Magnetic resonance system

Abstract

The application relates to a magnetic resonance system. The magnetic resonance system comprises an intelligent detection device, a magnetic resonance control unit and a scanning unit. The intelligent detection device performs physiological detection on a to-be-detected person and obtains a physiological characteristic parameter. The intelligent detection device is connected with the magnetic resonance control unit. The magnetic resonance control unit collects the physiological characteristic parameter, selects a scanning mode according to the physiological characteristic parameter, and determines scanning parameters according to the scanning mode. The scanning unit is connected with the magnetic resonance control unit. The magnetic resonance control unit controls the scanning unit to adjust a main magnetic field according to the scanning parameters, controls the scanning unit to scan the to-be-detected person with the main magnetic field according to the scanning parameters, and generates scanning data. The magnetic resonance control unit performs image reconstruction on the scanning data and obtains a scanning image. The individual differences of the to-be-detected person are considered. Different physiological characteristics of the to-be-detected person correspond to different scanning modes and scanning parameters. The main magnetic field is adjusted according to the scanning parameters, so that the imaging effect of the magnetic resonance system is improved.

Description

[0001] This application is a divisional application of the application number 2020101267566, filed on February 28, 2020, and entitled "Magnetic Resonance System and Control Method Thereof". TECHNICAL FIELD

[0002] The present application relates to the technical field of magnetic resonance, in particular to a magnetic resonance system. BACKGROUND

[0003] Magnetic resonance imaging is a medical imaging diagnostic technology that mainly uses the nuclear magnetic resonance phenomenon of certain atomic nuclei in human tissues, processes the obtained radio frequency signals by a computer, and reconstructs a certain layer of the human body. This imaging technology has multiple functions, multiple parameters, multi-planar imaging, and high soft tissue resolution, and is widely used in disease diagnosis.

[0004] According to the principle of MRI imaging, in addition to the constant stable main magnetic field, a gradient field and a corresponding radio frequency transmitting coil are also needed. The magnetic field and the radio frequency field satisfy the Larmor equation, so as to excite the atomic nuclei of the scanning tissue to produce resonance at a specific frequency, emit signals, and finally process the signals into images by a receiving coil of a specific frequency band.

[0005] In theory, the stronger the main magnetic field, the stronger the tissue magnetization, and the stronger the signal and high-contrast image. At ultra-high field strength, the chemical shift in the biological body increases, the blood oxygen level dependent (BOLD) contrast is enhanced, the relaxation time changes, and the magnetic susceptibility effect increases, which makes the application of ultra-high field magnetic resonance imaging technology in nuclear magnetic resonance spectroscopy, BOLD functional magnetic resonance imaging, chemical exchange saturation transfer (CEST), susceptibility weighted imaging (SWI), and quantitative susceptibility mapping (QSM) have inherent advantages. However, in practice, the relaxation process of tissue magnetization also changes significantly with the increase of the magnetic field, making it more difficult to process many high-field magnetic resonance signals, and the image contrast may be worse. How to improve the imaging effect of the magnetic resonance system is a problem to be solved. SUMMARY

[0006] Therefore, it is necessary to provide a magnetic resonance system and a control method thereof for solving the problem of how to improve the imaging effect of the magnetic resonance system.

[0007] A control method of a magnetic resonance system, comprising:

[0008] S100, selecting a scanning mode according to a physiological characteristic parameter of a subject to be detected.

[0009] S200, determining a scanning parameter according to the scanning mode.

[0010] S300, scanning the subject to be detected according to the scanning parameter to obtain scanning data.

[0011] S400, image reconstruction on the scanning data to obtain a scanning image.

[0012] In one embodiment, the physiological characteristic parameter includes one or more of age, height, weight, a scanning site, or a physiological index parameter.

[0013] In one embodiment, the scanning parameter includes a system scanning parameter and a sequence scanning parameter. The system scanning parameter includes one or more of a main magnetic field strength, a position of a scanning bed, an inter-magnet temperature of a magnetic resonance system, or an inter-magnet humidity of the magnetic resonance system. The sequence scanning parameter includes one or more of a radio frequency pulse parameter, a gradient field parameter, or a signal acquisition time. The radio frequency pulse parameter includes one or more of a bandwidth of a radio frequency pulse, an intensity of the radio frequency pulse, an application time of the radio frequency pulse, or a duration of the radio frequency pulse. The gradient field parameter includes one or more of an application direction of a gradient field, a field strength of the gradient field, an application time of the gradient field, or a duration of the gradient field.

[0014] In one embodiment, S100 includes:

[0015] S110, determining one or more of a specific absorption rate threshold value, a peripheral nerve stimulation threshold value, a scanning time threshold value, or a sound tolerance threshold value that the subject to be detected can bear according to the physiological parameter.

