Control system and imaging method of magnetic resonance imaging equipment

Abstract

The invention provides a control system of magnetic resonance imaging equipment and an imaging method, and relates to the technical field of magnetic resonance imaging equipment control. The control system of the magnetic resonance imaging equipment comprises hardware composition equipment and a software control module, the hardware composition equipment comprises a scanning component and a magnetic resonance host, and the software control module comprises a scanning parameter setting unit, a sequence control unit, an image reconstruction unit and a system monitoring and feedback unit. According to the invention, the image reconstruction module in the control system adopts advanced mathematical algorithms, the algorithms can quickly and accurately convert the acquired radio frequency signals into high-quality images, and in the scanning process, the control system can process the images in real time, so that the contrast ratio of the images is more appropriate, and the image quality is improved. Therefore, an operator can conveniently observe the image quality in time in the scanning process and judge whether scanning parameters need to be adjusted or not, high-quality imaging is achieved, and then the reliability and safety of MRI imaging are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic resonance imaging equipment control, and in particular to a control system and an imaging method of a magnetic resonance imaging equipment. Background Art

[0002] Medical magnetic resonance imaging (MRI) is a non-invasive, radiation-free medical imaging technology that can provide clear and detailed images of the body's internal structure and function. The basis of MRI technology is the nuclear magnetic resonance (NMR) phenomenon. Nuclear magnetic resonance refers to the process in which the atomic nuclei in a static magnetic field undergo resonant transitions after being excited by radio frequency pulses of a certain frequency. After the radio frequency pulse stops, the atomic nuclei return to their original state and emit radio frequency signals.

[0003] As the requirements for image quality in medical diagnosis continue to increase, the control system of magnetic resonance imaging equipment needs to be able to generate more stable and uniform magnetic fields, more accurate gradient magnetic fields and radio frequency pulses. In addition, in clinical practice, the number of patients continues to increase. In order to improve inspection efficiency and shorten patient waiting time, the scanning speed of magnetic resonance imaging needs to be accelerated. This has prompted the control system to use more powerful gradient amplifiers and radio frequency transmitters in hardware to achieve rapid signal excitation and acquisition. Modern medical diagnosis requires not only observation of the anatomical structure of the human body, but also understanding of the physiological functions and metabolic information of tissues, which requires the control system of magnetic resonance imaging equipment to support more functional imaging modes.

[0004] The control system of early magnetic resonance imaging equipment was relatively simple. In terms of hardware, the gradient amplifier of the gradient system had low power, and the linearity and accuracy of the gradient magnetic field were poor, resulting in low spatial resolution of the image. The performance of the RF transmitter and receiver of the RF system was also limited, and the frequency stability and power control of the RF pulse were not precise enough, resulting in unsatisfactory signal excitation and reception effects. In terms of software, the early control system had fewer functions, and the setting range of scanning parameters was relatively narrow. Operators could only choose a limited number of scanning sequences. In addition, the image reconstruction algorithm was relatively simple, and the ability to process complex signals and remove artifacts was weak.

[0005] Therefore, those skilled in the art provide a control system and an imaging method for a magnetic resonance imaging device to solve the problems raised in the above background technology. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a control system and an imaging method for a magnetic resonance imaging device, which solve the problem that the control system of early magnetic resonance imaging devices is relatively simple and has poor functionality.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A control system for a magnetic resonance imaging device, comprising a hardware component device and a software control module, wherein the hardware component device comprises a scanning component and a magnetic resonance host, and the software control module comprises a scanning parameter setting unit, a sequence control unit, an image reconstruction unit, and a system monitoring and feedback unit;

[0011] The scanning components specifically include a gradient amplifier and a gradient coil, a radio frequency transmitter and a radio frequency receiver, and a magnet power supply and a control unit for a superconducting magnet;

[0012] The gradient amplifier receives the control signal from the host, converts it into a strong current, and drives the gradient coil to generate the required gradient magnetic field. The performance of the gradient amplifier directly affects the intensity, rise time and stability of the gradient magnetic field. In order to obtain high-resolution images, the gradient amplifier needs to be able to provide high-power, fast-switching current to generate steep gradient magnetic field changes;

[0013] The gradient coil is a key component for generating a gradient magnetic field. It is usually composed of three groups of coils in the X, Y, and Z directions that are perpendicular to each other. They are placed inside the magnet. These coils can generate a linearly changing magnetic field when driven by a gradient amplifier.

