Fnirs system compatible with MRI imaging system and having optimized wire harness length and debugging method

Abstract

The invention provides an fnirs system compatible with an MRI imaging system and having an optimized wire harness length and a debugging method. The fnirs system comprises a head cap, an SD probe set on the head cap and a host, the host specifically comprises a set of APD devices, a main processor and a processing circuit, each APD device is configured to be connected to a D probe through a first optical fiber bundle, and the D probe is kept to be connected with the first optical fiber bundle; the main processor and the processing circuitry are configured to be electrically connected to a set of APD devices; the S-probe is held in connection with a second optical fiber bundle or a second wire bundle so as to be connected to the host via the S-probe, the length of the first optical fiber bundle being 3 m or less, and the length of the second optical fiber bundle or the second wire bundle being also 3 m or less. Therefore, the head cap can be connected with the optical fiber bundle or the wire bundle which is less than 3 meters, so that the problems that the optical fiber bundle or the wire bundle is too long to cause light attenuation, is easy to break in the moving process and is inconvenient to carry are solved.

Description

Technical Field

[0001] This application relates to the technical field of near-infrared brain functional imaging, and specifically relates to an fnirs system and a debugging method that are compatible with an MRI imaging system and have an optimized harness length. Background Art

[0002] By combining magnetic resonance imaging (MRI) and near-infrared brain functional imaging (fnirs) for multimodal detection of the brain, more comprehensive brain activity information can be obtained. By combining MRI, it can help fnirs improve spatial resolution. Fnirs can measure the cerebral blood oxygen concentration that changes over time, indirectly reflecting the activation degree of the cerebral cortex, which can make up for MRI in terms of temporal resolution. In short, combining the two modalities of MRI and fnirs can more accurately diagnose and evaluate the brain function state.

[0003] However, the existing methods for combining the two modalities of MRI and fnirs can be referred to Figure 1 . The host computer, upper computer, etc. are placed in the control room. Waveguide holes are opened on the wall of the scanning room. The optical fibers or wires connected to the headgear worn by the subject are directly connected to the host computer outside the scanning room via these waveguide holes. Among them, the control room is far from the subject's head, and the length of the optical fibers or wires connected to the headgear worn by the subject will inevitably reach 4 - 5 meters, and even up to 10 meters. The longer optical fibers will be very heavy and will cause significant optical attenuation, reducing the accuracy of fnirs detection.

[0004] In addition, in the case where the subject needs to cooperate with the EEG (electroencephalogram) and PET (positron emission tomography) modalities, the subject needs to drag the optical fiber up to 5 meters to 10 meters long to first debug the probes on the headgear and the fnirs detection signal in the control room, then drag the long optical fiber to the treatment room to inject medicine, and finally return to the scanning room, which is extremely inconvenient. Due to the long length of the optical fiber, it is often necessary to drag the optical fiber to move, and the long optical fiber is prone to breakage during the dragging process due to its large self-weight. Therefore, the current fnirs system combined with MRI still has problems such as poor usability, poor stability, and low accuracy of detection results.

[0005] In particular, after the subject enters the scanning room with an optical fiber up to 5 meters to 10 meters long, it is still necessary to debug before the detection starts. Since the debugging of the probes on the headgear and the fnirs detection signal itself takes time, coupled with the problems of poor stability and low detection accuracy of the long optical fiber, the debugging efficiency will be significantly reduced. Summary of the Invention

[0006] In view of the above technical problems existing in the prior art, the present application is proposed. The present application provides an fnirs system and a debugging method that are compatible with an MRI imaging system and have an optimized harness length, which can limit the lengths of the optical fiber bundle and the wire bundle connected to the headgear to less than 3 meters. This can not only reduce light attenuation and improve the accuracy of fnirs detection, but also reduce the self-weight of the optical fiber bundle and the wire bundle, improve the portability of the subject carrying the optical fiber bundle and the wire bundle connected to the headgear for movement, and reduce the possibility of breakage, so as to be better compatible with MRI and provide effective brain activity information. Moreover, the debugging method of the present application can significantly improve the debugging efficiency and improve the user experience of the subject while ensuring the detection accuracy.

[0007] According to the first aspect of the present application, there is provided an fnirs system that is compatible with an MRI imaging system and has an optimized harness length. The fnirs system includes a headgear, an SD probe group disposed on the headgear, and a host. Among them, the S probe is used to transmit near-infrared light to the subject, and the D probe is used to receive the near-infrared light from the subject. Neither the headgear nor the SD probe group contains ferromagnetic materials, so that they can be placed in the scanning hole of the MRI imaging system. The host specifically includes a group of APD devices, a main processor, and a processing circuit. Among them, each APD device is respectively configured to be connected to the corresponding D probe on the headgear via a first optical fiber bundle. The D probe remains connected to the first optical fiber bundle to receive the near-infrared light emitted from the subject's head and convert it into an electrical signal. The main processor and the processing circuit are configured to be electrically connected to the group of APD devices to process the electrical signal to obtain fnirs detection data. Among them, the S probe remains connected to a second optical fiber bundle or a second wire bundle to be connected to the host via it. The length of the first optical fiber bundle is less than 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also less than 3 meters.

[0008] According to the second solution of the present application, there is provided a debugging method for an fnirs system that is compatible with an MRI imaging system and has an optimized wire harness length. The debugging method includes setting a test host in a scanning room equipped with an MRI imaging system, and setting a debugging host in a target area outside the scanning room; after plugging a second optical fiber bundle or a second wire bundle that is kept connected to the S probe on the headgear worn by the subject into the debugging host, and plugging a first optical fiber bundle that is kept connected to the D probe on the headgear into the debugging host, performing a first fnirs detection, where the length of the first optical fiber bundle is less than 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also less than 3 meters; obtaining the first fnirs detection data transmitted by the debugging host, and debugging the fitting condition of each probe on the headgear with the scalp of the subject based on the first fnirs detection data; after the debugging is completed, unplugging the optical fiber bundle or the wire bundle plugged into the debugging host, and plugging the second optical fiber bundle or the second wire bundle that is kept connected to the S probe into the test host, and plugging the first optical fiber bundle that is kept connected to the D probe into the test host, and then performing a second fnirs detection again; obtaining the second fnirs detection data transmitted by the test host, and debugging the fitting condition of each probe on the headgear with the scalp of the subject based on the second fnirs detection data.

