输出相应的电信号。控制装置电连接光电探测器和磁体装置,控制装置用于接收电信号,并在接收到电信号时控制射频发射线圈停止发射。如此设置,利用光电探测器的感测端感测射频发射线圈产生的光信号,与相关技术相比,光电探测器能够实时感测射频发射线圈的异常状态,安全及时且简单可靠。(The application provides a magnetic resonance imaging apparatus and a monitoring method thereof, the magnetic resonance imaging apparatus includes a magnet device, a photodetector, and a control device. The magnet device comprises a main magnetic field coil, a gradient coil and a radio frequency transmitting coil, wherein 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 photoelectric detector is arranged between the gradient coil and the radio frequency transmitting coil and comprises a sensing end, and the sensing end is arranged towards the radio frequency transmitting coil and used for sensing an optical signal generated by the radio frequency transmitting coil and outputting a corresponding electric signal. The control device is electrically connected with the photoelectric detector and the magnet device and is used for receiving the electric signal and controlling the radio frequency transmitting coil to stop transmitting when receiving the electric signal. So set up, utilize the optical signal that photoelectric detector's sensing end sensing radio frequency transmitting coil produced, compare with the correlation technique, photoelectric detector can real-time sensing radio frequency transmitting coil's abnormal state, safe timely and simple and reliable.)

1. A magnetic resonance imaging apparatus, characterized by comprising:

the magnetic device comprises a main magnetic field coil, a gradient coil and a radio frequency transmitting coil, wherein 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 photoelectric detector is arranged between the gradient coil and the radio frequency transmitting coil and comprises a sensing end, and the sensing end is arranged facing the radio frequency transmitting coil and used for sensing an optical signal generated by the radio frequency transmitting coil and outputting a corresponding electric signal;

and the control device is electrically connected with the photoelectric detector and the magnet device and is used for receiving the electric signal and controlling the radio frequency transmitting coil to stop transmitting when receiving the electric signal.

2. The MRI apparatus of claim 1, wherein the photodetectors comprise at least two photodetectors, and at least two photodetectors are disposed between the gradient coil and the RF transmit coil and are distributed along a circumference of the RF transmit coil.

3. The mri apparatus of claim 1 or 2, wherein the photodetector is disposed in a gap between the gradient coil and the rf transmit coil at a distance from an outer peripheral wall of the rf transmit coil.

4. The MRI apparatus of claim 3, wherein the photodetector is secured within a gap between the gradient coil and the RF transmit coil by a support block.

5. A magnetic resonance imaging apparatus according to claim 3, wherein the photodetectors are provided on an inner peripheral wall of the gradient coil.

6. The MRI apparatus of claim 5, wherein the photodetectors are fixed to the inner peripheral wall of the gradient coil by support blocks; or

The photoelectric detector is adhered to the inner peripheral wall of the gradient coil through fixing glue.

7. The magnetic resonance imaging device of claim 2, wherein the photodetectors are distributed along an axial direction of the radio frequency transmit coil.

8. The MRI apparatus of claim 7, wherein the photodetectors are disposed at a middle and/or both ends of the RF transmitting coil in an axial direction.

9. The MRI device of claim 1, wherein the sensing ranges of two adjacent photodetectors partially overlap.

10. The magnetic resonance imaging apparatus according to claim 1, wherein a sensing range X of the sensing end of the photodetector is:

wherein the content of the first and second substances,

theta represents a sensing angle of the sensing end, and theta is more than 0 DEG and less than 180 DEG;

h represents a gap distance between the gradient coil and the radio frequency transmit coil.

11. A monitoring method of a magnetic resonance imaging apparatus, comprising:

transmitting a radio frequency signal through a radio frequency transmitting coil;

sensing an optical signal generated by the radio frequency transmitting coil through a photoelectric detector and outputting a corresponding electric signal;

and receiving the electric signal through a control device, and controlling the radio frequency transmitting coil to stop transmitting when receiving the electric signal.

Technical Field

The application relates to the technical field of medical imaging, in particular to a magnetic resonance imaging device and a monitoring method thereof.