[0014] The radio frequency transmitter is mainly composed of a radio frequency power amplifier and a radio frequency pulse generator. The radio frequency pulse generator generates radio frequency pulse signals with specific frequency, bandwidth and pulse shape according to the scanning sequence set by the host, and the radio frequency power amplifier amplifies these signals to sufficient power to effectively excite hydrogen protons in human tissues;

[0015] The radio frequency receiver is used to receive the weak radio frequency signal emitted by human tissue after radio frequency pulse excitation, and includes a preamplifier, a mixer, and a filter component. The preamplifier first preliminarily amplifies the weak signal, then converts the signal into an intermediate frequency signal through the mixer, and then passes through the filter to remove noise and interference signals, and finally transmits the processed signal to the host for subsequent processing;

[0016] The magnet power supply and control unit is mainly responsible for providing a stable power supply and precise temperature control for the superconducting magnet. It ensures that the superconducting coil inside the magnet is always in a superconducting state by controlling the cooling system of liquid helium.

[0017] The magnetic resonance host includes a bed drive motor and a controller;

[0018] The bed drive motor is the power source for controlling the movement of the bed, and it can accurately adjust the position of the bed so that different parts of the patient's body can accurately enter the scanning area;

[0019] The controller controls the speed, direction and travel of the motor according to the instructions issued by the host.

[0020] Furthermore, the scanning parameter setting unit is an important interface for the operator to interact with the magnetic resonance imaging equipment control system. Through this module, the operator can set various scanning parameters, such as scanning sequence type (spin echo, gradient echo, fast spin echo, etc.), scanning site (head, neck, chest, abdomen, etc.), scanning layer thickness (ranging from a few millimeters to tens of millimeters), field of view size (determines the size of the scanning range), and matrix size (affects the resolution of the image).

[0021] Furthermore, the sequence control unit is responsible for controlling the execution of the scanning sequence. It coordinates the work of the gradient system, the radio frequency system and the signal acquisition system according to the sequence type set in the scanning parameter setting module and in accordance with the predetermined time sequence and parameters.

[0022] Furthermore, the image reconstruction unit converts the collected radio frequency signal into a visual image. It processes the signal using a Fourier transform mathematical algorithm. The specific processing process is as follows:

[0023] First, the collected signal is preprocessed, including signal amplification, filtering, phase correction and other operations to improve the signal quality;

[0024] Then, based on the spatial information encoded by the gradient magnetic field, the signal is converted from the time domain to the frequency domain through Fourier transform, thereby reconstructing an image reflecting the anatomical structure of human tissue.

[0025] Furthermore, the system monitoring and feedback unit is used to monitor the various subsystems of the entire magnetic resonance imaging device in real time. It can monitor key parameters such as the current and temperature of the gradient amplifier, the power and frequency of the radio frequency transmitter and receiver, the temperature of the magnet, and the magnetic field strength. When these parameters exceed the normal range, the system monitoring and feedback module will promptly issue an alarm and take corresponding measures, such as adjusting parameters and pausing scanning.

[0026] Furthermore, the control system also includes a signal acquisition module and a data processing module. The signal acquisition module includes an electromagnetic interference sensor, which is arranged on an examination bed matched with the magnetic resonance host and is used to collect surrounding electromagnetic interference signals. The data processing module analyzes the collected electromagnetic interference signals, and when the intensity of the electromagnetic interference signal exceeds a preset threshold, obtains the analysis results of the abnormal electromagnetic interference signal appearing around the magnetic resonance host.

[0027] Furthermore, the signal acquisition module also includes a magnetic field disturbance sensor, which is arranged on the magnetic resonance host and is used to collect magnetic field disturbance signals around the magnetic resonance host. The data processing module analyzes the collected magnetic field disturbance signals, and when the intensity of the magnetic field disturbance signal exceeds a preset threshold, obtains the analysis result of the abnormal magnetic field disturbance signal appearing around the magnetic resonance host.