[0009] Compared with the prior art, the beneficial effects of the embodiments of the present application are as follows: The fnirs system provided by the embodiments of the present application that is compatible with an MRI imaging system and has an optimized wire harness length includes a headgear, an SD probe group configured on the headgear, and a host. Among them, the host includes a group of APD devices, and each APD device is respectively configured to be connected to the corresponding D probe on the headgear via a first optical fiber bundle. The S probe is kept connected to a second optical fiber bundle or a second wire bundle, and is connected to the host via the second optical fiber bundle or the second wire bundle. And, the length of the first optical fiber bundle is less than 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also less than 3 meters. In this way, both the first optical fiber bundle and the second optical fiber bundle, or the first optical fiber bundle and the second wire bundle are limited to less than 3 meters, greatly shortening the length of the optical fiber bundle and the wire bundle connected to the headgear, effectively reducing the optical attenuation of the optical fiber bundle, and being beneficial to improving the accuracy and stability of fnirs detection.

[0010] Moreover, in the scenario where the subject needs to move while carrying the optical fiber connected to the headgear, by limiting both the optical fiber bundle and the wire bundle connected to the headgear to less than 3 meters in the embodiments of the present application, the self-weight of the optical fiber bundle and the wire bundle can be effectively reduced, the portability of movement can be greatly improved, the possibility of the optical fiber bundle breaking during movement can be significantly reduced, and the physical and mental burdens of the subject can be effectively reduced.

[0011] In particular, the subject can carry a short optical fiber or wire outside the scanning room and debug the probe on the headgear and the fnirs detection signal through the debugging host. After debugging, the subject carries the short optical fiber or wire back into the scanning room and plugs the optical fiber or wire into the test host placed in the scanning hole for micro-debugging again. It can be seen that based on the debugging method of the fnirs system provided in the embodiments of the present application, the debugging efficiency of debugging the probe on the headgear and the fnirs detection signal can be significantly improved, the debugging time of the subject in the scanning room can be greatly shortened, and the user experience of the subject can be improved.

[0012] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above description and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In the drawings, which are not necessarily to scale, the same reference numerals may describe similar components in different views. Similar reference numerals with alphabetical suffixes or different alphabetical suffixes may represent different examples of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used together with the specification and the claims to explain the disclosed embodiments. Such embodiments are illustrative and exemplary and are not intended to be an exhaustive or exclusive embodiment of the method, apparatus, system, or non-transitory computer-readable medium having instructions for implementing the method.

[0014] Figure 1 A schematic structural diagram of a fnirs system compatible with an MRI imaging system according to the prior art is shown.

[0015] Figure 2 A schematic diagram of a fnirs system compatible with an MRI imaging system and having an optimized harness length placed in a scanning hole according to an embodiment of the present application is shown.

[0016] Figure 3 A schematic structural diagram of a host in a fnirs system compatible with an MRI imaging system and having an optimized harness length according to an embodiment of the present application is shown.

[0017] Figure 4 Another schematic structural diagram of a host in a fnirs system compatible with an MRI imaging system and having an optimized harness length according to an embodiment of the present application is shown.

[0018] Figure 5 A schematic diagram of the spatial variation of the gradient magnetic field in an MRI imaging system according to an embodiment of the present application is shown.

[0019] Figure 6 Shows a schematic diagram of the placement of the host in the scan hole in a fnirs system that is compatible with an MRI imaging system according to an embodiment of the present application and has an optimized harness length.

[0020] Figure 7 Shows another schematic structural diagram of a fnirs system that is compatible with an MRI imaging system according to an embodiment of the present application and has an optimized harness length.

[0021] Figure 8 Shows a schematic structural diagram of a beam interface, an optical fiber bundle connector, and a wire harness connector provided according to an embodiment of the present application.

[0022] Figure 9 Shows a schematic structural diagram of the first mounting bracket inside the host according to an embodiment of the present application.

[0023] Figure 10 Shows another schematic structural diagram of a fnirs system that is compatible with an MRI imaging system according to an embodiment of the present application and has an optimized harness length.

[0024] Figure 11 Shows a flowchart of a debugging method for a fnirs system that is compatible with an MRI imaging system according to an embodiment of the present application and has an optimized harness length. Detailed implementation manners

[0025] To enable those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation to the present application.

[0026] The "first", "second", and similar terms used in the present application do not indicate any order, quantity, or importance, but are only used for distinction and convenience in expression, and do not strongly limit that "first" and "second" must be different. Among them, "first" and "second" can be interchanged. The terms "including" or "comprising" and similar terms used in the present application mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements. In the present application, the arrows shown in the figures for each step are only examples of the execution order and do not limit. The technical solutions of the present application are not limited to the execution order described in the embodiments. The steps in the execution order can be executed together, can be decomposed, and can be reordered, as long as the logical relationship of the execution content is not affected.

[0027] All terms used in this application (including technical or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here. Technologies and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.

[0028] In some embodiments of the present application, there is provided a fnirs system that is compatible with an MRI imaging system and has an optimized harness length. The fnirs system will be described in combination with Figures 2 - 4 the description of the fnirs system.

[0029] The fnirs system includes a headcap 201 and an SD probe group 202 disposed on the headcap 201. The S probes and D probes in the SD probe group 202 have different functions. Among them, the S probes are used to transmit near-infrared light to the subject, and the D probes are used to receive near-infrared light from the subject. Neither the headcap 201 nor the SD probe group 202 contains ferromagnetic materials, so they can be placed inside the scanning hole of the MRI imaging system to avoid ferromagnetic materials interfering with the magnetic field distribution, affecting the normal imaging of the MRI device, and affecting the accuracy and stability of the detection.

[0030] The fnirs system further includes a host 203. The host 203 specifically includes a group of APD devices 301, a main processor 303, and a processing circuit 302. Among them, each APD device is respectively configured to be connected to the corresponding D probe on the headcap via a first fiber bundle. The D probe remains connected to the first fiber bundle to receive the near-infrared light emitted from the subject's head and convert it into an electrical signal.