Background

Magnetic Resonance Imaging (MRI) is an imaging technique that utilizes the phenomenon of nuclear Magnetic resonance of hydrogen nuclei (protons) in human tissues under the excitation of radio frequency pulses in a Magnetic field to generate nuclear resonance signals, and reconstructs an image of a certain layer of a human body through the processing of an electronic computer. The magnetic resonance imaging device is an imaging device based on a magnetic resonance imaging technology, is a tomography imaging device, and has the advantages of high image resolution, comprehensive examination, no wound and the like, so the magnetic resonance imaging device is widely applied to the field of medical imaging.

The magnetic resonance imaging equipment is extremely complex, the transmitting coil is used as a transmitting antenna, when the magnetic resonance imaging equipment scans, the voltage ratio among all electronic components in the transmitting coil is high, when individual electronic devices are damaged, due to the existence of potential difference, a spark phenomenon occurs, meanwhile, along with the occurrence of sparks, if continuous discharge possibly occurs, the spark phenomenon occurs in a closed space, and people cannot observe the spark phenomenon through naked eyes.

In the related art, whether parts in the transmitting coil are normal or not is judged by monitoring the standing-wave ratio abnormality of the transmitting coil, but the method is limited, the standing-wave ratio can be changed generally under the condition that the parts are seriously damaged, the parts cannot be timely monitored even if the parts are damaged in many cases, and the transmitting coil can be burnt out under the condition that the standing-wave ratio is not changed due to the ignition phenomenon of the transmitting coil, so that the safety of a patient is endangered.

Disclosure of Invention

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

The embodiment of the application provides a magnetic resonance imaging device, wherein, include:

the magnetic device comprises a main magnetic field coil, a gradient coil and a radio frequency transmitting coil, wherein 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 photoelectric detector is arranged between the gradient coil and the radio frequency transmitting coil and comprises a sensing end, and the sensing end is arranged facing the radio frequency transmitting coil and used for sensing an optical signal generated by the radio frequency transmitting coil and outputting a corresponding electric signal;

and the control device is electrically connected with the photoelectric detector and the magnet device and is used for receiving the electric signal and controlling the radio frequency transmitting coil to stop transmitting when receiving the electric signal.

Optionally, the at least two photodetectors are disposed between the gradient coil and the radio frequency transmitting coil and are distributed along a circumferential direction of the radio frequency transmitting coil.

Optionally, the photodetector is disposed in a gap between the gradient coil and the radio frequency transmitting coil, and has a distance from an outer peripheral wall of the radio frequency transmitting coil.

Optionally, the photodetector is fixed in a gap between the gradient coil and the radio frequency transmitting coil through a supporting block.

Optionally, the photodetector is disposed on an inner peripheral wall of the gradient coil.

Optionally, the photodetector is fixed to the inner peripheral wall of the gradient coil through a support block; or

The photoelectric detector is adhered to the inner peripheral wall of the gradient coil through fixing glue.

Optionally, the photodetectors are distributed along an axial direction of the radio frequency transmission coil.

Optionally, the photoelectric detector is disposed in the middle and/or at both ends of the radio frequency transmitting coil in the axial direction.

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

Optionally, a sensing range X of the sensing end of the photodetector is:

wherein the content of the first and second substances,

theta represents the sensing angle of the sensing end, and theta is more than 0 degree and less than 180 degrees;

h represents a gap distance between the gradient coil and the radio frequency transmit coil.

The present application also provides a monitoring method of a magnetic resonance imaging apparatus, wherein the monitoring method includes:

transmitting a radio frequency signal through a radio frequency transmitting coil;

sensing an optical signal generated by the radio frequency transmitting coil through a photoelectric detector and outputting a corresponding electric signal;

and receiving the electric signal through a control device, and controlling the radio frequency transmitting coil to stop transmitting when receiving the electric signal.

According to the technical scheme provided by the embodiment of the application, the photoelectric detector is arranged between the gradient coil and the radio frequency coil, the sensing end of the photoelectric detector is used for sensing the optical signal generated by the radio frequency transmitting coil and outputting a corresponding electric signal, the control device is used for receiving the electric signal, and the radio frequency transmitting coil is controlled to stop transmitting when the electric signal is received. So set up, utilize the optical signal that photoelectric detector's sensing end sensing radio frequency transmitting coil produced, compare with the correlation technique, photoelectric detector can real-time sensing radio frequency transmitting coil's abnormal state, safe timely and simple and reliable.