[0016] S120, determining the scanning mode according to one or more of the specific absorption rate threshold value, the peripheral nerve stimulation threshold value, the scanning time threshold value, or the sound tolerance threshold value.

[0017] In one embodiment, the scanning mode includes one or more of a low-field scanning mode, a mid-field scanning mode, a high-field scanning mode, or an ultra-high-field scanning mode.

[0018] In one embodiment, the scanning mode includes a plurality of scanning stages. The plurality of scanning stages uses one or more of a low-field scanning mode, a mid-field scanning mode, a high-field scanning mode, or an ultra-high-field scanning mode.

[0019] In one embodiment, before S100, further comprising:

[0020] S010, obtaining a plurality of physiological characteristic parameters, a plurality of scanning modes and a plurality of scanning parameters, and establishing a corresponding relationship between the plurality of physiological characteristic parameters and the plurality of scanning modes, and establishing a corresponding relationship between the plurality of scanning modes and the plurality of scanning parameters.

[0021] A magnetic resonance system includes an intelligent detection device, a magnetic resonance control unit and a scanning unit. The intelligent detection device is used for physiological detection on a to-be-detected person, and obtains a physiological characteristic parameter. The intelligent detection device is connected with the magnetic resonance control unit. The magnetic resonance control unit collects the physiological characteristic parameter. The intelligent detection device selects a scanning mode according to the physiological characteristic parameter. The magnetic resonance control unit determines a scanning parameter according to the scanning mode. The scanning unit is connected with the magnetic resonance control unit. The magnetic resonance control unit controls the scanning unit to scan the to-be-detected person according to the scanning parameter. The scanning unit generates scanning data. The magnetic resonance control unit performs image reconstruction on the scanning data to obtain a scanning image.

[0022] In one embodiment, the scanning unit includes a power module, a magnetic field adjusting unit, a magnet component, a gradient component and a radio frequency component.

[0023] The power module is connected with the magnetic resonance control unit. The magnetic resonance control unit controls the power module to generate a first driving current, a second driving current and a third driving current according to the scanning parameter.

[0024] The magnetic field adjusting unit is connected with the power module and the magnetic resonance control unit. The magnetic resonance control unit controls the magnetic field adjusting unit to adjust the first driving current to obtain a fourth driving current according to the scanning parameter.

[0025] The magnet component is connected with the magnetic field adjusting unit. The magnet component receives the fourth driving current and generates a main magnetic field.

[0026] The gradient component is connected with the power module. The gradient component receives the second driving current and generates a gradient magnetic field.

[0027] The radio frequency component is connected with the power module. The radio frequency component receives the third driving current and emits a radio frequency pulse. In one embodiment, the magnetic resonance control unit further includes a display control module.

[0028] The display control module is used for displaying a plurality of scanning modes and receiving an external instruction. In one embodiment, the physiological characteristic parameter includes one or several of an age, a scanning site or a physiological index parameter.

[0029] In one embodiment, the magnetic field adjusting unit comprises a field increasing unit and a field decreasing unit.

[0030] The power supply module, the magnet component and the magnetic resonance control unit are connected with the field increasing unit respectively. When it is needed to increase the intensity of the background magnetic field, the field increasing unit increases the first driving current according to the control signal to obtain the fourth driving current. The field increasing unit outputs the fourth driving current to the magnet component.

[0031] The field decreasing unit is connected with the field increasing unit in parallel. The power supply module, the magnet component and the magnetic resonance control unit are connected with the field decreasing unit respectively. When it is needed to decrease the intensity of the background magnetic field, the field increasing unit decreases the first driving current according to the control signal to obtain the fourth driving current. The field increasing unit outputs the fourth driving current to the magnet component.

[0032] In one embodiment, the magnetic resonance system further comprises a bed body. The bed body is connected with the magnetic resonance control unit. The magnetic resonance control unit controls the bed body to drag the to-be-detected person to move in the background magnetic field area.

[0033] The magnetic resonance system provided by the embodiment of the present application comprises selecting a scanning mode according to a physiological characteristic parameter of a to-be-detected person. A scanning parameter is determined according to the scanning mode. The to-be-detected person is scanned according to the scanning parameter to obtain scanning data. An image is reconstructed from the scanning data to obtain a scanning image. The magnetic resonance system considers individual differences of to-be-detected persons. To-be-detected persons with different physiological characteristics are scanned by different scanning modes. Different scanning modes correspond to different scanning parameter settings, so as to improve the final imaging effect of the magnetic resonance system. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A flowchart of a control method of the magnetic resonance system provided by one embodiment of the present application is provided.

