Infant magnetic resonance imaging device

Abstract

The application provides a magnetic resonance imaging device for infants, which comprises a frame, an examination bed, a permanent magnet disc, a gradient coil unit, a radio frequency coil unit, an electromagnetic noise processing unit, an audio noise processing unit, a shielding cover and an electrical and electronic equipment. The permanent magnet disc is arranged in a U-shaped support to generate a static magnetic field; the gradient coil unit and the radio frequency coil unit are used to generate a gradient magnetic field and receive a magnetic resonance signal respectively. The electromagnetic noise processing unit and the audio noise processing unit are used for noise reduction, and the shielding cover is used for shielding external electromagnetic interference. The device is specially designed for the size and clinical needs of infants through small size design, low noise operation and high safety configuration, and provides a small size, high safety infant imaging magnetic resonance device specially used for infants. The device effectively protects the noise of the detection object (such as animals) who cannot bear too strong noise, such as infants, and provides fast, convenient, clear and safe magnetic resonance imaging services for infants.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of magnetic resonance equipment, and relates to an infant magnetic resonance imaging device. BACKGROUND

[0002] At present, magnetic resonance imaging is an important means for diagnosing human diseases. Through scanning, clear images of human tissues can be provided. Compared with other diagnostic means, the magnetic resonance imaging system has no ionizing radiation and high clarity, and can provide more accurate disease information for doctors. In addition, magnetic resonance imaging has high spatial resolution, can provide better image data, and has high tissue recognition, so it has high dependence in medical diagnosis. Hospitals in various places have or will be equipped with magnetic resonance imaging systems designed for adults.

[0003] In the prior art, a movable electromagnetic shielding-free magnetic resonance imaging device is disclosed in Chinese Patent No. CN114259221A. The device includes a static magnetic field composed of a permanent magnet; an electromagnetic noise detection and signal processing unit including a power electromagnetic noise acquisition sensor, a spatial electromagnetic noise acquisition sensor, a low-noise preamplifier, and a signal conditioning circuit; a radio frequency coil unit including a radio frequency excitation coil and a radio frequency receiving coil; a self-shielded gradient coil unit including an upper and lower two-plane coil including a three-way gradient coil; an electronic device unit including a signal front-end control box, a radio frequency power amplifier, a gradient power amplifier, and a spectrometer; an active field uniformization unit including a field uniformization current source and a field uniformization coil. The magnetic resonance imaging area includes a cavity for accommodating a human body and a radio frequency receiving coil; and a movable chassis on which each unit is arranged. The device realizes active noise reduction, can work normally in a shielding-free environment, has the characteristics of miniaturization and mobility, and can be used in ordinary wards.

[0004] However, in the obstetrics and gynecology departments of major hospitals, a considerable number of newborn babies are born every day. In the newly born babies, some newborn babies have birth injuries or congenital deficiencies in internal organs, and diseases such as hypoxic-ischemic encephalopathy caused by inhaling amniotic fluid during delivery pose a huge threat to their physiological and cognitive development. It is necessary to check the cause, make a diagnosis and treatment in the shortest time and shortest distance. Magnetic resonance imaging is the safest and clearest anatomical contrast clinical imaging method for infants. However, there is no device specially installed in the pediatric emergency room for scanning and imaging of infants at zero distance in existing hospitals, and there are also few small-aperture pediatric magnetic resonance imaging devices suitable for infants. The existing magnetic resonance imaging system for adults is large in size, high in noise, and difficult to maintain. At present, there is a lack of small-size, low-noise, and high-safety infant imaging magnetic resonance devices specially used for infants. SUMMARY

[0005] Therefore, the present application aims to provide an infant magnetic resonance imaging device, which is specially designed for the small size and high safety of infant imaging.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] An infant magnetic resonance imaging device comprises a rack, an examination bed, a permanent magnet disc, a gradient coil unit, a radio frequency coil unit, an electromagnetic noise processing unit and an audio noise processing unit, a shielding cover and electrical and electronic equipment.