[0028] Furthermore, an imaging method of a magnetic resonance imaging device comprises the following steps:

[0029] Step S1. First, remove metal objects on the patient, because metal will cause interference in the magnetic field, affect the image quality and may even cause harm to the patient;

[0030] Step S2. Then, the patient lies on the bed, and the operator moves the patient to a suitable position near the center of the magnet through the bed control system;

[0031] Step S3. The operator sets the scanning parameters on the main computer system. The selection of the scanning sequence depends on the scanning purpose and part. At the same time, the scanning layer thickness, layer spacing, field of view, matrix size and other parameters need to be set;

[0032] Step S4. The magnet system generates a stable main magnetic field, which causes the hydrogen protons in the human tissue to precess along the magnetic field direction. Then, the gradient control system generates a gradient magnetic field according to the set parameters for spatial positioning. Then, the radio frequency control system emits radio frequency pulses to excite the hydrogen protons at a specific level.

[0033] Step S5. After being excited by the radio frequency pulse, the hydrogen protons will relax and emit radio frequency signals during the relaxation process. The radio frequency receiver receives these signals and transmits them to the main computer system;

[0034] Step S6. The main computer system performs pre-processing operations such as amplification and filtering on the collected signals, and then reconstructs the image through a complex mathematical algorithm. During the image reconstruction process, the information encoded by the gradient magnetic field is used to convert the radio frequency signal into an image reflecting the anatomical structure and physiological state of human tissue;

[0035] Step S7. The reconstructed image is displayed on the monitor of the main computer system, and then the operator evaluates the image to check the image quality, whether there are artifacts, and whether the region of interest is fully displayed;

[0036] Step S8. Qualified images are stored in the computer's storage device for subsequent diagnosis and research.

[0037] Furthermore, after the image is evaluated in step S7, if the image quality does not meet the requirements, it is necessary to adjust the scanning parameters and re-scan.

[0038] Furthermore, after step S8, the stored images can also be transmitted via the network to other medical devices, such as a PACS system - medical image storage and communication system, for remote diagnosis or consultation.

[0039] (III) Beneficial effects

[0040] The present invention provides a control system and imaging method for a magnetic resonance imaging device, which has the following beneficial effects:

[0041] 1. The present invention provides a control system and imaging method for a magnetic resonance imaging device, which can accurately control the magnet system. For superconducting magnets, by finely adjusting parameters such as the temperature and pressure of liquid helium, the superconducting state can be maintained to ensure the high stability of the main magnetic field. In terms of spatial positioning, the control system can accurately drive the gradient system, and the gradient amplifier accurately outputs current according to instructions, so that the gradient coil generates a highly linear gradient magnetic field in the three directions of x, y, and z.

[0042] 2. The present invention provides a control system and an imaging method for a magnetic resonance imaging device. The image reconstruction module in the control system adopts advanced mathematical algorithms, which can quickly and accurately convert the collected radio frequency signals into high-quality images. In addition, during the scanning process, the control system can process the image in real time and perform simple image enhancement operations, such as adjusting the window width and window position to make the image contrast more appropriate, so that the operator can observe the image quality in time during the scanning process and determine whether the scanning parameters need to be adjusted to achieve high-quality imaging, thereby improving the reliability and safety of MRI imaging.

[0043] 3. The present invention provides a control system and imaging method for a magnetic resonance imaging device, which plays a key role in the emission and reception of radio frequency pulses and can accurately set the frequency, intensity and duration of radio frequency pulses. When scanning muscle tissue and fat tissue, since their hydrogen proton precession frequencies are slightly different, the control system can adjust the radio frequency pulse parameters to achieve selective excitation, thereby obtaining images with good tissue contrast. The radio frequency receiver can also accurately receive and process weak radio frequency signals, effectively improving the signal-to-noise ratio and ensuring the quality of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the structure of the magnetic resonance imaging device control system of the present invention;

[0045] Figure 2 The present invention is a flowchart of the imaging method steps of the magnetic resonance imaging device of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the specific embodiments of the present invention to clearly and completely describe the technical solutions in the specific embodiments of the present invention. Obviously, the specific embodiments described are only part of the specific embodiments of the present invention, not all of the specific embodiments. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific implementation method:

[0048] like Figure 1-2 As shown, a specific embodiment of the present invention provides a control system for a magnetic resonance imaging device, including a hardware component device and a software control module, the hardware component device includes a scanning component and a magnetic resonance host, and the software control module includes a scanning parameter setting unit, a sequence control unit, an image reconstruction unit, and a system monitoring and feedback unit;

[0049] The scanning components specifically include gradient amplifiers and gradient coils, radio frequency transmitters and radio frequency receivers, and a magnet power supply and control unit for superconducting magnets;

[0050] The gradient amplifier receives the control signal from the host, converts it into a strong current, and drives the gradient coil to generate the required gradient magnetic field. The performance of the gradient amplifier directly affects the intensity, rise time and stability of the gradient magnetic field. In order to obtain high-resolution images, the gradient amplifier needs to be able to provide high-power, fast-switching current to generate steep gradient magnetic field changes;

[0051] Gradient coils are key components for generating gradient magnetic fields. They are usually composed of three groups of coils in the X, Y, and Z directions that are perpendicular to each other. They are placed inside the magnet. These coils, driven by the gradient amplifier, can generate a linearly changing magnetic field.

[0052] The RF transmitter is mainly composed of an RF power amplifier and an RF pulse generator. The RF pulse generator generates RF pulse signals with specific frequency, bandwidth and pulse shape according to the scanning sequence set by the host, and the RF power amplifier amplifies these signals to sufficient power to effectively excite hydrogen protons in human tissues.

[0053] The RF receiver is used to receive the weak RF signal emitted by human tissue after RF pulse excitation, including preamplifier, mixer, and filter components. The preamplifier first amplifies the weak signal, then converts the signal into an intermediate frequency signal through the mixer, and then passes through the filter to remove noise and interference signals, and finally transmits the processed signal to the host for subsequent processing;

[0054] The magnet power supply and control unit is mainly responsible for providing a stable power supply and precise temperature control for the superconducting magnet. It ensures that the superconducting coil inside the magnet is always in a superconducting state by controlling the cooling system of liquid helium.

[0055] The MRI host includes a bed drive motor and a controller;

[0056] The bed drive motor is the power source that controls the movement of the bed. It can accurately adjust the position of the bed so that different parts of the patient's body can accurately enter the scanning area.

[0057] The controller controls the speed, direction and stroke of the motor according to the instructions issued by the host.

[0058] The scanning parameter setting unit is an important interface for the operator to interact with the magnetic resonance imaging equipment control system. Through this module, the operator can set various scanning parameters, such as the scanning sequence type (spin echo, gradient echo, fast spin echo, etc.), scanning site (head, neck, chest, abdomen, etc.), scanning layer thickness (ranging from a few millimeters to tens of millimeters), field of view size (determines the size of the scanning range), and matrix size (affects the resolution of the image). For example, when scanning tiny brain lesions, the operator may choose a thinner scanning layer thickness and a smaller field of view, and use a high-resolution scanning sequence to improve the detection rate of lesions.

[0059] The sequence control unit is responsible for controlling the execution of the scanning sequence. It coordinates the work of the gradient system, the radio frequency system and the signal acquisition system according to the sequence type set in the scanning parameter setting module and the predetermined time sequence and parameters;

[0060] For example, in a spin echo sequence, the sequence control module first controls the gradient system to generate a slice selection gradient magnetic field to determine the slice to be scanned;

[0061] Then command the radio frequency system to emit 90° radio frequency pulses to excite the hydrogen protons in this layer;

[0062] Then, after waiting for a certain echo time TE, a 180° RF pulse is emitted to re-phase the hydrogen protons and generate a spin echo signal.

[0063] Finally, the signal acquisition system is controlled to collect the echo signal at the appropriate time.