Drawings

Figure 1 shows a schematic view of an embodiment of a magnetic resonance imaging apparatus of the present application;

figure 2 shows a schematic view in partial radial cross-section of an embodiment of the magnetic resonance imaging apparatus shown in figure 1;

figure 3 shows a schematic partial axial cross-sectional view of an embodiment of the magnetic resonance imaging apparatus shown in figure 1;

figure 4 shows a schematic view in partial radial cross-section of another embodiment of the magnetic resonance imaging apparatus shown in figure 1;

figure 5 is a schematic partial axial cross-sectional view of another embodiment of the magnetic resonance imaging apparatus shown in figure 1;

fig. 6 is a flowchart illustrating an embodiment of a monitoring method of a magnetic resonance imaging apparatus provided in the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" includes two, and is equivalent to at least two. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Figure 1 shows a schematic diagram of an embodiment of a magnetic resonance imaging apparatus 10 of the present application; figure 2 shows a schematic view in partial radial cross-section of an embodiment of the magnetic resonance imaging apparatus 10 shown in figure 1; figure 3 is a partial axial cross-sectional schematic view of one embodiment of the magnetic resonance imaging apparatus 10 shown in figure 1. As shown in connection with fig. 1 to 3, the magnetic resonance imaging apparatus 10 includes a magnet device 11, a photodetector 12, and a control device 13. In some embodiments, the magnet arrangement 11 comprises main magnetic field coils 111, gradient coils 112 and radio frequency transmit coils 113. Gradient coils 112 are provided inside the main magnetic field coils 111, and radio frequency transmit coils 113 are provided inside the gradient coils 112. The main magnetic field coils 111 are used to generate a uniform and steady static magnetic field. The gradient coils 112 are used to superimpose a non-uniform magnetic field within the static magnetic field generated by the main magnet coils 111 so as to vary the magnetic field strength at various points in the imaging volume of the magnetic resonance imaging apparatus 10. The radio frequency transmission coil 113 is used to transmit radio frequency pulses to cause magnetized protons to absorb energy to generate resonance, and to receive energy released by the protons during relaxation to generate MR signals (magnetic resonance signals).

Since the radio frequency transmitting coil 113 is used as a transmitting antenna, when the magnetic resonance imaging apparatus 10 scans, the voltage ratio between the electronic components of the radio frequency transmitting coil 113 is high, when the individual electronic device is damaged, spark may occur due to the potential difference, and the spark may occur due to the spark, and these phenomena occur in the closed space, which cannot be observed by naked eyes. Therefore, the present application arranges the photodetector 12, and arranges the photodetector 12 between the gradient coil 112 and the rf transmitting coil 113, so that the photodetector 12 can sense whether the rf transmitting coil 113 has a spark phenomenon (generates an optical signal) in real time, that is, can sense an abnormal condition (generates a spark) generated by the rf transmitting coil 113. In some embodiments, the photodetector 12 includes a sensing end 121, and the sensing end 121 is disposed facing the radio frequency transmission coil 113, and is configured to sense an optical signal generated by the radio frequency transmission coil 113 and output a corresponding electrical signal. The optical signal generated by the rf transmitting coil 113 is an ignition phenomenon accompanied by sparks or sparks when abnormality or damage occurs in a part of electronic components inside the rf transmitting coil 113. When the radio frequency transmitting coil 113 generates an optical signal (spark or spark), it indicates that the radio frequency transmitting coil 113 is abnormal or damaged, and when the radio frequency transmitting coil 113 does not generate an optical signal (spark or spark), it indicates that the radio frequency transmitting coil 113 is normal. Set up sensing end 121 towards radio frequency transmitting coil 113, make sensing end 121 more be close to in radio frequency transmitting coil 113, when spark or spark appear in radio frequency transmitting coil 113, can be timely detect for the testing result is more accurate, and convert spark or spark that appear into corresponding signal of telecommunication output, in time make the feedback, can avoid taking place the unnecessary damage, protection patient's safety. Compared with the related technology, the detection mode is safe, timely, simple and reliable.

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 configured to receive the electrical signal and control the radio frequency transmission coil 113 to stop transmitting when receiving the electrical signal. 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 radio frequency transmitting coil 113, the signal receiving unit 131 is configured to receive an electrical signal output by the photodetector 12, and the signal control unit 132 controls the radio frequency transmitting coil 113 to stop transmitting when receiving the electrical signal.