[0035] Figure 2 A relationship diagram of parameters in the magnetic resonance system provided by one embodiment of the present application is provided.

[0036] Figure 3 A structural diagram of the magnetic resonance system provided by one embodiment of the present application is provided.

[0037] Figure 4 A structural diagram of the magnetic resonance system provided by one embodiment of the present application is provided.

[0038] REFERENCE NUMERALS:

[0039] Magnetic resonance system 10

[0040] Intelligent detection device 20

[0041] Magnetic Resonance Control Unit 30

[0042] Storage module 310

[0043] Data processing module 320

[0044] Signal transceiver module 330

[0045] Image processing module 340

[0046] Display control module 350

[0047] Scanning unit 40

[0048] Power module 410

[0049] Magnetic field adjustment unit 420

[0050] Lifting Unit 421

[0051] Falling Field Unit 422

[0052] Magnet component 430

[0053] Gradient component 440

[0054] RF component 450

[0055] Transmission Unit 451

[0056] Receiver unit 452

[0057] Bed 50 Detailed Implementation

[0058] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0059] The serial numbers assigned to components in this document, such as "first" and "second," are used solely to distinguish the objects being described and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0060] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] Please see Figure 1 and Figure 2 This application provides a control method for a magnetic resonance system, including:

[0062] S100 selects the scanning mode based on the physiological characteristics of the subject.

[0063] S200, determine the scanning parameters according to the scanning mode.

[0064] S300, the subject to be detected is scanned according to the scanning parameters to obtain scan data.

[0065] S400, perform image reconstruction on the scanned data to obtain a scanned image.

[0066] Theoretically, a higher main magnetic field strength can produce stronger tissue magnetization, resulting in stronger signals and higher contrast images. However, in reality, the relaxation process of tissue magnetization changes significantly with increasing magnetic field strength, making many high-field magnetic resonance signals more difficult to process, and the image contrast may actually be worse. Therefore, selecting different scanning modes based on the relaxation characteristics of different tissue magnetizations can improve the final imaging performance of the magnetic resonance system.

[0067] In one embodiment, the physiological characteristic parameters include one or more of age, height, weight, scanning site, or physiological indicators. These physiological characteristic parameters can be used to categorize individuals into sensitive and non-sensitive groups. Sensitive groups may include, for example, infants, the elderly, and critically ill patients.

[0068] In one embodiment, the scanning parameters include system scanning parameters and sequence scanning parameters. The system scanning parameters may be, for example, the main magnetic field strength, the position of the scanning bed, the temperature and humidity between the magnets in the magnetic resonance system, or the temperature of the gradient coil and the RF receiving coil in the current magnetic resonance system. The sequence scanning parameters may include RF pulse parameters, gradient field parameters, and signal acquisition time. The RF pulse parameters may be, for example, the bandwidth, intensity, application time, and duration of the RF pulse. The gradient field parameters may be, for example, the gradient field application direction, gradient field strength, application time, and duration.

[0069] In one embodiment, S100 includes:

[0070] S110, based on the physiological parameters, determine one or more of the specific absorption rate threshold, peripheral nerve stimulation threshold, scanning time threshold, or sound tolerance threshold that the subject can tolerate.

[0071] S120, the scanning mode is determined based on one or more of the specific absorption rate threshold, the peripheral nerve stimulation threshold, the scan time threshold, or the sound tolerance threshold.

[0072] Physiological parameters can be used to determine the subject's tolerable thresholds, including the Specific Absorption Ratio (SAR) threshold, Peripheral Nervous System (PNS) threshold, scan time threshold, and sound tolerance threshold, through a lookup table method. The SAR threshold is related to the radiofrequency energy absorbed by a unit mass of the subject per unit time and is proportional to the square of the main magnetic field strength. The PNS threshold measures the stimulation of nerve endings caused by rapid switching of the gradient field in the gradient coil. The sound tolerance threshold characterizes the decibel level of sound the subject can tolerate within the scanning cavity, and the source of sound decibels in the scanning cavity is mainly related to the switching of the gradient field. For example, noise generated during gradient field switching propagates through air and solids (such as the scanning gantry and scanning bed of the MRI system), eventually reaching the patient's ear; when a noise source generates noise, it also causes vibrations in the gantry components, producing sound that also enters the ear.

