Magnetic resonance surface receiving coil based on inner ear imaging

Abstract

The invention discloses a magnetic resonance surface receiving coil based on inner ear imaging, and relates to the field of inner ear imaging, the coil comprises an outer layer surface receiving coil module, an inner layer surface receiving coil module and a capacitance / inductance decoupling total network; each of the outer-layer surface receiving coil module and the inner-layer surface receiving coil module comprises one or more layers of surface receiving coil groups; each outer layer surface receiving coil group comprises a plurality of outer layer surface receiving coils; the plurality of outer-layer surface receiving coils are annularly distributed around the head of the target object; each layer of inner-layer surface receiving coil group comprises a plurality of inner-layer surface receiving coils; the inner-layer surface receiving coil is arranged in an ear target area of a target object; the outer-layer surface receiving coil is larger than the inner-layer surface receiving coil in size; and the inner-layer surface receiving coil is connected with the outer-layer surface receiving coil in a set range through the capacitance / inductance decoupling total network. According to the invention, the problem of weak signals caused by small voxels in inner ear imaging in magnetic resonance can be solved.

Description

Technical Field

[0001] This application relates to the field of inner ear imaging, and particularly to a magnetic resonance surface receiving coil based on inner ear imaging. Background Art

[0002] Magnetic Resonance Imaging (MRI) is a non-invasive medical imaging technique. It uses a strong magnetic field to align the hydrogen protons inside the human body, and sends radio frequency pulses of a specific frequency through a transmitting coil to excite these hydrogen protons. When the hydrogen protons return to their initial state, they emit radio frequency signals, which are captured by a receiving coil and processed by a computer to be converted into images. Because the hydrogen proton density and relaxation time of different tissues in the human body are different, MRI can generate images with high contrast and effectively distinguish various tissue types. Compared with X-ray examinations and CT scans, the advantages of MRI lie in higher safety, support for three-dimensional imaging and multi-sequence imaging, especially prominent in the imaging of soft tissues.

[0003] Radio Frequency Coils (RF Coils) play a crucial role in magnetic resonance imaging systems. They work at the Larmor Frequency, are responsible for transmitting radio frequency pulses to excite hydrogen protons, and receive the signals released by these excited hydrogen protons, thereby generating electrical signals available for imaging. Radio Frequency Coils (RF Coils) can be mainly divided into volume coils and surface coils. Among them, surface coils are often used as receiving coils due to their high signal-to-noise ratio characteristics and are specially designed for the special needs of imaging different human body parts.

[0004] Inner Ear Magnetic Resonance Imaging (Inner Ear MRI) has an important position in modern medical imaging. It can clearly show the fine anatomical structures of the inner ear, such as the cochlea, vestibule, and semicircular canals, etc., and provides an important auxiliary role in the prevention, diagnosis, treatment, and evaluation of complex inner ear diseases. However, inner ear imaging is a challenging field in magnetic resonance imaging because the inner ear structure is very small and complex and is deeply buried inside the temporal bone, resulting in weak signals. Therefore, a magnetic resonance coil that can be applied to inner ear imaging is needed. Summary of the Invention

[0005] The purpose of this application is to provide a magnetic resonance surface receiving coil based on inner ear imaging, which can solve the problem of weak signals caused by small voxels in inner ear imaging of magnetic resonance.

[0006] To achieve the above purpose, this application provides the following solutions:

[0007] The present application provides a magnetic resonance surface receiving coil based on inner ear imaging, comprising: an outer layer surface receiving coil module, an inner layer surface receiving coil module, and a capacitance / inductance decoupling total network;

[0008] The outer layer surface receiving coil module includes one or more layers of outer layer surface receiving coil groups; each layer of the outer layer surface receiving coil group includes a plurality of outer layer surface receiving coils; the plurality of outer layer surface receiving coils are distributed in a ring around the head of the target object;

[0009] The inner layer surface receiving coil module is disposed between the outer layer surface receiving coil module and the head of the target object; the inner layer surface receiving coil module includes one or more layers of inner layer surface receiving coil groups; each layer of the inner layer surface receiving coil group includes a plurality of inner layer surface receiving coils; the inner layer surface receiving coils are disposed in the target ear region of the target object;

[0010] The size of the outer layer surface receiving coil is larger than the size of the inner layer surface receiving coil; the inner layer surface receiving coil is connected to the outer layer surface receiving coil within a set range through the capacitance / inductance decoupling total network.