With such an arrangement, the sensing end 121 of the photodetector 12 senses the optical signal generated by the rf transmitting coil 113, compared with the related art, the photodetector 12 can sense the abnormal state (spark or spark) of the rf transmitting coil 113 in real time, and when the spark or spark occurs in the rf transmitting coil 113, the abnormal state can be timely detected by the photodetector 12, and the control device 13 controls the rf transmitting coil 113 to stop transmitting, thereby avoiding injury to the patient.

In some embodiments, the control device 13 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The control device 13 may be a microprocessor or the control device 13 may be any conventional processor and the like, which will not be described herein.

In some embodiments, the photodetectors 12 include at least two, and at least two photodetectors 12 are disposed between the gradient coil 112 and the radio frequency transmit coil 113, and are distributed along a circumference of the radio frequency transmit coil 113. In some embodiments, two photodetectors 12 may be provided. In other embodiments, more than two photodetectors 12 may be provided. The number of photodetectors 12 may be set as desired, but is not limited thereto. In some embodiments, the photodetectors 12 are distributed along a radial direction of the radio frequency transmission coil 113 (as shown in fig. 2 and 4). In some embodiments, the photodetectors 12 are distributed along the axis of the radio frequency transmission coil 113 (as shown in fig. 3 and 5). Because sparks or sparks are easy to appear at the middle part and two ends of the radio frequency transmitting coil 113 in the axial direction, the photoelectric detector 12 is arranged at the middle part and/or two ends of the radio frequency transmitting coil 113 in the axial direction, so that sparks or sparks are easy to be detected in time when sparks or sparks appear at the middle part and two ends of the radio frequency transmitting coil 113 in the axial direction, and the injury to patients and unnecessary loss are avoided.

In the embodiment shown in fig. 2, the photodetectors 12 may be provided in plurality and distributed along the radial direction of the radio frequency transmission coil 113. In the embodiment shown in fig. 3, the photodetectors 12 may be provided in plurality and distributed along the axial direction of the radio frequency transmission coil 113. In the embodiment shown in fig. 2 and 3, the photodetectors 12 are uniformly distributed, and the sensing range of the sensing end 121 of the photodetector 12 can cover the surface of the radio frequency transmission coil 113.

In other embodiments, the photodetectors 12 may be distributed unevenly, and the sensing range of the sensing end 121 covers the surface of the rf transmitting coil 113, which is not described herein again. In other embodiments, the photodetectors 12 may be provided with areas susceptible to sparks or sparks (e.g., areas located at the axial middle and ends of the radio frequency transmission coil 113), and the number of photodetectors 12 may be reduced, but not limited thereto.

In some embodiments, the photodetector 12 is disposed in the gap between the gradient coil 112 and the radio frequency transmit coil 113 at a distance from the outer perimeter wall of the radio frequency transmit coil 113 (as shown in fig. 2 and 3). By such arrangement, the sensing end 121 of the photodetector 12 is closer to the surface of the rf transmitting coil 113, so that the detection is more timely and the detection result is more accurate. In some embodiments, the photodetectors 12 are secured within the gap between the gradient coil 112 and the radio frequency transmit coil 113 by support blocks 114. The supporting block 114 can be a fixing member, a limiting member, etc., but is not limited thereto, and the supporting block 114 is used for fixing the photodetector 12, as shown in fig. 2 and 3.

Figure 4 is a schematic partial radial cross-sectional view of another embodiment of the magnetic resonance imaging apparatus 10 shown in figure 1; figure 5 is a schematic partial axial cross-sectional view of another embodiment of the magnetic resonance imaging apparatus 10 shown in figure 1. Similar to the embodiment shown in fig. 2 and 3, photodetectors 12 may be provided on the inner circumferential wall of gradient coil 112, as shown in fig. 4 and 5. The photodetector 12 is directly fixed on the inner peripheral wall of the gradient coil 112, so that the stability is good and the falling is not easy to occur. In the present embodiment, the photodetector 12 is attached to the inner peripheral wall of the gradient coil 112 by fixing glue. The assembly mode is simple, the components are saved, and the cost is reduced. In other examples, the photodetector 12 may be secured to the inner peripheral wall of the radio frequency transmission coil 113 by a support block, which may be the support block 114 described above with reference to fig. 2 and 3.