[0073] In one embodiment, the scanning mode includes one or more combinations of a low-field scanning mode, a mid-field scanning mode, a high-field scanning mode, or an ultra-high-field scanning mode. For example, the intensity of the main magnetic field corresponding to the low-field scanning mode is set to 0.5 T (Tesla) or less. The intensity of the main magnetic field corresponding to the mid-field scanning mode is set to any value between 0.5 T and 1.5 T. The intensity of the main magnetic field corresponding to the high-field scanning mode is set to any value between 3.0 T and 5.0 T. The intensity of the main magnetic field corresponding to the ultra-high-field scanning mode is set to greater than 5.0 T. For example, the intensity of the main magnetic field is set to 7.0 T, 9.4 T, or higher.

[0074] The scanning mode can also be divided into silent mode or standard mode based on the sound decibel level within the magnet compartment (where the magnetic resonance system is located). For example, in silent mode, the sound decibel level within the scanning compartment is below 60 decibels, such as 50-60 decibels. In standard mode, the sound decibel level within the scanning compartment is greater than 60 decibels. Correspondingly, a silent sequence is triggered in silent mode to change the gradient switching rate, ramp rate, etc.

[0075] In one embodiment, the subject of the examination is an infant. Infants are sensitive to noise. Typically, high-magnetic-field MRI systems are noisier than low-magnetic-field MRI systems, absorbing more radio frequency energy during the examination. Infants cannot undergo examinations using ultra-high magnetic-field MRI systems. Therefore, when examining infants, a non-ultra-high magnetic-field MRI system is selected to complete the examination. In this embodiment, a sound tolerance threshold can first be determined based on the physiological characteristics of the subject, and scanning parameters for low-field or medium-high-field scanning modes can be determined based on SAR thresholds and / or PNS thresholds.

[0076] In one embodiment, the scanning site is a nerve or blood vessel, or other area requiring high-resolution imaging, and the imaging results require high sensitivity and a high signal-to-noise ratio. In this case, a high-field or ultra-high-field scanning mode is selected. In this embodiment, the PNS threshold can be determined first based on the physiological characteristic parameters of the subject, and the gradient pulse parameters in the high-field or ultra-high-field scanning mode can be determined based on the PNS threshold.

[0077] In one embodiment, the subject is a non-sensitive individual, the scanning site is the head, and a high signal-to-noise ratio image is required to assess whether the subject has suffered a stroke. In this embodiment, the SAR threshold and / or PNS threshold can be determined first based on the subject's physiological characteristics. Based on the SAR and / or PNS thresholds, the scanning mode is determined as follows: a first stage performs a mid-to-low field scanning mode, with the scanning field of view within the first stage being the scanned area; a second stage performs a high-field or ultra-high-field scanning mode, with the scanning field of view within the second stage being the local region of interest (ROI) within the scanned area. In this embodiment, the scanned area is first globally imaged using a non-high-field scanning mode, and the ROI can be determined from the global imaging results. High-field or ultra-high-field scanning of the ROI improves the accuracy of the ROI scanning results, provided that the scanning does not exceed the SAR and / or PNS thresholds. Furthermore, high-field or ultra-high-field scanning of the ROI saves scanning time and facilitates rapid identification of fine lesions.

[0078] In one embodiment, the scanning mode includes one or more combinations of low-field scanning mode, mid-field scanning mode, high-field scanning mode, or ultra-high-field scanning mode.

[0079] In one embodiment, the scanning mode includes multiple scanning stages. The multiple scanning stages employ one or more of the following: low-field scanning mode, mid-field scanning mode, high-field scanning mode, or ultra-high-field scanning mode.

[0080] In one embodiment, the subject is a sensitive population, and the scanning site is the head to obtain local pathological changes in the brain. A scanning time threshold can be determined first based on the subject's physiological characteristics. Based on this threshold, a first main magnetic field strength (e.g., low-field or mid-field scanning mode) can be used to image one atomic nucleus in the first stage, and a second main magnetic field strength (e.g., high-field or ultra-high-field scanning mode) can be used to image a second atomic nucleus in the second stage. In this embodiment, a 1.5T main magnetic field is used to image hydrogen atoms in the first stage; a 7.0T main magnetic field is used to image sodium and oxygen atoms in the second stage. The reconstructed images of the two atoms are used to assess tissue viability or pathological changes in the region of interest. The control method of the magnetic resonance system provided in this application fully considers the individual differences of the subject; different scanning modes are suitable for subjects with different physiological characteristics. Different scanning modes correspond to different scanning parameter settings to improve the final imaging effect of the magnetic resonance system.

[0081] In one embodiment, prior to S100, the control method of the magnetic resonance system further includes:

[0082] S010, acquire multiple physiological feature parameters, multiple scanning modes and multiple scanning parameters, and establish a first correspondence between the multiple physiological feature parameters and the multiple scanning modes, and establish a second correspondence between the multiple scanning modes and the multiple scanning parameters.