[0011] Optionally, the outer layer surface receiving coil is rectangular; the inner layer surface receiving coil is square.

[0012] Optionally, the outer layer surface receiving coils are arranged at intervals; the inner layer surface receiving coils are arranged at intervals.

[0013] Optionally, the outer layer surface receiving coil includes a first outer layer coil side, a second outer layer coil side, a third outer layer coil side, a fourth outer layer coil side, a plurality of outer layer capacitors, and an outer layer port;

[0014] The first outer layer coil side and the second outer layer coil side are connected by one of the outer layer capacitors; the second outer layer coil side and the third outer layer coil side are connected by one of the outer layer capacitors; the third outer layer coil side and the fourth outer layer coil side are connected by one of the outer layer capacitors; the fourth outer layer coil side and the first outer layer coil side are connected by an outer layer port; one or more outer layer capacitors are disposed on the first outer layer coil side, the second outer layer coil side, and the third outer layer coil side;

[0015] The inner layer surface receiving coil includes a first inner layer coil side, a second inner layer coil side, a third inner layer coil side, a fourth inner layer coil side, a plurality of inner layer capacitors, and an inner layer port;

[0016] The first inner coil side and the second inner coil side are connected by one of the inner capacitors; the second inner coil side and the third inner coil side are connected by one of the inner capacitors; the third inner coil side and the fourth inner coil side are connected by one of the inner capacitors; the fourth inner coil side and the first inner coil side are connected by one of the inner ports; one or more inner capacitors are provided on the first inner coil side, the second inner coil side, and the third inner coil side.

[0017] Optionally, the outer surface receiving coil includes a first outer coil side, a second outer coil side, a third outer coil side, and a fourth outer coil side connected in sequence; the fourth outer coil side is further connected to the first outer coil side; the outer surface receiving coil further includes a plurality of outer capacitors and an outer port;

[0018] An outer capacitor is provided at the center of each of the first outer coil side, the second outer coil side, and the third outer coil side; an outer port is provided at the center of the fourth outer coil side; one or more outer capacitors are provided on the first outer coil side, the second outer coil side, and the third outer coil side;

[0019] The inner surface receiving coil includes a first inner coil side, a second inner coil side, a third inner coil side, and a fourth inner coil side connected in sequence; the fourth inner coil side is further connected to the first inner coil side; the inner surface receiving coil further includes a plurality of inner capacitors and an inner port;

[0020] An inner capacitor is provided at the center of each of the first inner coil side, the second inner coil side, and the third inner coil side; an inner port is provided at the center of the fourth inner coil side; one or more inner capacitors are provided on the first inner coil side, the second inner coil side, and the third inner coil side.

[0021] Optionally, one or more outer capacitors are provided on the fourth outer coil side; one or more inner capacitors are provided on the fourth inner coil side.

[0022] Optionally, the materials of the outer surface receiving coil and the inner surface receiving coil are both conductor materials.

[0023] Optionally, the materials of the outer surface receiving coil and the inner surface receiving coil are both annealed copper.

[0024] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0025] The present application provides a magnetic resonance surface receiving coil based on inner ear imaging. A multi-layer surface receiving coil group is arranged in the outer surface receiving coil module and the inner surface receiving coil module. Signals from different positions of the target area of the target object are simultaneously received by a plurality of outer surface receiving coils and inner surface receiving coils. With the increase of the surface receiving coils, the signal receiving sensitivity increases, thus solving the problem of weak signals of small voxels. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Isometric view of the magnetic resonance surface receiving coil based on inner ear imaging provided in an embodiment of the present application;

[0028] Figure 2 Front view of the magnetic resonance surface receiving coil based on inner ear imaging provided in an embodiment of the present application;

[0029] Figure 3 Top view of the magnetic resonance surface receiving coil based on inner ear imaging provided in an embodiment of the present application;

[0030] Figure 4 Left view of the magnetic resonance surface receiving coil based on inner ear imaging provided in an embodiment of the present application;

[0031] Figure 5 Schematic diagram of the inner surface receiving coil provided in an embodiment of the present application;

[0032] Figure 6 Isometric view of the simulated traditional magnetic resonance surface receiving coil group provided in an embodiment of the present application;