[0031] Specifically, each APD device, i.e., an Avalanche Photodiode, is connected to the corresponding D probe on the headcap through the first fiber bundle. It can be understood that the APD device can be directly connected to the corresponding D probe on the headcap through the first fiber bundle, that is, the D probe remains connected to the first fiber bundle, and the APD device is also directly connected to the first fiber bundle; or, the APD device can be indirectly connected to the corresponding D probe on the headcap through the first fiber bundle, that is, the D probe remains connected to the first fiber bundle, and the APD device is indirectly connected to the first fiber bundle. For example, a coupling device and another fiber bundle are added between the APD device and the first fiber bundle, etc. The embodiments of the present application do not specifically limit the connection method between the APD device and the first fiber bundle. The fiber bundle has good light transmission characteristics and can efficiently transmit the near-infrared light emitted from the corresponding D probe of the subject's headcap to the APD device. This connection method can ensure that the loss of near-infrared light during transmission is small, and can accurately guide the near-infrared light to the corresponding APD device for detection, while reducing the mutual interference between the lines (because it is a fiber bundle) exposed in the scanning hole and the magnetic field.

[0032] In this embodiment, the host 203 further includes a main processor 303 and a processing circuit 302, and the main processor 303 and the processing circuit 302 are configured to be electrically connected to the group of APD devices 301 to process the electrical signals to obtain fnirs detection data.

[0033] Specifically, after the APD device converts the received near-infrared light emitted from the subject's head into electrical signals, these electrical signals are transmitted to the main processor 303 and the processing circuit 302 through electrical connection. These electrical signals contain physiological information related to the subject's head tissue, but the electrical signals may be relatively weak and may be mixed with noise and other interference factors. The main processor 303 and the processing circuit 302 perform a series of processing operations on the received electrical signals, including: amplifying the signal to increase the signal strength to a level that can be effectively analyzed; filtering operations to remove high-frequency noise or other irrelevant interference components in the signal and improve the signal quality; analog-to-digital conversion to convert the continuous analog electrical signal into a digital signal for further analysis and processing by a computer or other digital processing devices. In addition, it may also include processing steps such as feature extraction and data correction of the signal to highlight the feature information related to fnirs detection.

[0034] In some embodiments of the present application, the S-probe remains connected to a second optical fiber bundle or a second wire bundle to be connected to the host 203 via it. The length of the first optical fiber bundle is below 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also below 3 meters. It can be understood that the connection manner between the second optical fiber bundle or the second wire bundle and the host 203 can be a direct connection or an indirect connection, such as adding a coupling device and another section of optical fiber bundle or wire bundle, etc. The present application embodiments do not specifically limit the connection manner between the second optical fiber bundle or the second wire bundle and the host 203.

[0035] For the convenience of description, the second optical fiber bundle, the second wire bundle, and the first optical fiber bundle can be collectively referred to as cables.

[0036] Since the length of the cable is controlled below 3 meters, optical attenuation can be effectively reduced, and the accuracy of fnirs detection can be improved. When the subject wears the headcap 201 connected with the cable and moves inside and outside the scanning room, since the cable length is less than 3 meters, the self-weight of the cable is reduced, and the cable can be effectively prevented from breaking during the dragging process, and the subject can enter and exit the scanning room more conveniently. In some embodiments, the second optical fiber bundle or the second wire bundle kept connected to the S-probe, and the first optical fiber bundle kept connected to the D-probe are detachably plugged into the host. That is to say, the cable kept connected to the probe on the headcap 201 worn by the subject is detachably plugged into the host 203. For example, when the subject lies in the scanning hole, the cable kept connected to the probe on the headcap 201 is inserted into the host 203, and when the subject is about to leave the scanning room, the cable plugged into the host 203 can be directly unplugged to disconnect the connection between the cable and the host 203, improving the operation convenience.

[0037] In some embodiments, the host 203 is encapsulated in a shielding housing 304 and placed within a predetermined space range around the isocenter in the scanning hole of the MRI imaging system. The shielding housing 304 is made of non-ferromagnetic metal. Metals such as aluminum, copper, gold, and silver are all non-ferromagnetic metals. In a preferred embodiment, the non-ferromagnetic metal is aluminum. Aluminum metal is inexpensive, has a small density and a light mass, and is convenient for installation and movement. Making the shielding housing 304 with aluminum can effectively shield the strong magnetic field generated by the MRI imaging system and the electromagnetic waves in the surrounding environment.

[0038] Figure 2 The situation of placing the host 203 in the scanning hole is shown. In some embodiments, the size of the shielding housing 304 is adapted to operate within the surrounding space range of the isocenter in the scanning hole of the MRI imaging system.

[0039] During the process of MRI image acquisition, the gradient magnetic field plays a crucial role in spatial localization. By applying gradient magnetic fields in three directions (usually the x-direction (transverse), y-direction (height direction), and z-direction (longitudinal)), the signal characteristics at different positions in space are made different. Refer to Figure 5 , the intensity of the gradient magnetic field varies with the radial distance from the isocenter (the distance from the isocenter on the x-y cross-section). The intensity of the gradient magnetic field is the smallest at the isocenter, and the farther away from the isocenter, the more obvious the change in the gradient magnetic field. The rate of change of the magnetic field intensity is the largest at the edge of the gradient coil.

[0040] The size of the shielding housing 304 is adapted to operate within the peripheral space range of the isocenter in the scan hole of the MRI imaging system, so as to place the main unit 203 as centered as possible in the scan hole. In this way, the magnetic field change at the position where the main unit 203 is located is smoother, and the induced electromagnetic force and eddy current are smaller. Thus, the influence of the electromagnetic force on the main unit 203 can be reduced, and the components of the main unit 203 can be prevented from being displaced or damaged due to the force. At the same time, the heat generated by the eddy current and the interference to the MRI magnetic field are also reduced, which is beneficial to ensuring the normal operation of the fnirs device and the quality of the MRI image.

[0041] Exemplarily, a support platform can also be provided within the peripheral space range of the isocenter in the scan hole to place related devices such as an electroencephalogram amplifier used in combination with the MRI system, such as Figure 2 and Figure 6 shown. The support platform is raised from the bottom of the scan hole, so that the electroencephalogram amplifier and the main unit 203 placed on the support platform are closer to the center of the scan hole.

[0042] In some embodiments, the packages of the respective APD devices are made of non-ferromagnetic materials to avoid interfering with the magnetic field intensity of the MRI imaging system, affecting the imaging quality, and avoiding damaging the device or causing harm to the subject. The metal used for the pins or coatings of the respective APD devices is a first non-ferromagnetic metal.

[0043] In some embodiments, the metals used for the electrical devices and electrical connection lines of the main processor 303 and the processing circuit 302 are a second non-ferromagnetic metal.