[0083] In one embodiment, different age groups of the subject correspond to different scanning modes. Different scanning sites correspond to different scanning modes. Different physiological parameters correspond to different scanning modes.

[0084] Each of the scanning modes includes a main magnetic field strength and sequence scanning parameters. The magnetic field strength and sequence scanning parameters are different for different scanning modes.

[0085] In one embodiment, prior to S010, the control method of the magnetic resonance system further includes:

[0086] S020, the subject to be tested is tested to obtain the physiological characteristic parameters of the subject to be tested.

[0087] In one embodiment, S100 can be alternatively configured as follows: receiving an external control command and selecting the scanning mode according to the control command.

[0088] In one embodiment, after S010, the control method of the magnetic resonance system further includes evaluating the quality of the scanned image, generating a feedback factor, and adjusting the scanning parameters according to the feedback factor, wherein the scan can be re-performed based on the scanning parameters. Optionally, evaluating the quality of the scanned image may specifically include evaluating the contrast, signal-to-noise ratio, presence of artifacts, and whether it meets clinical requirements. Adjusting the scanning parameters according to the feedback factor may, for example, involve increasing the main magnetic field strength, increasing the gradient ramp rate, changing the sequence type, or adjusting the scanning area.

[0089] Please see also Figure 3 and Figure 4This application provides a magnetic resonance imaging (MRI) system 10, including an intelligent detection device 20, an MRI control unit 30, and a scanning unit 40. The intelligent detection device 20 performs physiological detection on the subject and obtains physiological characteristic parameters. The intelligent detection device 20 is connected to the MRI control unit 30. The MRI control unit 30 acquires the physiological characteristic parameters. The MRI control unit 30 selects a scanning mode based on the physiological characteristic parameters. The MRI control unit 30 determines scanning parameters based on the scanning mode. The scanning unit 40 is connected to the MRI control unit 30. The MRI control unit 30 controls the scanning unit 40 to scan the subject according to the scanning parameters. The scanning unit 40 generates scanning data. The MRI control unit 30 performs image reconstruction on the scanning data to obtain a scanned image.

[0090] The magnetic resonance system 10 provided in this embodiment performs physiological detection on the subject using the intelligent detection device 20 and obtains physiological characteristic parameters. The magnetic resonance control unit 30 selects a scanning mode based on the physiological characteristic parameters, determines scanning parameters based on the scanning mode, and controls the scanning unit 40 to scan the subject based on the scanning parameters. The magnetic resonance system 10 fully considers the individual differences of the subject; different scanning modes are suitable for subjects with different physiological characteristics. Different scanning modes correspond to different scanning parameter settings to improve the final imaging effect of the magnetic resonance system.

[0091] The magnetic resonance imaging system 10 provided in this application provides imaging through different scanning modes, i.e., scanning with different magnetic fields and frequencies. For magnetic resonance imaging scans of certain specific areas, the most suitable field strength mode can be selected based on the tissue relaxation characteristics to obtain optimal images. For certain populations, such as infants, scanning modes that are acceptable to their physical condition can be selected, such as a low-field, low-noise mode, to obtain images with an acceptable signal-to-noise ratio. For general scans, the most commonly used and economical low-field scanning mode can be selected, saving system costs and improving the scanning environment.

[0092] In one embodiment, the magnetic resonance control unit 30 evaluates the quality of the scanned image, generates a feedback factor, and adjusts the scanning parameters according to the feedback factor, allowing for a re-scan. Optionally, evaluating the quality of the scanned image may specifically involve assessing its contrast, signal-to-noise ratio, presence of artifacts, and whether it meets clinical requirements. The magnetic resonance control unit 30 feeds the feedback factor back to the scanning unit 40, and the scanning unit 40 adjusts the scanning parameters according to the feedback factor, for example, by increasing the main magnetic field strength, increasing the gradient ramp rate, changing the sequence type, or adjusting the scanning area.

[0093] In one embodiment, the intelligent detection device 20 includes, but is not limited to, a camera, a motion monitoring device, a physiological monitoring device, etc.

[0094] In one embodiment, the magnetic resonance control unit 30 includes a magnetic resonance spectrometer and a processor.

[0095] In one embodiment, the scanning unit 40 includes a power module 410, a magnetic field adjustment unit 420, a magnet component 430, a gradient component 440, and a radio frequency component 450.

[0096] The power supply module 410 may include a magnet power supply, a gradient power amplifier, and a radio frequency power amplifier. The magnet power supply of the power supply module 410 is connected to the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the magnet power supply of the power supply module 410 to generate a first drive current, controls the gradient power amplifier of the power supply module 410 to generate a second drive current, and controls the radio frequency power amplifier of the power supply module 410 to generate a third drive current according to the scanning parameters.