[0033] Figure 7 Front view of the simulated traditional magnetic resonance surface receiving coil group provided in an embodiment of the present application;

[0034] Figure 8 Front view of the simulated traditional magnetic resonance surface receiving coil group provided in an embodiment of the present application;

[0035] Figure 9 Left view of the simulated traditional magnetic resonance surface receiving coil group provided in an embodiment of the present application;

[0036] Figure 10 Relationship diagram of the radio frequency field intensity and frequency when using the simulated traditional surface receiving coil group provided in an embodiment of the present application;

[0037] Figure 11 This is the RF field distribution diagram when using a simulated traditional surface receiving coil group provided by an embodiment of the present application;

[0038] Figure 12 This is the relationship diagram of RF field intensity and frequency when using a magnetic resonance surface receiving coil based on inner ear imaging provided by an embodiment of the present application;

[0039] Figure 13 This is the RF field distribution diagram when using a magnetic resonance surface receiving coil based on inner ear imaging provided by an embodiment of the present application;

[0040] Reference numerals: outer surface receiving coil - 1, inner surface receiving coil - 2, inner layer port - 21, inner layer capacitor - 22. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0042] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0043] To clearly display the tiny structures of the inner ear, high spatial resolution is required, which usually means reduced voxel size and weakened signals, posing high requirements for the sensitivity of the receiving coil. At the same time, to receive signals from inside the temporal bone, a large induction depth is needed, while the RF field induction depth of traditional surface receiving coils cannot reach inside the temporal bone and it is difficult to meet the inner ear imaging requirements. Moreover, to maintain a high signal-to-noise ratio in the reconstructed images of the inner ear, complex imaging techniques such as parallel imaging need to be used, but the structure and mutual coupling of traditional surface receiving coils limit their ability to achieve parallel imaging. Therefore, the present application provides a magnetic resonance surface receiving coil group with high sensitivity, whose RF field induction depth meets the inner ear imaging requirements and can also suppress the coupling between coils for parallel imaging with a high signal-to-noise ratio.

[0044] As Figures 1 - 5 shown, a magnetic resonance surface receiving coil based on inner ear imaging provided by the present application includes: an outer surface receiving coil module, an inner surface receiving coil module, and a capacitance / inductance decoupling total network.

[0045] The outer surface receiving coil module includes one or more layers of outer surface receiving coil groups; each layer of the outer surface receiving coil group includes a plurality of outer surface receiving coils 1; the plurality of outer surface receiving coils 1 are annularly distributed around the head of the target object.

[0046] The inner surface receiving coil module is disposed between the outer surface receiving coil module and the head of the target object; the inner surface receiving coil module includes one or more layers of inner surface receiving coil groups; each layer of the inner surface receiving coil group includes a plurality of inner surface receiving coils 2; the inner surface receiving coils 2 are disposed in the target area of the ear of the target object.

[0047] The size of the outer surface receiving coil 1 is larger than the size of the inner surface receiving coil 2; the inner surface receiving coil 2 is connected to the outer surface receiving coil 1 within a set range through the capacitance / inductance decoupling total network.

[0048] By arranging multiple layers of surface receiving coils inside and outside, the problem of weak signals caused by small voxels in inner ear imaging of magnetic resonance is solved. The characteristics of this application lie in the multi-layer distribution of the surface receiving coils, the relative sizes of the inner and outer surface receiving coils, the decoupling method between the inner and outer surface receiving coils, and the parallel reception of radio frequency signals by the surface receiving coil groups; the surface receiving coils are multi-layer distributed, the multiple surface receiving coils located on the outer layer are annularly distributed around the head, and the multiple surface receiving coils located on the inner layer are closely attached to the ear; the outer surface receiving coil 1 has a large size that can achieve a larger radio frequency induction depth, and each inner surface receiving coil 2 has a size roughly the same as the inner ear in the target area; the inner and outer surface receiving coils are connected through a capacitance / inductance decoupling lumped network; multiple inner and outer surface receiving coils simultaneously receive signals from different positions in the inner ear of the target area.

[0049] In practice, the capacitance / inductance decoupling lumped network is a generalization of multiple capacitors, inductors, and complex circuits.

[0050] In an exemplary embodiment of this application, the outer surface receiving coil 1 is rectangular; the inner surface receiving coil 2 is square.