[0044] In some embodiments, the first non-ferromagnetic metal and the second non-ferromagnetic metal are copper. Copper has a higher electrical conductivity, generates less eddy current and less heat under a changing magnetic field, and has a smaller difference in magnetic permeability from air, which can reduce magnetic field interference, eddy current effects, heat generation, and signal artifacts.

[0045] The complete site layout of the MRI imaging system mainly includes a control room where MRI professionals operate the MRI equipment (also known as the operating room), a scanning room directly opposite and connected to the control room (where patients undergo scans, also known as the scanning chamber), and a machine room next to the scanning room (which houses various cabinets related to MRI, including the radio frequency transmission system, gradient transmission system, radio frequency reception and reconstruction system, as well as the magnetic body refrigeration system and power supply, also known as the equipment room). This site layout sometimes also includes a workstation (where doctors view and analyze MRI images) and a treatment room. Sometimes the workstation and the control room may also be integrated. When using modalities such as EEG and PET in conjunction with MRI, conductive gel or contrast agent is usually applied to the subject in the treatment room.

[0046] In some embodiments, the host 203 further includes a communication interface 305 configured to communicably connect to a host computer in the control room in a wired manner without introducing ferromagnetic materials to transmit fnirs detection data thereto.

[0047] That is to say, after a series of processes, the main processor 303 and the processing circuit 302 convert the original electrical signals into fnirs detection data, and the fnirs detection data is transmitted to the host computer in the control room in a wired manner through the communication interface 305 for the host computer to perform specific analysis based on the fnirs detection data to obtain physiological parameter-related values, waveforms or images such as blood oxygen parameters and blood flow changes.

[0048] In some embodiments, the host 203 further includes a light source unit that transmits near-infrared light to the corresponding S probes on the headgear 201 via the second optical fiber bundle, or a light source driving unit that is connected to the corresponding S probes on the headgear 201 via a second wire bundle to cause each near-infrared LED to emit near-infrared light. The light source unit or the light source driving unit 306 operates under the control of the main processor 303 and the processing circuit 302, and neither the light source unit nor the light source driving unit 306 contains ferromagnetic materials.

[0049] Specifically, when there are no electronic devices in the corresponding S probes on the headgear 201 worn by the subject, the light source unit emits near-infrared light and transmits the near-infrared light to the corresponding S probes on the headgear 201 via the second optical fiber bundle. When near-infrared LEDs are installed in the corresponding S probes on the headgear 201 worn by the subject, the light source driving unit can transmit driving signals to each near-infrared LED at the corresponding S probes on the headgear 201 via the second wire bundle, and each near-infrared LED generates near-infrared light based on the driving signals.

[0050] Among them, the main processor 303 and the processing circuit 302 can generate corresponding control logics and instructions according to a preset program or algorithm, and these instructions will be transmitted to the light source unit or the light source driving unit 306 to drive the near-infrared LED to emit light according to the instructions.

[0051] In some embodiments, such as Figure 4 , the processing circuit 302 includes an anti-aliasing filter 310, and the anti-aliasing filter 310 is configured to perform a low-pass operation with a cut-off frequency lower than the lower limit of the radio frequency (RF) signal frequency emitted when the MRI imaging system operates and higher than twice the upper limit of the near-infrared brain functional imaging detection signal frequency, and the stopband attenuation is greater than a predetermined dB number. When the MRI imaging system operates, it will emit RF signals, and the frequency range of these signals is relatively wide. The anti-aliasing filter 310 is set with a cut-off frequency lower than the lower limit of the RF signal frequency emitted when the MRI imaging system operates to effectively prevent the RF signals of the MRI from entering the processing circuit 302 of the host 203 and avoid interfering with the near-infrared brain functional imaging detection signals.

[0052] The cut-off frequency of the anti-aliasing filter 310 is set higher than twice the upper limit of the near-infrared brain functional imaging detection signal frequency. In this way, when sampling and processing the detection signals, it can ensure the integrity and accuracy of the signals, prevent high-frequency noise and other interference signals from passing through the filter, thereby improving the signal-to-noise ratio and resolution of the system and ensuring the quality of the near-infrared brain functional imaging detection signals. For example, the cut-off frequency of the anti-aliasing filter 310 can be set between 100 Hz and 10 kHz, which can well filter out the RF signals of the MRI and well retain the near-infrared brain functional imaging detection signals.

[0053] In some embodiments, the processing circuit 302 further includes an amplifier and an analog-to-digital converter 311. The amplifier is used to receive differential input signals to suppress the common-mode interference brought by the MRI magnetic field. When the amplifier receives differential input signals, it will perform a subtraction operation on the two input signals. Since the common-mode interference is basically the same in magnitude and phase on the two lines, the common-mode interference signal will be greatly weakened or even completely cancelled during the subtraction process. And the useful differential signals will be amplified normally. In this way, the amplifier effectively suppresses the common-mode interference brought by the MRI magnetic field through the processing of the differential input signals and improves the quality and stability of the signals.

[0054] In some embodiments, the processing circuit 302 further includes an electrostatic discharge protection unit 309, and the electrostatic discharge protection unit 309 is configured to prevent electrostatic hazards caused by the insertion of the second wire harness and ensure the normal operation of the system and the stability of signal transmission.

[0055] The electrostatic discharge protection unit 309 can limit the voltage and current during electrostatic discharge by adopting a series of electrostatic protection measures, such as installing electrostatic discharge resistors, transient voltage suppression diodes (TVS), etc. When static electricity is generated and accumulates to a certain extent, the electrostatic discharge protection unit 309 can quickly guide the static electricity to the ground or limit the transient high voltage generated by the electrostatic discharge within a safe range, thereby protecting the electronic components from electrostatic hazards and ensuring the normal operation of the system and the stability of signal transmission.

[0056] Exemplarily, as Figure 2 shown, when the host 203 is placed at the isocenter position within the scanning hole, the host needs to be encapsulated in a shielding housing at this time. A cable with a length of less than 3 meters can maintain connections with each probe on the headcap 201 while also connecting to the host 203. Since the length of the cable is limited to less than 3 meters, the load on the subject's head is reduced. After the subject wears the headcap, they can easily detach from the host 203 or directly carry the host 203 to move freely inside and outside the scanning room.

[0057] Specifically, the connection between the host 203 and the upper computer for communication can be disconnected, and the host 203 and the cable remain connected. At this time, the subject can carry the host 203 in and out of the control room and debug each probe on the headcap 201 worn by the subject in the control room. In the case where the subject needs to cooperate with the EEG and PET modalities, after debugging, the subject still needs to carry the cable to the treatment room to receive an injection, and then enter the scanning room while maintaining the wearing posture, place the host 203 in place within the scanning hole, and connect the host 203 and the upper computer.