[0064] The image reconstruction unit converts the collected RF signal into a visual image. It uses the Fourier transform mathematical algorithm to process the signal. The specific processing process is as follows:

[0065] First, the collected signal is preprocessed, including signal amplification, filtering, phase correction and other operations to improve the signal quality;

[0066] Then, based on the spatial information encoded by the gradient magnetic field, the signal is converted from the time domain to the frequency domain through Fourier transform, thereby reconstructing an image reflecting the anatomical structure of human tissue;

[0067] For example, when reconstructing brain images, the image reconstruction module can distinguish different tissue components such as gray matter, white matter, and cerebrospinal fluid based on the frequency distribution and phase information of the signal to generate a clear brain image.

[0068] The system monitoring and feedback unit is used to monitor the various subsystems of the entire MRI device in real time. It can monitor key parameters such as the current and temperature of the gradient amplifier, the power and frequency of the RF transmitter and receiver, the temperature of the magnet, and the magnetic field strength. When these parameters are out of the normal range, the system monitoring and feedback module will promptly issue an alarm and take corresponding measures, such as adjusting parameters and suspending scanning.

[0069] For example, if the temperature of the gradient amplifier is too high, it may affect its performance or even damage the equipment. The monitoring module will detect the abnormal temperature rise, automatically reduce the operating power of the gradient amplifier, and remind the operator to perform inspection and maintenance.

[0070] The control system also includes a signal acquisition module and a data processing module. The signal acquisition module includes an electromagnetic interference sensor, which is arranged on an examination bed matched with the magnetic resonance host and is used to collect surrounding electromagnetic interference signals. The data processing module analyzes the collected electromagnetic interference signals. When the intensity of the electromagnetic interference signal exceeds a preset threshold, the analysis results of the abnormal electromagnetic interference signal appearing around the magnetic resonance host are obtained.

[0071] The signal acquisition module also includes a magnetic field disturbance sensor, which is arranged on the magnetic resonance host and is used to collect magnetic field disturbance signals around the magnetic resonance host. The data processing module analyzes the collected magnetic field disturbance signals. When the intensity of the magnetic field disturbance signal exceeds a preset threshold, the analysis result of the abnormal magnetic field disturbance signal appearing around the magnetic resonance host is obtained.

[0072] The imaging method of the magnetic resonance imaging device comprises the following steps:

[0073] Step S1. First, remove metal objects on the patient, because metal will cause interference in the magnetic field, affect the image quality and may even cause harm to the patient;

[0074] Step S2. Then, the patient lies on the bed, and the operator moves the patient to a suitable position near the center of the magnet through the bed control system;

[0075] Step S3. The operator sets the scanning parameters on the main computer system. The selection of the scanning sequence depends on the scanning purpose and part. At the same time, the scanning layer thickness, layer spacing, field of view, matrix size and other parameters need to be set;

[0076] Step S4. The magnet system generates a stable main magnetic field, which causes the hydrogen protons in the human tissue to precess along the magnetic field direction. Then, the gradient control system generates a gradient magnetic field according to the set parameters for spatial positioning. Then, the radio frequency control system emits radio frequency pulses to excite the hydrogen protons at a specific level.

[0077] Step S5. After being excited by the radio frequency pulse, the hydrogen protons will relax and emit radio frequency signals during the relaxation process. The radio frequency receiver receives these signals and transmits them to the main computer system;

[0078] Step S6. The main computer system performs pre-processing operations such as amplification and filtering on the collected signals, and then reconstructs the image through a complex mathematical algorithm. During the image reconstruction process, the information encoded by the gradient magnetic field is used to convert the radio frequency signal into an image reflecting the anatomical structure and physiological state of human tissue;

[0079] Step S7. The reconstructed image is displayed on the monitor of the main computer system, and then the operator evaluates the image to check the image quality, whether there are artifacts, and whether the region of interest is fully displayed. If the image quality does not meet the requirements, it is necessary to adjust the scanning parameters and rescan;

[0080] Step S8. Qualified images are stored in the computer's storage device for subsequent diagnosis and research. The stored images can also be transmitted via the network to other medical devices, such as the PACS system - medical image storage and communication system, for remote diagnosis or consultation.

[0081] The control system of the magnetic resonance imaging device of the present invention can accurately control the magnet system. For superconducting magnets, the superconducting state can be maintained by finely adjusting parameters such as the temperature and pressure of liquid helium to ensure the high stability of the main magnetic field. In terms of spatial positioning, the control system can accurately drive the gradient system, and the gradient amplifier accurately outputs current according to instructions, so that the gradient coil generates a highly linear gradient magnetic field in the three directions of x, y, and z.