[0008] The upper part of the rack is provided with a vertically arranged U-shaped support, the permanent magnet disc is arranged in the U-shaped support, and a horizontal static magnetic field is formed in the middle of the U-shaped support; the inner surface of the permanent magnet disc is provided with a gradient coil unit for generating a gradient magnetic field; the radio frequency coil unit comprises a radio frequency excitation coil and a radio frequency receiving coil, the radio frequency excitation coil is arranged on the inner surface of the permanent magnet disc, for exciting the sample to generate a magnetic resonance signal, and the magnetic field generated by the radio frequency excitation coil is orthogonal to the direction of the static magnetic field; the radio frequency receiving coil is arranged in the middle target area of the static magnetic field, for receiving the magnetic resonance signal; the electromagnetic noise processing unit and the audio noise processing unit are arranged on the U-shaped support, respectively for electromagnetic noise reduction and audio noise reduction; the inner side of the radio frequency coil unit is provided with a sliding rail; the examination bed is arranged at one end of the sliding rail and can be driven into or out of the radio frequency coil unit through the sliding rail; the middle part of the U-shaped support is provided with an openable and closable shielding cover, one end of the shielding cover is hinged to the rack, for shielding external electromagnetic interference; the electrical and electronic equipment is arranged in the electrical cabinet below the rack, and the electrical and electronic equipment comprises a signal front-end control box, a radio frequency power amplifier, a gradient power amplifier and a spectrometer.

[0009] Further, the electromagnetic noise processing unit comprises an electromagnetic noise acquisition sensor, a low-noise preamplifier and a signal conditioning circuit; the electromagnetic noise acquisition sensor is electrically connected with the low-noise preamplifier and the signal conditioning circuit; the electromagnetic noise acquisition sensor has a plurality of sensors, which are respectively arranged at the front end, the rear end and the middle of the inner wall of the bottom of the U-shaped support, for multi-directional detection of spatial electromagnetic noise; the signal conditioning circuit is a noise processing module, which is arranged on a circuit board; the electromagnetic noise signal received by the electromagnetic noise acquisition sensor is amplified by the low-noise preamplifier with low noise and high gain, and then processed by the low-pass and high-pass filters of the signal conditioning circuit, and then input into the spectrometer to filter out the electromagnetic noise signal from the magnetic resonance signal by using the least square, wavelet transform and Fourier transform algorithms, so as to improve the signal-to-noise ratio.

[0010] Further, the audio noise processing unit comprises a noise reduction processing circuit, a reverse amplification circuit, a loudspeaker and a microphone, the loudspeaker and the microphone are arranged at the front end, the rear end and the middle of the inner wall of the U-shaped support for multi-directional collection and output of audio; the microphone and the loudspeaker are connected with the noise reduction processing circuit, the microphone is used for collecting audio noise, and the noise reduction processing circuit processes the audio noise collected by the microphone into a reverse 180° phase sound wave and then outputs the sound wave through the loudspeaker to offset the noise heard by the human ear.

[0011] Further, soft rubber is arranged between the gradient coil and the permanent magnet disc and between the gradient coil unit and the rack to buffer the vibration of the gradient coil unit during operation and reduce the noise generated by the gradient coil unit during vibration.

[0012] Further, the electromagnetic noise collection sensor is a coil type sensor, a current transformer type sensor or a capacitor type sensor, is sleeved around the power supply line and is not directly connected with the power supply line, and is used for detecting power supply electromagnetic noise; the electromagnetic noise collection sensor comprises one or more electromagnetic noise collection coils, the electromagnetic noise collection coil is a single-turn or multi-turn solenoid type, a saddle type, a surface type or a coil packaged on a flexible PCB, the electromagnetic noise collection coil is parallel to the radio frequency receiving coil or is at a certain angle with the central axis of the radio frequency receiving coil, and the angle is adjusted according to the noise measurement result to select the angle direction of maximum noise detection.

[0013] Further, the gradient coil unit comprises two upper and lower planar coils, the two planar coils respectively comprise three gradient coils in X, Y and Z directions, each gradient coil is composed of two upper and lower spaced apart sub-planar coils, the currents of the two sub-planar coils are opposite, the amperes of the planar coil subjected to a static magnetic field when the planar coil is electrified are reduced, and then the vibration of the gradient coil is reduced, the noise is reduced, and the gradient eddy current generated by the gradient coil during operation is reduced.