[0058] Placing the host 203 within the scanning hole greatly shortens the length of the wire connecting the SD probe group 202 on the headcap 201 and the host 203. The length of the wire can be less than 3 meters, such as only 2.5 meters, 2 meters, 1.5 meters, 1 meter, or 0.5 meters. Since the length of the cable is controlled within 3 meters, it can effectively reduce optical attenuation, improve the accuracy of fnirs detection, and is more convenient to use.

[0059] In some other embodiments, the fnirs system includes a near-infrared light coupling device, as Figure 7 shown, the near-infrared light coupling device 701 is placed inside the scanning room and connected to the host 203. A second optical fiber bundle or a second wire bundle that maintains a connection with the S probe, and a first optical fiber bundle that maintains a connection with the D probe are detachably plugged into the near-infrared light coupling device 701.

[0060] Specifically, the host 203 can be placed in the control room. Waveguide holes can be opened on the wall of the scanning room so that the cables connected to the host 203 pass through the waveguide holes and are connected to the near-infrared light coupling device 701 in the scanning room. Among them, the near-infrared light coupling device 701 placed in the scanning room can serve as an adapter. The second optical fiber bundle or the second wire bundle connected to the S probe and the first optical fiber bundle connected to the D probe are only the cables from the SD probe group 202 to the near-infrared light coupling device 701, and the lengths of these cables are all less than 3 meters. The placement position of the near-infrared light coupling device 701 in the scanning room can be fixed, and there is no need to move the near-infrared light coupling device 701 arbitrarily. Therefore, there is no limit on the length of the cable for the communication connection between the near-infrared light coupling device 701 and the host 203. In order to minimize light attenuation as much as possible, the cable length between the near-infrared light coupling device 701 and the host 203 should be as short as possible.

[0061] In this embodiment, even if the host 203 is not placed in the scanning room, by setting the near-infrared light coupling device 701 as an adapter in the scanning room, the cable connected to the probe on the headgear worn by the subject only needs to be plugged into the near-infrared light coupling device 701. At this time, the length of the cable can still be controlled to be less than 3 meters. When the subject needs to go to areas such as the control room or the treatment room outside the scanning room, the cable can be directly unplugged from the near-infrared light coupling device 701, and the subject can wear the headgear together with the cable and conveniently enter and exit the scanning room.

[0062] Exemplarily, taking the S probe connected to the second optical fiber bundle as an example, inside the near-infrared light coupling device 701, a light guiding member between a pair of input optical fibers - output optical fibers can be set. The function of the light guiding member is to guide the optical signal to be transmitted between the input optical fiber and the output optical fiber, ensuring that the optical signal can accurately be transmitted from the first optical fiber bundle connected to the D probe to the optical fiber bundle part connected to the host 203 or the optical signal can be transmitted from the optical fiber bundle part connected to the host 203 to the second optical fiber bundle connected to the S probe, realizing the effective transmission of the optical signal. At the same time, a limiting structure can also be set inside the near-infrared light coupling device 701 to maintain the fixed optical coupling relationship between the input optical fiber - light guiding member - output optical fiber. That is to say, the limiting structure can ensure the relative positions of these three are stable, ensuring that the optical signal will not be interfered during the transmission process due to the movement or misalignment of the components, thereby maintaining the stability and accuracy of the system optical signal transmission and making the detection results more reliable. When the S probe is connected to the second wire bundle, only a set of light guiding members set inside the near-infrared light coupling device 701 needs to be changed to a set of conductive members to ensure that the electrical signal can be transmitted from the wire bundle part connected to the host 203 to the second wire bundle connected to the S probe, which will not be elaborated here.

[0063] In some embodiments, only a limiting structure may be provided between the input optical fiber and the output optical fiber inside the near-infrared light coupling device 701. The input optical fiber and the output optical fiber are directly optically coupled to achieve the transmission of optical signals, and the limiting structure maintains the fixed optical coupling relationship between the input optical fiber and the output optical fiber.

[0064] In some embodiments, the distal ends of the second optical fiber bundle or the second wire bundle connected to the S probe and the first optical fiber bundle connected to the D probe are gathered into a bundled joint head, where the "distal end" is only used to represent the direction relative to the position of the probe. For example, the direction close to the position of the probe is the proximal end, and the direction away from the position of the probe is the distal end. "Near" and "far" can vary according to different reference positions. The bundled joint head can be split or integrated into one body, and the embodiments of the present application do not make specific limitations on this.

[0065] Specifically, as Figure 8 shown, the bundled joint head includes an array of wire bundle joints 802 and optical fiber bundle joints 801. The optical fiber bundle joint 801 may only include the first optical fiber bundle joint, or may include the first optical fiber bundle joint and the second optical fiber bundle joint. Among them, when the optical fiber bundle joint 801 includes the first optical fiber bundle joint and the second optical fiber bundle joint, the arrangement positions of the first optical fiber bundle joint and the second optical fiber bundle joint are not limited, and can be arranged according to the connection positions and quantities of the first optical fiber bundle and the second optical fiber bundle to the probes on the headcap.

[0066] Among them, the wire bundle joint 802 may only be the second wire bundle joint. For example, when the second wire bundle is connected to the S probe, the bundled joint head includes the wire bundle joint 802 formed by gathering the distal ends of the second wire bundle and the optical fiber bundle joint 801 formed by gathering the distal ends of the first optical fiber bundle.

[0067] Specifically, the bundled joint head is detachably plugged into the bundled interface part of the near-infrared light coupling device. The bundled interface part includes an array of bundled interfaces 803, where the bundled interface 803 corresponds to each joint in the bundled joint head one by one.

[0068] Figure 8 The bundled interface 803 shown in includes an optical fiber bundle interface corresponding to the optical fiber bundle joint 801 one by one and a wire bundle interface corresponding to the wire bundle joint 802 one by one. Of course, when the second optical fiber bundle is connected to the S probe, the bundled joint head may only include the optical fiber bundle joint 801, and the bundled interface 803 may only have an optical fiber bundle interface without setting a wire bundle interface. Only as an example, the bundled interface 803 can be set according to the bundled joint head.