[0082] The image reconstruction module in the control system of the magnetic resonance imaging device of the present invention adopts advanced mathematical algorithms, which can quickly and accurately convert the collected radio frequency signals into high-quality images. In addition, during the scanning process, the control system can process the image in real time and perform simple image enhancement operations, such as adjusting the window width and window position to make the image contrast more appropriate, so that the operator can observe the image quality in time during the scanning process and judge whether the scanning parameters need to be adjusted to achieve high-quality imaging, thereby improving the reliability and safety of MRI imaging.

[0083] The control system of the magnetic resonance imaging device of the present invention plays a key role in the transmission and reception of radio frequency pulses, and can accurately set the frequency, intensity and duration of radio frequency pulses. When scanning muscle tissue and fat tissue, since their hydrogen proton precession frequencies are slightly different, the control system can adjust the radio frequency pulse parameters to achieve selective excitation, thereby obtaining images with good tissue contrast. The radio frequency receiver can also accurately receive and process weak radio frequency signals, effectively improving the signal-to-noise ratio and ensuring the quality of the image.

[0084] Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the specific embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control system for a magnetic resonance imaging device, comprising a hardware component device and a software control module, characterized in that: The hardware component equipment includes a scanning component and a magnetic resonance host, and the software control module includes a scanning parameter setting unit, a sequence control unit, an image reconstruction unit and a system monitoring and feedback unit; The scanning components specifically include a gradient amplifier and a gradient coil, a radio frequency transmitter and a radio frequency receiver, and a magnet power supply and a control unit for a superconducting magnet; The gradient amplifier receives the control signal from the host, converts it into a strong current, and drives the gradient coil to generate the required gradient magnetic field. The performance of the gradient amplifier directly affects the intensity, rise time and stability of the gradient magnetic field. In order to obtain high-resolution images, the gradient amplifier needs to be able to provide high-power, fast-switching current to generate steep gradient magnetic field changes; The gradient coil is a key component for generating a gradient magnetic field. It is usually composed of three groups of coils in the X, Y, and Z directions that are perpendicular to each other. They are placed inside the magnet. These coils can generate a linearly changing magnetic field when driven by a gradient amplifier. The radio frequency transmitter is mainly composed of a radio frequency power amplifier and a radio frequency pulse generator. The radio frequency pulse generator generates radio frequency pulse signals with specific frequency, bandwidth and pulse shape according to the scanning sequence set by the host, and the radio frequency power amplifier amplifies these signals to sufficient power to effectively excite hydrogen protons in human tissues; The radio frequency receiver is used to receive the weak radio frequency signal emitted by human tissue after radio frequency pulse excitation, and includes a preamplifier, a mixer, and a filter component. The preamplifier first preliminarily amplifies the weak signal, then converts the signal into an intermediate frequency signal through the mixer, and then passes through the filter to remove noise and interference signals, and finally transmits the processed signal to the host for subsequent processing; The magnet power supply and control unit is mainly responsible for providing a stable power supply and precise temperature control for the superconducting magnet. It ensures that the superconducting coil inside the magnet is always in a superconducting state by controlling the cooling system of liquid helium. The magnetic resonance host includes a bed drive motor and a controller; The bed drive motor is the power source for controlling the movement of the bed, and it can accurately adjust the position of the bed so that different parts of the patient's body can accurately enter the scanning area; The controller controls the speed, direction and travel of the motor according to the instructions issued by the host.

2. A control system for a magnetic resonance imaging device according to claim 1, characterized in that: The scanning parameter setting unit is an important interface for the operator to interact with the magnetic resonance imaging device control system. Through this module, the operator can set various scanning parameters, such as scanning sequence type, scanning location, scanning layer thickness, field of view size, and matrix size.

3. The control system of a magnetic resonance imaging device according to claim 1, characterized in that: The sequence control unit is responsible for controlling the execution of the scanning sequence. It coordinates the work of the gradient system, the radio frequency system and the signal acquisition system according to the sequence type set in the scanning parameter setting module and the predetermined time sequence and parameters.