[0014] Further, the radio frequency excitation coil is any one of a figure-8 coil, a planar or arc surface solenoid coil or a cylindrical solenoid coil, is used for exciting a sample to generate a magnetic resonance signal, and the generated magnetic field is orthogonal to a horizontal magnetic field.

[0015] Further, the radio frequency receiving coil is composed of a plurality of independent saddle-shaped coils and solenoid-shaped coils, and the magnetic field directions generated by the saddle-shaped coils and the solenoid-shaped coils are perpendicular to each other.

[0016] Further, one side of the rack is provided with a display screen and operation buttons, and the electrical and electronic equipment is designed in an integrated layout; one side of the rack is provided with a handle, the bottom of the rack is provided with universal wheels, and the baby magnetic resonance imaging device can be moved to any specified position through the operation buttons.

[0017] Further, the examination bed is of telescopic structure.

[0018] The present application has the advantages of:

[0019] 1. The present application provides a magnetic resonance imaging device specially for infants. Due to the small size of infants, the space requirement for the imaging equipment is relatively small. The device of the present application, by adopting a small size design, can better adapt to the body characteristics of infants, providing higher image accuracy and better imaging effect. Compared with existing adult magnetic resonance imaging equipment, the device is more suitable for infants, especially in neonatal emergency, its advantages are more significant.

[0020] 2. The traditional magnetic resonance imaging equipment will generate a lot of noise during operation, which may cause discomfort or even fright to infants, especially newborns. The present application effectively reduces the electromagnetic noise and audio noise through the electromagnetic noise processing unit and the audio noise processing unit. Especially the audio noise processing unit converts the noise into an opposite phase sound wave through the noise reduction processing circuit, thereby canceling the noise heard by the human ear, significantly reducing the noise interference of the device during operation on the infant, and improving the comfort of the infant during the imaging process.

[0021] 3. The present application sets a soft rubber layer between the gradient coil unit and the permanent magnet disc, which is used to buffer the vibration during work and reduce the noise and mechanical vibration generated by the gradient coil unit. This design can reduce the mechanical stress and vibration generated by the device during imaging, reduce the possible adverse effects on infants, and provide a safer imaging environment.

[0022] 4. The present application adopts an examination bed with telescopic structure, which can flexibly adjust the position according to the body size of the infant and the specific imaging needs. This design makes it more convenient for medical staff to perform examination operations, and at the same time can complete imaging in the shortest time, improving the efficiency of clinical operation. The electrical and electronic equipment is reasonably integrated and arranged, and operation buttons, display screens and universal wheels are arranged on the rack, so that the whole device has high portability. The device can be easily moved to different wards or emergency rooms to provide timely examination services for infants who need emergency imaging, greatly improving the use flexibility of the device and the work efficiency of the hospital.

[0023] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, and will be learned from the practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the drawings, in which:

[0025] Figure 1 It is a whole schematic diagram of the infant magnetic resonance imaging device in the present application.

[0026] Figure 2 It is a U-shaped support structure schematic diagram in the present application.

[0027] Figure 3 It is a radio frequency transmitting coil schematic diagram in the present application, in which (a) is an 8-shaped coil schematic diagram, (b) is a planar solenoid schematic diagram, and (c) is a cylindrical solenoid schematic diagram.

[0028] Figure 4 It is a radio frequency receiving coil unit schematic diagram in the present application.

[0029] Figure 5 It is a gradient coil unit structure schematic diagram in the present application, in which (a) is a gradient coil X, Y direction three-dimensional schematic diagram, and (b) is a gradient coil Z direction three-dimensional schematic diagram.

[0030] Figure 6 It is a whole machine working principle schematic diagram in the present application.

[0031] Figure 7 It is an audio noise reduction principle diagram in the present application.

[0032] Figure 8 It is an electromagnetic noise reduction principle diagram in the present application.