In the embodiment shown in fig. 2 and 3, the sensing ranges of two adjacent photodetectors 12 partially overlap. Two or more photodetectors 12 are provided, and the sensing ranges are partially overlapped, so that the surface of the radio frequency transmission coil 113 is fully covered, and the detection result is more accurate. In the embodiment shown in fig. 3, the sensing range X of the sensing end 121 of the photodetector 12 is:

wherein theta represents the sensing angle of the sensing end 121, and theta is more than 0 degree and less than 180 degrees; h denotes the gap distance between the gradient coil 112 and the radio frequency transmit coil 113.

In the magnetic resonance imaging apparatus 10, the gap distance H between the gradient coil 112 and the radio frequency transmission coil 113 is a variable value due to different models of the apparatus, and the sensing angle θ of the photodetector 12 is also a variable value, for example, 0 ° < θ < 180 °.

In practical applications, when the gap distance H between the gradient coil 112 and the radio frequency transmitting coil 113 and the sensing angle θ of the photodetector 12 are fixed, the sensing range X of the sensing end 121 of the photodetector 12 can be calculated by the above formula, and at least several rows of photodetectors 12 can be arranged in the axial direction of the radio frequency transmitting coil 113 according to the ratio between the size of the axial direction of the radio frequency transmitting coil 113 and the sensing range X.

For example, when the gap distance H between the gradient coil 112 and the radio frequency transmission coil 113 is 30mm, and the sensing angle θ of the photodetector 12 is 135 °, the sensing range X of the sensing end 121 of the photodetector 12 can be calculated to be 145 mm. When the dimension of the radio frequency transmitting coil 113 in the axial direction is 450mm, it can be known that at least 3 rows of the photodetectors 12 are arranged in the axial direction of the radio frequency transmitting coil 113, and the surface of the radio frequency transmitting coil 113 can be completely covered.

By calculating the number of the photodetectors 12, the photodetectors 12 can be effectively arranged, and the surface of the rf transmitting coil 113 can be completely covered, so that the sensing range is more comprehensive and the detection result is more accurate.

Fig. 6 is a flowchart illustrating an embodiment of a monitoring method of a magnetic resonance imaging apparatus provided in the present application. As shown in fig. 6, the monitoring method of the magnetic resonance imaging apparatus includes steps S11-S13. Wherein the content of the first and second substances,

step S11, transmitting a radio frequency signal through the radio frequency transmission coil. The radio frequency transmitting coil is used for transmitting radio frequency pulses to enable magnetized protons to absorb energy to generate resonance and receiving the energy released by the protons in the relaxation process to generate MR signals (magnetic resonance signals) when the radio frequency transmitting coil works normally.

Step S12, sensing the optical signal generated by the radio frequency transmitting coil through the photodetector, and outputting a corresponding electrical signal. The optical signal generated by the rf transmitting coil 113 is an ignition phenomenon accompanied by sparks or sparks when abnormality or damage occurs in a part of electronic components inside the rf transmitting coil. When the radio frequency transmitting coil generates an optical signal (spark or spark), it indicates that the radio frequency transmitting coil is abnormal or damaged. When the radio frequency transmitting coil does not generate an optical signal (sparks or sparks), it indicates that the radio frequency transmitting coil is normal. Further, whether the radio frequency transmitting coil has an ignition phenomenon (generates an optical signal) is sensed in real time through a sensing end of the photoelectric detector, that is, an abnormal condition (spark occurrence) generated by the radio frequency transmitting coil can be sensed through the photoelectric detector, and a corresponding electric signal is output. So set up, when radio frequency transmitting coil 113 appears sparks or spark, can be timely detected by photoelectric detector 12, and this detection mode is safe timely and simple reliable.

And step S13, receiving the electric signal through the control device, and controlling the radio frequency transmitting coil to stop transmitting when receiving the electric signal. 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 radio frequency transmitting coil, the signal receiving unit is configured to receive an electrical signal output by the photodetector, and the signal control unit controls the radio frequency transmitting coil to stop transmitting when receiving the electrical signal.

So set up, utilize the optical signal that photoelectric detector's sensing end sensing radio frequency transmitting coil produced, compare with the correlation technique, photoelectric detector can real-time sensing radio frequency transmitting coil's abnormal state (spark or spark appear), when spark or spark appear in radio frequency transmitting coil, can be by timely detection of photoelectric detector to control radio frequency transmitting coil through controlling means and stop the transmission, avoid causing the injury to patient.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.