[0097] The magnetic field adjustment unit 420 is connected to the power supply module 410 and the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the magnet power supply of the magnetic field adjustment unit 420 to adjust the first driving current according to the scanning parameters, thereby obtaining a fourth driving current.

[0098] The magnet component 430 is connected to the magnetic field adjustment unit 420. The magnet component 430 receives the fourth driving current and generates the main magnetic field.

[0099] The gradient component 440 is connected to the gradient power amplifier of the power module 410. The gradient component 440 receives the second drive current and generates a gradient magnetic field for radio frequency excitation of layer selection.

[0100] The radio frequency (RF) component 450 includes an RF receiving coil and an RF transmitting coil. The RF transmitting coil of the RF component 450 is connected to the RF power amplifier of the power supply module 410. The RF transmitting coil of the RF component 450 receives the third driving current and generates an RF pulse, which is used to excite the nuclear spins in the subject's body. The RF receiving coil of the RF component 450 receives the magnetization signal generated by the nuclear spins in the subject's body to obtain the scan data. Of course, the scan data is a digital matrix obtained by analog-to-digital conversion of the magnetization signal and has been processed. The magnetic resonance control unit 30 is connected to the RF receiving coil of the RF component 450. The magnetic resonance control unit 30 performs a Fourier transform on the signal after analog-to-digital conversion, denoising, and gradient encoding to obtain the scan image.

[0101] The magnet component 430 can be a traditional immersion-type low-temperature superconducting magnet, a conduction-cooled high-temperature superconducting magnet, or other magnet components with controllable field strength. The strength of the main magnetic field generated by the magnet component 430 can be determined by changing the magnitude of the current flowing through it.

[0102] In one embodiment, the magnet component 430 is a superconducting magnet. The maximum magnetic field of a superconducting magnet is generally determined by the designed maximum operating current. However, in practice, the magnet can operate normally even below the maximum operating current. The current input to the magnet component 430 is adjusted by the magnetic field adjustment unit 420. The magnetic field adjustment unit 420 is an independent excitation power supply used to adjust the first driving current to obtain a fourth driving current. The superconducting magnet receives the fourth driving current and generates a main magnetic field, thereby realizing the operation of the raising and lowering field.

[0103] In one embodiment, the magnet component 430 is a superconducting magnet, whose coil is designed with a maximum current of I0, corresponding to a central field strength of B0. It can scan normally at any current below I0. The magnetic field adjustment unit 420 is electrically connected to the magnet component 430 and adjusts the scanning current of the magnet component 430 in real time, such as I0 / 2, I0 / 4, etc., thereby changing the magnetic field strength to B0 / 2, B0 / 4, etc., that is, the magnet has multiple levels of central field strength B0. i Generally, the magnetic field of the superconducting magnet is adjusted by the magnetic field adjustment unit 420, such as increasing from 1.5T to 3.0T in about 10 to 60 minutes, and decreasing from 3.0T to 1.5T in about 10 to 30 minutes.

[0104] In one embodiment, the magnetic field adjustment unit 420 includes an upfield unit 421 and an downfield unit 422.

[0105] The power module 410, the magnet component 430, and the magnetic resonance control unit 30 are respectively connected to the lift unit 421. When it is necessary to increase the intensity of the main magnetic field, the lift unit 421 increases the first driving current according to the control signal to obtain the fourth driving current. The lift unit 421 outputs the fourth driving current to the magnet component 430.

[0106] The field reduction unit 422 is connected in parallel with the field increase unit 421. The power supply module 410, the magnet component 430, and the magnetic resonance control unit 30 are respectively connected to the field reduction unit 422. When it is necessary to reduce the intensity of the main magnetic field, the field increase unit 421 reduces the first driving current according to the control signal to obtain the fourth driving current. The field increase unit 421 outputs the fourth driving current to the magnet component 430.

[0107] In one embodiment, the excitation power supply is disconnected after the field rise is complete. When a field fall is required, the excitation power supply is reconnected to the superconducting magnet, and the excitation power supply is operated to fall the field.

[0108] In one embodiment, the radio frequency component 450 includes a transmitting unit 451 and a receiving unit 452.

[0109] The transmitting unit 451 is connected to the power module 410. The transmitting unit 451 receives the third driving current and transmits radio frequency pulses. The receiving unit 452 receives the tissue magnetization signal to obtain the scan data. The magnetic field adjustment unit 420 is connected to the receiving unit 452. The magnetic field adjustment unit 420 collects the scan data and directly evaluates the scan data. The magnetic field adjustment unit 420 changes the current of the excitation power supply according to the evaluation result.