[0033] The reference signs: 1 - rack; 2 - U-shaped support; 3 - radio frequency receiving coil unit; 4 - examination bed; 5 - slide rail; 6 - shielding cover; 7 - microphone; 8 - loudspeaker; 9 - electrical and electronic equipment; 10 - display screen; 11 - handle; 12 - operation button; 13 - universal wheel; 14 - hinge; 15 - electromagnetic noise collection sensor; 21 - permanent magnet; 22 - radio frequency excitation coil; 23 - gradient coil unit. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below with reference to the specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure. The present application can also be implemented or applied by different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the diagrams provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the following examples and features in the examples can be combined with each other without conflict.

[0035] The drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the present application; in order to better illustrate the embodiments of the present application, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the positional relationship described in the drawings is only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0037] Please refer to Figures 1-8 It is a kind of baby magnetic resonance imaging device, including rack 1, examination bed 4, permanent magnet 21 disc, radio frequency receiving coil, electromagnetic noise processing unit and audio noise processing unit, shield 6 and electrical and electronic equipment 9;Rack 1 upper part is provided with the U-shaped support 2 of vertical arrangement, permanent magnet 21 is arranged on the two sides of U-shaped support 2;Gradient coil unit 23 is arranged on the inner surface of permanent magnet 21 disc, for generating gradient magnetic field;The outer side of gradient coil unit 23 is provided with radio frequency transmitting coil;Noise reduction processing device is arranged on U-shaped support 2.

[0038] Wherein, gradient coil unit 23 includes two upper and lower plane coils, the upper and lower plane coils contain three gradient coils in X, Y and Z directions respectively, each gradient coil is composed of two plane coils spaced a certain distance apart, the currents of the two coils are opposite, by reducing the ampere force of coil received by static magnetic field when current flows, further reduce the vibration of gradient coil, reduce noise, at the same time reduce the gradient eddy current generated by gradient coil in work.Gradient coil and magnet, gradient coil and rack 1 are provided with soft rubber, for buffering the vibration of gradient coil when working, reducing the noise generated by gradient coil when vibrating.

[0039] The radio frequency receiving coil is fixedly arranged at the middle part of the U-shaped support 2, and the axis of the radio frequency receiving coil is perpendicular to the horizontal magnetic field; the radio frequency receiving coil is provided with a sliding rail 5; the examination bed 4 is of a telescopic structure, arranged on the sliding rail 5, and driven to enter or exit the radio frequency receiving coil unit 3 through the sliding rail 5; the middle part of the U-shaped support 2 is provided with an openable shielding cover 6; one end of the shielding cover 6 is arranged on the rack 1 through a hinge 14. The radio frequency coil unit comprises a radio frequency excitation coil 22 and a radio frequency receiving coil; the radio frequency excitation coil 22 and the radio frequency receiving coil can be arranged separately, or the radio frequency excitation coil 22 and the radio frequency receiving coil can be an integrated coil; when the radio frequency excitation coil 22 and the radio frequency receiving coil are an integrated coil, the functions of exciting the sample to generate a magnetic resonance signal and receiving the magnetic resonance signal are simultaneously realized; when the radio frequency excitation coil 22 and the radio frequency receiving coil can be arranged separately, the radio frequency transmitting coil can be one of an 8-shaped coil, a planar (or arc surface) solenoid coil and a cylindrical solenoid coil, used for exciting the sample to generate a magnetic resonance signal, and the generated magnetic field is perpendicular to the direction of the main magnetic field. The radio frequency receiving coil unit 3 is formed by splicing a plurality of independent saddle-shaped coils and solenoid-shaped coils, and the magnetic field directions generated by the saddle-shaped coils and the solenoid-shaped coils are perpendicular to each other.

[0040] The shape and the number of turns of each coil unit in the radio frequency coil unit can be adjusted according to the actual application; each coil unit in the radio frequency coil is provided with a circuit unit matched therewith, and the circuit units in each coil unit are independent of each other, forming a multi-channel coil.

[0041] The electromagnetic noise processing unit comprises electromagnetic noise collection sensors 15, preamplifiers and signal conditioning circuits; the electromagnetic noise collection sensors 15 are distributed at the front end, the rear end and the middle of the inner wall of the bottom of the U-shaped support 2, used for multi-directional detection of space electromagnetic noise. The electromagnetic noise collection sensors 15 are coil-type sensors, current transformer-type sensors or capacitor-type sensors, which can be sleeved around the power supply line and are not directly connected to the power supply line, used for detecting human body coupled electromagnetic noise and power supply electromagnetic noise; the electromagnetic noise collection sensor 15 comprises one or more electromagnetic noise collection coils, which are single-turn or multi-turn solenoid-type, saddle-type, surface-type or coils packaged on a flexible PCB board, parallel to the radio frequency receiving coil or at a certain angle with the axis thereof, and the angle can be adjusted according to the noise measurement results to select the angle direction maximizing the noise detection.