[0069] In some embodiments, the fiber optic bundle connector 801 includes a second mounting bracket 805 and a set of fiber optic structure heads 804 integrally formed therewith; alternatively, the fiber optic bundle connector 801 includes a second mounting bracket 805 and a set of fiber optic structure heads 804 detachably screwed onto the second mounting bracket 805. Each fiber optic structure head 804 has a fiber fixed therein, and the second mounting bracket 805 is further provided with at least two screws. The fiber optic bundle interface is provided with a set of notches corresponding one-to-one to the fiber optic structure heads 804 and at least two threaded holes. When the fiber optic structure heads 804 are all inserted into the corresponding notches, the screws are screwed into the corresponding threaded holes to complete the firm plugging of the fiber optic bundle connector 801 and the fiber optic bundle interface.

[0070] By providing a bundled connection head at the far end of the cable and a bundled interface portion on the near-infrared light coupling device, not only can the cable be conveniently plugged and unplugged on the near-infrared light coupling device, but also it can be ensured that the cable is correctly plugged into the near-infrared light coupling device, maintaining the stability of the connection between the cable and the near-infrared light coupling device, and avoiding problems such as incorrect cable insertion position leading to debugging errors and reduced debugging efficiency.

[0071] In some embodiments, the host further includes a first mounting bracket disposed inside the housing. The housing includes a shielded housing or a non-shielded housing. When the near-infrared light coupling device is placed in the scanning room and connected to the host, and the host is placed outside the scanning room, the housing of the host can be a non-shielded housing. The first mounting bracket is provided with slot holes, the APD is embedded at one end of the slot hole, and the inner wall of the slot hole is provided with limiting threads. The notches on the fiber optic bundle interface are provided corresponding one-to-one to the APD.

[0072] Exemplarily, as Figure 8 and Figure 9 , the light receiving end of the fiber optic structure head 804 can be connected to the D probe, and the light emitting end of the fiber optic structure head 804 can be inserted into the slot hole on the first mounting bracket 901 through the notch on the fiber optic bundle interface and directly connected to the APD 902. Among them, each fiber optic structure head 804 has a fiber fixed therein, and by inserting the fiber optic structure head 804 into the corresponding notch, an optical signal is transmitted to the APD 902.

[0073] Specifically, there can be a gap between the light emitting end of the fiber optic structure head 804 and the APD 902, and a filter can be provided in the gap therebetween to filter out interfering light other than near-infrared light.

[0074] The APD 902 can be stably installed through the first mounting bracket 901, so that the APD 902 and the fiber optic structure head 804 can maintain a relatively stable positional relationship.

[0075] The above-mentioned first mounting bracket 901 can be configured as a plate shape, and the slot holes formed thereon can be provided corresponding one-to-one to the APD 902.

[0076] Since the APD 902 generates heat during operation, and the magnetic field changes in the scanning room can also cause the metal to heat up, the temperature and heat itself will affect the working condition of the APD 902. The temperature sensor 903 can be used to monitor the heat generation of the APD 902 in real time. In some embodiments, the first mounting bracket 901 is made of a ceramic matrix composite material, polyimide or carbon fiber. These materials will not interfere with the magnetic field during the MRI scanning process, nor will they generate artifacts, and they all have good thermal conductivity and hardness, making them suitable for use in the MRI scanning room.

[0077] In some embodiments, a plurality of temperature sensors 903 are embedded in the first mounting bracket 901, and each APD 902 surrounds and is adjacent to the corresponding temperature sensor 903. In this way, by using the temperature sensor 903 to monitor the temperature of the heat conductor, i.e., the first mounting bracket 901, which has sufficient heat exchange with the APD 902, the temperature of the APD 902 can be indirectly monitored.

[0078] In some embodiments, the plate surface of the first mounting bracket 901 can be perpendicular to the axial direction of the fiber optic structure head 804.

[0079] Exemplarily, a threaded member can be sleeved on the light-emitting end of the fiber optic structure head 804, and the threaded member can be threadedly connected to the first mounting bracket 901, so that the fiber optic structure head 804 can be installed on the first mounting bracket 901 through the threaded member.

[0080] In some embodiments, a limiting thread is provided on the inner wall of the slot hole of the first mounting bracket 901, that is, after the threaded member of the fiber optic structure head 804 enters the position of the limiting thread, it cannot continue to enter inward. There is a certain gap, such as 1 mm, between the APD 902 embedded at one end of the slot hole and the limiting thread. In this way, through the positioning of the limiting thread, when the fiber optic structure head 804 is installed on the first mounting bracket 901, the problem of crushing the APD 902 due to pressing is avoided, and the distance between the APD 902 and the fiber optic structure head 804 can be limited, avoiding the influence on the optical coupling efficiency due to too large a distance.

[0081] In some embodiments, each wire of the second wire bundle includes a shielding layer, and the shielding layer is driven by a voltage follower. By using a voltage follower to drive the shielding layer, the potential fluctuation on the shielding layer can be effectively reduced, and the electromagnetic interference caused by the potential change can be reduced. At the same time, the high input impedance of the voltage follower can avoid generating a load effect on the connected circuit and ensure the stability of the reference voltage source or related potential. Driving the wire shielding layer through a voltage follower in the scanning room instead of directly grounding can more effectively suppress the common-mode interference signal brought by the strong magnetic field to the wire, ensure the transmission quality of the electrical signal, and improve the reliability and accuracy of the detection system.

[0082] In some other embodiments, as Figure 10 shown, the host 203 is placed in the machine room, and the fnirs system further includes a host computer 1001 in the control room. The MRI imaging system includes a scanning aperture.

[0083] Specifically, a scanning bed is placed in the scanning room, and the subject lies on the scanning bed and enters the scanning aperture so that the MRI imaging device can scan and image the subject. Among them, for the safety of the subject, usually during scanning, the subject's feet face the control room and the head faces the opposite side, so that the operator in the control room can conveniently see the subject and the operation of the equipment in the scanning room within the field of view. In this way, the magnet of the scanning bed is farther away from the control room, and the opposite side where the head faces is often arranged as the machine room, and the distance from the machine room usually does not exceed 3 meters.

[0084] Many machine rooms have waveguide holes pre-opened on the walls, and these waveguide holes can be directly used. Exemplarily, the host 203 can be directly placed in the machine room closer to the subject's head. At this time, the cable connected to the probe on the headcap worn by the subject passes through the waveguide hole and is connected to the host 203 in the machine room, or the length of the cable connected to the probe on the headcap can be limited to less than 3 meters. In this way, the various parts of the system can be better connected and coordinated, and it can be ensured that when the lengths of the first optical fiber bundle, the second optical fiber bundle, and the second wire bundle are all less than 3 meters, the fnirs system can cooperate with the MRI device conveniently, improving the detection efficiency and detection stability.