[0110] The transmitting unit 451 has at least two or more levels of bandwidth for transmitting radio frequency signals, such as a frequency band center frequency of fr0, fr1, or fr2. Correspondingly, the receiving unit 32 has a wide signal receiving function, or has at least two or more levels of frequency band signal receiving capability, such as a receiving frequency band center frequency of fb0, fb1, or fb2.

[0111] The multi-level central field strength of the aforementioned magnet needs to be matched with the multi-level radio frequency transmission frequency for system imaging, i.e., satisfying the Lamo equation:

[0112]

[0113] Where υ / 2π represents the gyrometry ratio, f ri To receive the center frequency of the frequency band, B i The field strength is in the central area.

[0114] In one embodiment, the transmitting unit 451 and the receiving unit 452 may be separate units, integrated units, or have partially overlapping functions.

[0115] In one embodiment, the magnetic field adjustment unit 420 and the power supply module 410 may be separate, integrated, or partially functionally overlapping, or even be a sub-component of the magnetic resonance control unit 30.

[0116] In one embodiment, the magnetic resonance control unit 30 includes a storage module 310, a data processing module 320, a signal transceiver module 330, and an image processing module 340.

[0117] The storage module 310 is used to store multiple physiological characteristic parameters, multiple scanning modes, and multiple scanning parameters. A first correspondence is formed between the multiple physiological characteristic parameters and the multiple scanning modes. A second correspondence is formed between the multiple scanning modes and the multiple scanning parameters. The scanning parameters include magnetic field strength, radio frequency component bandwidth, scanning sequence, and gradient parameters.

[0118] The intelligent detection device 20 and the storage module 310 are respectively connected to the data processing module 320. The data processing module 320 acquires the physiological characteristic parameters and selects the scanning mode according to the physiological characteristic parameters and the first correspondence. The data processing module 320 determines the scanning parameters according to the scanning mode and the second correspondence. The data processing module 320 obtains a first driving signal and an adjustment signal based on the magnetic field strength. The data processing module 320 obtains a second driving signal based on the gradient parameters and the scanning sequence. The data processing module 320 obtains a third driving signal based on the frequency band of the radio frequency component and the scanning sequence.

[0119] The power module 410, the magnetic field adjustment unit 420, and the radio frequency component 450 are respectively connected to the signal transceiver module 330. The signal transceiver module 330 outputs the first drive signal, the second drive signal, and the third drive signal to the power module 410. The power module 410 outputs the first drive current, the second drive current, and the third drive current. The signal transceiver module 330 outputs the adjustment signal to the magnetic field adjustment unit 420. The magnetic field adjustment unit 420 adjusts the first drive current according to the adjustment signal to obtain a fourth drive current. The signal transceiver module 330 receives the scan data.

[0120] The image processing module 340 is connected to the signal transceiver module 330. The image processing module 340 performs image reconstruction on the scanned data to obtain the scanned image. The image reconstruction process of the image processing module 340 is usually synchronized with the scanning process, that is, the image reconstruction is real-time.

[0121] In one embodiment, the magnetic resonance control unit 30 further includes a display control module 350. The display control module 350 is used to display multiple scanning modes and receive external commands. The display control module 350 is connected to the data processing module 320. The data processing module 320 selects the scanning mode according to the control commands.

[0122] In one embodiment, the display control module 350 further includes an interface for manually inputting the physiological characteristic parameters, the scanning mode, or manually selecting them.

[0123] In one embodiment, the display control module 350 includes, but is not limited to, a host software control interface, a hardware input control interface, and an emergency start / stop switch.

[0124] In one embodiment, the physiological characteristic parameters include one or more of age, scan site, or physiological index parameters.

[0125] In one embodiment, the magnetic resonance system 10 further includes a bed 50. The bed 50 is connected to the magnetic resonance control unit 30. The magnetic resonance control unit 30 controls the bed 50 to move the subject within the main magnetic field region.