[0042] The audio noise processing unit comprises a noise reduction processing circuit, a reverse amplification circuit, a loudspeaker 8 and a microphone 7; the loudspeaker 8 and the microphone 7 are arranged at the front end, the rear end and the middle of the inner wall of the U-shaped support 2, used for multi-directional collection and cancellation of audio noise.

[0043] In order to achieve the purpose of noise reduction, the application adopts two ways of audio noise reduction and electromagnetic noise reduction simultaneously, the electromagnetic noise reduction way is to increase the electromagnetic noise collection sensor 15, through detecting the space electromagnetic noise, extracting the characteristics of the electromagnetic noise, and then using the least square, wavelet transform, Fourier transform and other algorithms to filter the electromagnetic noise signal from the magnetic resonance signal, to improve the signal-to-noise ratio; the audio noise reduction is that the microphone 7 and the loudspeaker 8 are connected with the noise reduction processing circuit, the microphone 7 is used for collecting audio noise, and the noise reduction processing circuit processes the audio noise collected by the microphone 7 into a sound wave of reverse 180° phase and then outputs it through the loudspeaker 8, to offset the noise heard by the human ear.

[0044] In addition, in order to better achieve the noise reduction effect, the shielding cover 6 is increased, the shape of the shielding cover 6 matches the shape of the U-shaped support 2, and the inner space shielding external electromagnetic interference is formed after being closed.

[0045] The rack 1 is provided with a display screen 10 and an operation button 12 on one side, and the lower part of the rack 1 is provided with the electrical and electronic equipment 9 of the magnetic resonance imaging, including the signal front-end control box, the radio frequency power amplifier, the gradient power amplifier and the spectrometer, and the electrical and electronic equipment 9 is designed in an integrated layout. The rack 1 is also provided with a handle 11 on one side, which is unfolded when used and retracted when not used, and the bottom of the rack 1 is provided with a universal wheel 13, and the baby magnetic resonance imaging device can be moved to any specified position through the operation of the button 12.

[0046] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the application and are not limited, although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, and all should be covered in the scope of the claims of the application.

Claims

1. An infant magnetic resonance imaging device, characterized by: The machine frame, the examination bed, the permanent magnet disc, the gradient coil unit, the radio frequency coil unit, the electromagnetic noise processing unit and the audio noise processing unit, the shielding cover and the electrical and electronic equipment are included. The upper part of the machine frame is provided with a vertically arranged U-shaped support, and the permanent magnet disc is arranged in the U-shaped support and forms a horizontal static magnetic field in the middle of the U-shaped support; the inner surface of the permanent magnet disc is provided with a gradient coil unit for generating a gradient magnetic field; the radio frequency coil unit includes a radio frequency excitation coil and a radio frequency receiving coil, the radio frequency excitation coil is arranged on the inner surface of the permanent magnet disc, for exciting the sample to generate a magnetic resonance signal, and the magnetic field generated by the radio frequency excitation coil is perpendicular to the direction of the static magnetic field; the radio frequency receiving coil is arranged in the middle of the target area in the static magnetic field, for receiving the magnetic resonance signal; the electromagnetic noise processing unit and the audio noise processing unit are arranged on the U-shaped support, respectively for electromagnetic noise reduction and audio noise reduction; the inner side of the radio frequency coil unit is provided with a sliding rail; the examination bed is arranged at one end of the sliding rail and can be driven into or out of the radio frequency coil unit through the sliding rail; the middle part of the U-shaped support is provided with an openable shielding cover, one end of the shielding cover is hinged to the machine frame, for shielding external electromagnetic interference; the electrical cabinet below the machine frame is provided with electrical and electronic equipment, and the electrical and electronic equipment includes a signal front-end control box, a radio frequency power amplifier, a gradient power amplifier and a spectrometer.