4. The control system of a magnetic resonance imaging device according to claim 1, characterized in that: The image reconstruction unit converts the collected radio frequency signal into a visual image. It processes the signal using the Fourier transform mathematical algorithm. The specific processing process is as follows: First, the collected signal is preprocessed, including signal amplification, filtering, phase correction and other operations to improve the signal quality; Then, based on the spatial information encoded by the gradient magnetic field, the signal is converted from the time domain to the frequency domain through Fourier transform, thereby reconstructing an image reflecting the anatomical structure of human tissue.

5. The control system of a magnetic resonance imaging device according to claim 1, characterized in that: The system monitoring and feedback unit is used to monitor the various subsystems of the entire magnetic resonance imaging device in real time. It can monitor key parameters such as the current and temperature of the gradient amplifier, the power and frequency of the RF transmitter and receiver, the temperature of the magnet, and the magnetic field strength. When these parameters exceed the normal range, the system monitoring and feedback module will promptly issue an alarm and take corresponding measures, such as adjusting parameters and pausing scanning.

6. The control system of a magnetic resonance imaging device according to claim 1, characterized in that: The control system also includes a signal acquisition module and a data processing module. The signal acquisition module includes an electromagnetic interference sensor, which is arranged on an examination bed matched with the magnetic resonance host and is used to collect surrounding electromagnetic interference signals. The data processing module analyzes the collected electromagnetic interference signals, and when the intensity of the electromagnetic interference signal exceeds a preset threshold, obtains the analysis results of abnormal electromagnetic interference signals appearing around the magnetic resonance host.

7. The control system of a magnetic resonance imaging device according to claim 1, characterized in that: The signal acquisition module also includes a magnetic field disturbance sensor, which is arranged on the magnetic resonance host and is used to collect magnetic field disturbance signals around the magnetic resonance host. The data processing module analyzes the collected magnetic field disturbance signals and obtains analysis results of abnormal magnetic field disturbance signals appearing around the magnetic resonance host when the intensity of the magnetic field disturbance signal exceeds a preset threshold.

8. An imaging method of a magnetic resonance imaging device, characterized in that: The following steps are involved: Step S1. First, remove metal objects on the patient, because metal will cause interference in the magnetic field, affect the image quality and may even cause harm to the patient; Step S2. Then, the patient lies on the bed, and the operator moves the patient to a suitable position near the center of the magnet through the bed control system; Step S3. The operator sets the scanning parameters on the main computer system. The selection of the scanning sequence depends on the scanning purpose and part. At the same time, the scanning layer thickness, layer spacing, field of view, matrix size and other parameters need to be set; Step S4. The magnet system generates a stable main magnetic field, which causes the hydrogen protons in the human tissue to precess along the magnetic field direction. Then, the gradient control system generates a gradient magnetic field according to the set parameters for spatial positioning. Then, the radio frequency control system emits radio frequency pulses to excite the hydrogen protons at a specific level. Step S5. After being excited by the radio frequency pulse, the hydrogen protons will relax and emit radio frequency signals during the relaxation process. The radio frequency receiver receives these signals and transmits them to the main computer system; Step S6. The main computer system performs pre-processing operations such as amplification and filtering on the collected signals, and then reconstructs the image through a complex mathematical algorithm. During the image reconstruction process, the information encoded by the gradient magnetic field is used to convert the radio frequency signal into an image reflecting the anatomical structure and physiological state of human tissue; Step S7. The reconstructed image is displayed on the monitor of the main computer system, and then the operator evaluates the image to check the image quality, whether there are artifacts, and whether the region of interest is fully displayed; Step S8. Qualified images are stored in the computer's storage device for subsequent diagnosis and research.

9. The imaging method of a magnetic resonance imaging device according to claim 8, characterized in that: After the image is evaluated in step S7, if the image quality does not meet the requirements, it is necessary to adjust the scanning parameters and re-scan.

10. The imaging method of a magnetic resonance imaging device according to claim 8, characterized in that: After step S8, the stored images may also be transmitted to other medical devices via the network for remote diagnosis or consultation.

Images