[0085] Figure 11 FIG. shows a flowchart of a debugging method for a fnirs system that is compatible with an MRI imaging system and has an optimized harness length. Specifically, for the debugging method, refer to step S1101-step S1105. Among them, the arrows shown in the figure for each step are only examples of the execution order and do not limit. The technical solution of the present application is not limited to the execution order described in the embodiments. The steps in the execution order can be combined, decomposed, and the order can be swapped as long as the logical relationship of the execution content is not affected.

[0086] In step S1101, a test host is set in the scanning room configured with the MRI imaging system, and a debugging host is set in the target area outside the scanning room. Among them, the target area can be the control room or a disposal room outside the control room, and there is no limitation thereto. Preferably, the target area is in the control room. And, the models of the test host and the debugging host are exactly the same.

[0087] In step S1102, after plugging the second optical fiber bundle or the second wire bundle that remains connected to the S probe on the headgear worn by the subject into the debugging host, and plugging the first optical fiber bundle that remains connected to the D probe on the headgear into the debugging host, a first fnirs detection is performed. The length of the first optical fiber bundle is less than 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also less than 3 meters.

[0088] In step S1103, obtain the first fnirs detection data transmitted by the debugging host, and based on the first fnirs detection data, debug the fitting condition of each probe on the headgear with the scalp of the subject. Specifically, the debugging host transmits the first fnirs detection data to the upper computer, and the upper computer performs data analysis based on the first fnirs detection data to obtain the signal intensity of each channel corresponding to each probe on the headgear, and analyzes the fitting condition of each probe with the scalp of the subject according to the signal intensity of each channel. Exemplarily, for example, when the signal intensity of the channel corresponding to a certain probe is weak, the probe can be gently pressed to make the probe fit the scalp.

[0089] In step S1104, after the debugging is completed, pull out the optical fiber bundle or wire bundle plugged into the debugging host, and after plugging the second optical fiber bundle or the second wire bundle that remains connected to the S probe into the test host, and plugging the first optical fiber bundle that remains connected to the D probe into the test host, perform a second fnirs detection again.

[0090] The debugging method of the fnirs system that is compatible with the MRI imaging system and has an optimized wire harness length provided by the embodiments of the present application is applicable to the fnirs system that is compatible with the MRI imaging system and has an optimized wire harness length described in each embodiment of the present application.

[0091] Specifically, both the optical fiber bundle and the wire bundle are less than 3 meters, and the subject can conveniently carry the optical fiber bundle and the wire bundle in and out of the scanning room. After the subject adjusts the fitting condition of each probe on the headgear with the scalp in the target area, the cable connected to the debugging host is unplugged. At this time, the subject can easily carry the optical fiber bundle and the wire bundle from the target area into the scanning room, and plug the cable into the test host in the scanning room again to perform a second fnirs detection.

[0092] In step S1105, obtain the second fnirs detection data transmitted by the test host, and based on the second fnirs detection data, debug the fitting condition of each probe on the headgear with the scalp of the subject. That is to say, after the subject returns to the scanning room, only fine-tuning of each probe on the headgear needs to be performed according to the second fnirs detection data, without entering the scanning room and starting the debugging from scratch, thereby reducing the debugging time and improving the debugging efficiency.

[0093] During this entire process, since the length of the cable is restricted to less than 3 meters, it is not only possible to avoid cable breakage when the subject enters and exits the scanning room, but also to reduce optical attenuation and improve the convenience of the subject carrying the cable to move. Moreover, generally speaking, when there are a large number of subjects waiting for debugging, queuing is often required. Based on the debugging method provided in the embodiments of the present application, the subject can be debugged during the waiting period of the previous person's detection, and only fine-tuning is required after entering the scanning room later, which greatly shortens the detection time, improves the utilization rate of the MRI system, overall improves the debugging efficiency and debugging accuracy, and improves the subject's usage experience.

[0094] In some other embodiments, the debugging method further includes: a host is provided in a target area outside the scanning room. For example, a near-infrared light coupling device is provided in the scanning room, and the near-infrared light coupling device is connected to the host in the control room; or the host is provided in a disposal room outside the control room. After the subject debugs the fnirs system in the control room or the disposal room outside the control room and enters the scanning room for testing, at this time, the host provided in the target area outside the scanning room can serve as both a debugging host and a testing host.

[0095] Specifically, taking the host being provided in the control room as an example, when the subject is waiting in the control room, after debugging the fitting condition of each probe on the headgear with the scalp based on this host, the cable connected to this host is unplugged, and then the subject carries the optical fiber bundle and the wire bundle into the scanning room, plugs the cable into the near-infrared light coupling device in the scanning room, and after fine-tuning each probe on the headgear, the second fnirs detection can be performed. In this way, the debugging efficiency can also be improved.

[0096] In the above various embodiments, the processor may be a processing device including more than one general-purpose processing device, such as a microprocessor, a central processing unit (CPU), a graphics processing unit (GPU), etc. More specifically, the processor may be a complex instruction set computing (CISC) microprocessor, a reduced instruction set computing (RISC) microprocessor, a very long instruction word (VLIW) microprocessor, a processor running other instruction sets, or a processor running a combination of instruction sets. The processor may also be more than one dedicated processing device, such as an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a digital signal processor (DSP), a system-on-chip (SoC), etc.

[0097] This application describes various operations or functions, which can be implemented as software code or instructions or defined as software code or instructions. Such content can be source code that can be directly executed or differential code ("incremental" or "patch" code) ("object" or "executable" form). The software code or instructions can be stored in a computer-readable storage medium, and when executed, can cause a machine to perform the described functions or operations, and include any mechanism for storing information in a form accessible by a machine (e.g., a computing device, an electronic system, etc.), such as a recordable or non-recordable medium (e.g., read-only memory (ROM), random access memory (RAM), magnetic disk storage medium, optical storage medium, flash device, etc.).