2. The infant MRI device of claim 1, wherein: The electromagnetic noise processing unit includes an electromagnetic noise acquisition sensor, a low-noise preamplifier and a signal conditioning circuit; the electromagnetic noise acquisition sensor is electrically connected with the signal conditioning circuit through the low-noise preamplifier; the electromagnetic noise acquisition sensor has a plurality of sensors, which are respectively arranged at the front end, the rear end and the middle of the inner wall of the U-shaped support, for multi-directional detection of spatial electromagnetic noise; the signal conditioning circuit is a noise processing module arranged on a circuit board; the electromagnetic noise acquisition sensor receives the electromagnetic noise signal, amplifies the signal through the low-noise preamplifier, and then processes the signal through the low-pass and high-pass filtering of the signal conditioning circuit, and finally inputs the signal into the spectrometer to filter the electromagnetic noise signal from the magnetic resonance signal by using the least square, wavelet transform and Fourier transform algorithms, so as to improve the signal-to-noise ratio.

3. The infant MRI device of claim 1, wherein: The audio noise processing unit includes a noise reduction processing circuit, a reverse amplification circuit, a loudspeaker and a microphone, the loudspeaker and the microphone are arranged at the front end, the rear end and the middle of the inner wall of the U-shaped support, for multi-directional acquisition and output of audio; the microphone and the loudspeaker are connected with the noise reduction processing circuit, the microphone is used for collecting audio noise, and the noise reduction processing circuit processes the audio noise collected by the microphone into a sound wave with a reverse phase of 180° and then outputs the sound wave through the loudspeaker to offset the noise heard by the human ear.

4. The infant MRI device of claim 1, wherein: Soft rubber is arranged between the gradient coil and the permanent magnet disc and between the gradient coil unit and the machine frame, for buffering the vibration of the gradient coil unit during operation and reducing the noise generated by the gradient coil unit during vibration.

5. The infant MRI device of claim 2, wherein: The electromagnetic noise collection sensor is a coil type sensor, a current transformer type sensor or a capacitor type sensor, is sleeved around the power supply line and is not directly connected with the power supply line, and is used for detecting the power supply electromagnetic noise; the electromagnetic noise collection sensor comprises one or more electromagnetic noise collection coils, the electromagnetic noise collection coil is a single-turn or multi-turn solenoid type, a saddle type, a surface type or a coil packaged on a flexible PCB board, the electromagnetic noise collection coil is parallel to the radio frequency receiving coil or is at a certain angle with the central axis of the radio frequency receiving coil, and the angle is adjusted according to the noise measurement result to select the angle direction of the maximum noise detection.

6. The infant MRI device of claim 1, wherein: The gradient coil unit comprises two upper and lower planar coils, the two planar coils respectively comprise three gradient coils in X, Y and Z directions, each gradient coil is composed of two upper and lower spaced sub-planar coils, the currents of the two sub-planar coils are opposite, the ampere force of the planar coil under the static magnetic field when the current is reduced, and thus the vibration of the gradient coil is reduced, the noise is reduced, and the gradient eddy current generated by the gradient coil in operation is reduced.

7. The infant MRI device of claim 1, wherein: The radio frequency excitation coil is any one of a figure-8 coil, a planar or cambered solenoid coil or a cylindrical solenoid coil, is used for exciting the sample to generate a magnetic resonance signal, and the generated magnetic field is orthogonal to the horizontal magnetic field.

8. The infant MRI device of claim 1, wherein: The radio frequency receiving coil is formed by splicing a plurality of independent saddle-shaped coils and solenoid-shaped coils, and the magnetic field directions generated by the saddle-shaped coils and the solenoid-shaped coils are perpendicular to each other.

9. The infant MRI device of claim 1, wherein: One side of the rack is provided with a display screen and operation buttons, and the electrical and electronic equipment is designed in an integrated layout; one side of the rack is provided with a handle, and the bottom of the rack is provided with universal wheels, and the baby magnetic resonance imaging device can be moved to any specified position by operating the buttons.

10. The infant MRI device of claim 1, wherein: The examination bed is of a telescopic structure.

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