[0126] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The embodiments described above merely illustrate several implementation methods of this application, and should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A magnetic resonance system, characterized in that, include: The intelligent detection device (20) is used to perform physiological detection on the subject and obtain physiological characteristic parameters; A magnetic resonance control unit (30) is connected to the intelligent detection device (20). The magnetic resonance control unit (30) is used to acquire the physiological characteristic parameters and select a scanning mode according to the physiological characteristic parameters. The magnetic resonance control unit (30) determines the scanning parameters according to the scanning mode. The scanning unit (40) is connected to the magnetic resonance control unit (30). The magnetic resonance control unit (30) controls the scanning unit (40) to scan the subject according to the scanning parameters. The scanning unit (40) generates scanning data. The magnetic resonance control unit (30) performs image reconstruction on the scanning data to obtain a scanned image. The scanning parameters include system scanning parameters and sequence scanning parameters; The system scanning parameters include the main magnetic field strength, and the system scanning parameters also include one or more of the following: the position of the scanning bed, the temperature between the magnets of the magnetic resonance system, and the humidity between the magnets of the magnetic resonance system. The sequence scanning parameters include one or more of the following: radio frequency pulse parameters, gradient field parameters, or signal acquisition time. The radio frequency pulse parameters include one or more of the following: radio frequency pulse bandwidth, radio frequency pulse intensity, radio frequency pulse application time, or radio frequency pulse duration. The gradient field parameters include one or more of the following: gradient field application direction, gradient field strength, gradient field application time, or gradient field duration.

2. The magnetic resonance system as described in claim 1, characterized in that, The magnetic resonance control unit (30) is used to evaluate the quality of the scanned image, generate a feedback factor, and adjust the scan parameters according to the feedback factor.

3. The magnetic resonance system as described in claim 1, characterized in that, The scanning unit (40) includes: A power supply module (410) is connected to the magnetic resonance control unit (30), which is used to control the power supply module (410) to generate a first driving current, a second driving current and a third driving current according to the scanning parameters. A magnetic field adjustment unit (420) is connected to the power supply module (410) and the magnetic resonance control unit (30). The magnetic resonance control unit (30) is used to control the magnetic field adjustment unit (420) to adjust the first driving current according to the scanning parameters to obtain a fourth driving current. A magnet component (430) is connected to the magnetic field adjustment unit (420), the magnet component (430) receives the fourth driving current and generates a main magnetic field; A gradient component (440), connected to the power module (410), receives the second driving current and generates a gradient magnetic field; and The radio frequency component (450) is connected to the power module (410) and is used to receive the third drive current and transmit radio frequency pulses.

4. The magnetic resonance system as described in claim 3, characterized in that, The magnetic field adjustment unit (420) includes: The lifting unit (421) is connected to the power module (410), the magnet component (430) and the magnetic resonance control unit (30). When it is necessary to increase the strength of the main magnetic field, the lifting unit (421) increases the first driving current according to the control signal to obtain the fourth driving current. The lifting unit (421) outputs the fourth driving current to the magnet component (430). The field reduction unit (422) is connected in parallel with the field increase unit (421). The power supply module (410), the magnet component (430), and the magnetic resonance control unit (30) are respectively connected to the field reduction unit (422). When it is necessary to reduce the intensity of the main magnetic field, the field increase unit (421) reduces the first driving current according to the control signal to obtain the fourth driving current. The field increase unit (421) outputs the fourth driving current to the magnet component (430).

5. The magnetic resonance system as described in claim 1, characterized in that, The magnetic resonance control unit (30) includes: The storage module (310) is used to store multiple physiological feature parameters, multiple scanning modes and multiple scanning parameters, wherein the multiple physiological feature parameters and the multiple scanning modes form a first correspondence relationship, and the multiple scanning modes and the multiple scanning parameters form a second correspondence relationship.

6. The magnetic resonance system as described in claim 5, characterized in that, The magnetic resonance control unit (30) also includes: The data processing module (320) is connected to the intelligent detection device (20) and the storage module (310). The data processing module (320) is used to collect the physiological feature parameters and determine the scanning mode according to the physiological feature parameters and the first correspondence. The data processing module (320) is used to determine the scanning parameters according to the scanning mode and the second correspondence.

7. The magnetic resonance system as described in claim 6, characterized in that, The magnetic resonance control unit (30) further includes a display control module (350), which is connected to the data processing module (320). The display control module (350) is used to display multiple scanning modes and receive external control commands. The data processing module (320) selects the scanning mode according to the external control commands.

8. The magnetic resonance system as described in claim 3, characterized in that, The power module (410) includes a magnet power supply, a gradient power amplifier, and an RF power amplifier, wherein: The magnetic resonance control unit (30) is used to control the magnet power supply to generate the first driving current according to the scanning parameters, control the gradient power amplifier to generate the second driving current, and control the radio frequency power amplifier to generate the third driving current.

9. The magnetic resonance system as described in claim 1, characterized in that, The scanning mode includes one or more combinations of low-field scanning mode, mid-field scanning mode, high-field scanning mode, or ultra-high-field scanning mode.

10. The magnetic resonance system as claimed in claim 1, characterized in that, The physiological characteristic parameters include one or more of the following: age, height, weight, scan site, or physiological index parameters.

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