[0098] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on this application having equivalent elements, modifications, omissions, combinations (e.g., schemes that cross various embodiments), adaptations or alterations. The elements in the claims will be broadly interpreted based on the language employed in the claims and are not limited to the examples described in this specification or during the implementation of this application, and the examples will be interpreted as non-exclusive. Thus, this specification and the examples are intended to be considered only as examples, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0099] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of their schemes) can be used in combination with each other. For example, those of ordinary skill in the art can use other embodiments when reading the above description. Additionally, in the above detailed description, various features can be grouped together to simplify this application. This should not be construed as an intention that a disclosed feature not claimed is necessary for any claim. On the contrary, the subject matter of this application can be less than all the features of a particular disclosed embodiment. Thus, the claims are incorporated herein as examples or embodiments into the detailed description, where each claim independently serves as a separate embodiment, and considering these embodiments, they can be combined with each other in various combinations or permutations. The scope of this application should be determined with reference to the appended claims and the full scope of the equivalent forms empowered by these claims.

[0100] The above embodiments are only exemplary embodiments of this application and are not used to limit this application. The protection scope of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of this application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of this application.

Claims

1. An fnirs system compatible with an MRI imaging system and having an optimized beam harness length, wherein, The described fnirs system includes: A headcap and an SD probe group configured on the headcap. The S probes are used to transmit near-infrared light to the subject, and the D probes are used to receive near-infrared light from the subject. Neither the headcap nor the SD probe group contains ferromagnetic materials, so that they can be placed inside the scanning hole of the MRI imaging system; and A mainframe, and specifically, the mainframe includes: A group of APD devices, each APD device is respectively configured to be connected to the corresponding D probe on the headcap via a first optical fiber bundle. The D probe remains connected to the first optical fiber bundle to receive the near-infrared light emitted from the subject's head and convert it into an electrical signal; A main processor and a processing circuit, which are configured to be electrically connected to the group of APD devices to process the electrical signal to obtain fnirs detection data, wherein, the S probe remains connected to a second optical fiber bundle or a second wire bundle to be connected to the mainframe via it. The length of the first optical fiber bundle is below 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also below 3 meters.

2. The fnirs system compatible with an MRI imaging system and having an optimized harness length according to claim 1, wherein The mainframe is encapsulated in a shielding housing to be placed within a predetermined space range around the isocenter inside the scanning hole of the MRI imaging system. The shielding housing is made of non-ferromagnetic metal.

3. The fnirs system compatible with an MRI imaging system and having an optimized harness length according to claim 1, wherein The second optical fiber bundle or the second wire bundle that remains connected to the S probe, and the first optical fiber bundle that remains connected to the D probe can be detachably plugged into the mainframe.

4. The fnirs system compatible with an MRI imaging system and having an optimized beam harness length according to claim 1, wherein The fnirs system further includes a near-infrared light coupling device. The near-infrared light coupling device is placed in the scanning room and connected to the mainframe. The second optical fiber bundle or the second wire bundle that remains connected to the S probe, and the first optical fiber bundle that remains connected to the D probe are detachably plugged into the near-infrared light coupling device.

5. The fnirs system according to claim 4, which is compatible with an MRI imaging system and has an optimized harness length, is characterized in that, The distal ends of the second optical fiber bundle or the second wire bundle that remains connected to the S probe, and the first optical fiber bundle that remains connected to the D probe are assembled into a bundled joint head, The bundled joint head includes an array of wire bundle joints and optical fiber bundle joints; The bundled joint head is detachably plugged into the bundled interface part of the near-infrared light coupling device. The bundled interface part includes an array of bundled interfaces, wherein the bundled interfaces correspond to each joint in the bundled joint head one by one.

6. The fnirs system compatible with an MRI imaging system and having an optimized harness length according to claim 1, wherein Each wire of the second wire bundle includes a shielding layer, and the shielding layer is driven by a voltage follower.

7. The fnirs system compatible with an MRI imaging system and having an optimized cable length according to claim 2, wherein The mainframe further includes: A communication interface, configured to be communicably connected to a host computer in the control room in a wired manner without introducing ferromagnetic materials to transmit fnirs detection data to it.

8. The fnirs system compatible with an MRI imaging system and having an optimized harness length according to claim 7, wherein The mainframe further includes: A light source part that transmits near-infrared light to the corresponding S probe on the headcap via the second optical fiber bundle, or a light source driving part that connects to each near-infrared LED at the corresponding S probe on the headcap via the second wire bundle to make it emit near-infrared light. The light source part or the light source driving part operates under the control of the main processor and the processing circuit, and neither the light source part nor the light source driving part contains ferromagnetic materials.

9. The fnirs system compatible with an MRI imaging system and having an optimized harness length according to claim 1, wherein The mainframe is placed in the machine room. The fnirs system further includes a host computer in the control room, and the MRI imaging system includes a scanning hole.

10. The fnirs system compatible with an MRI imaging system and having an optimized harness length according to claim 1, wherein, The processing circuit further includes: An electrostatic discharge protection unit configured to prevent electrostatic hazards caused by the plugging and unplugging of the second wire bundle; An anti-aliasing filter configured to perform a low-pass operation with a cut-off frequency lower than the lower limit of the RF signal frequency emitted during the operation of the MRI imaging system and higher than twice the upper limit of the near-infrared brain functional imaging detection signal frequency, and with a stopband attenuation greater than a predetermined dB number; An amplifier and an analog-to-digital converter, the amplifier being used to receive a differential input signal to suppress common-mode interference brought by the MRI magnetic field.

11. A debugging method for an fnirs system compatible with an MRI imaging system and having an optimized beam harness length, characterized in that, The debugging method includes: Setting a test host in the scanning room equipped with an MRI imaging system, and setting a debugging host in a target area outside the scanning room; After plugging the second optical fiber bundle or the second wire bundle that remains connected to the S probe on the headgear worn by the subject into the debugging host, and plugging the first optical fiber bundle that remains connected to the D probe on the headgear into the debugging host, performing a first fnirs detection, where the length of the first optical fiber bundle is less than 3 meters, and the length of the second optical fiber bundle or the second wire bundle is also less than 3 meters; Obtaining the first fnirs detection data transmitted by the debugging host, and debugging the fitting condition of each probe on the headgear with the scalp of the subject based on the first fnirs detection data; After the debugging is completed, unplugging the optical fiber bundle or the wire bundle plugged into the debugging host, and plugging the second optical fiber bundle or the second wire bundle that remains connected to the S probe into the test host, and plugging the first optical fiber bundle that remains connected to the D probe into the test host, and then performing a second fnirs detection again; Obtaining the second fnirs detection data transmitted by the test host, and debugging the fitting condition of each probe on the headgear with the scalp of the subject based on the second fnirs detection data.

Images