[0051] In an exemplary embodiment of the present application, the outer surface receiving coil 1 includes a first outer coil side, a second outer coil side, a third outer coil side, a fourth outer coil side, a plurality of outer capacitors, and an outer port; the first outer coil side and the second outer coil side are connected by one of the outer capacitors; the second outer coil side and the third outer coil side are connected by one of the outer capacitors; the third outer coil side and the fourth outer coil side are connected by one of the outer capacitors; the fourth outer coil side and the first outer coil side are connected by an outer port; one or more outer capacitors are provided on each of the first outer coil side, the second outer coil side, and the third outer coil side. In practical applications, zero, one, or more outer capacitors are provided on the fourth outer coil side.

[0052] The inner surface receiving coil 2 includes a first inner coil side, a second inner coil side, a third inner coil side, a fourth inner coil side, a plurality of inner capacitors 22, and an inner port 21; the first inner coil side and the second inner coil side are connected by one of the inner capacitors 22; the second inner coil side and the third inner coil side are connected by one of the inner capacitors 22; the third inner coil side and the fourth inner coil side are connected by one of the inner capacitors 22; the fourth inner coil side and the first inner coil side are connected by an inner port 21; one or more inner capacitors 22 are provided on each of the first inner coil side, the second inner coil side, and the third inner coil side. In practical applications, zero, one, or more inner capacitors 22 are provided on the fourth inner coil side.

[0053] The present application also provides another exemplary embodiment, in which the outer surface receiving coil 1 includes a first outer coil side, a second outer coil side, a third outer coil side, and a fourth outer coil side connected in sequence; the fourth outer coil side is further connected to the first outer coil side; the outer surface receiving coil 1 further includes a plurality of outer capacitors and an outer port.

[0054] An outer capacitor is provided at the center of each of the first outer coil side, the second outer coil side, and the third outer coil side; an outer port is provided at the center of the fourth outer coil side; one or more outer capacitors are provided on the first outer coil side, the second outer coil side, and the third outer coil side.

[0055] The inner surface receiving coil 2 includes a first inner coil side, a second inner coil side, a third inner coil side, and a fourth inner coil side connected in sequence; the fourth inner coil side is further connected to the first inner coil side; the inner surface receiving coil 2 further includes a plurality of inner capacitors 22 and an inner port 21.

[0056] An inner capacitor 22 is provided at the center of each of the first inner coil side, the second inner coil side, and the third inner coil side; an inner port 21 is provided at the center of the fourth inner coil side; one or more inner capacitors 22 are provided on the first inner coil side, the second inner coil side, and the third inner coil side.

[0057] In the practical applications of the above two embodiments, one or more outer capacitors are provided on the fourth outer coil side; one or more inner capacitors 22 are provided on the fourth inner coil side.

[0058] In practical applications, taking a simple double-layer flat rectangular surface receiving coil group with four-corner openings as an example, the magnetic resonance surface receiving coil group provided by the present application is specifically described as follows:

[0059] The magnetic resonance surface receiving coil group is composed of two layers of surface receiving coils, and the inner and outer layers are different surface receiving coils; the outer surface receiving coil 1 is rectangular, and each side of the rectangle is connected through a capacitor or a port at the four corners, one of the corners is a port, and three corners are capacitors, and the capacitance values of the capacitors are equal; the inner surface receiving coil 2 is square, and each side of the square is connected through a capacitor or a port at the four corners, one of the corners is a port, and three corners are capacitors, and the capacitance values of the capacitors are equal; in practical applications, the two ends of the capacitor can be connected to the side of the surface receiving coil by soldering. The connection method of the outer surface receiving coil 1 is the same as that of the inner surface receiving coil 2. A plurality of outer surface receiving coils 1 are distributed around the head portion, and there is no overlap between the coils; a plurality of inner surface receiving coils are closely distributed around the ear portion, and there is no overlap between the coils; the material of each side of the surface receiving coil is annealed copper. The ports and capacitors of the flat rectangular surface receiving coil can be located at the openings in the sides; there can be zero, one, or more capacitors in each side of the flat rectangular surface receiving coil. The number of the inner and outer surface receiving coils is theoretically not limited. In the actual design, the number of the inner and outer surface receiving coils should consider factors such as the complexity of decoupling, the convenience of practical applications, and the feasibility of manufacturing. The present application enhances the radio frequency field strength at a specific position through multiple layers of coils. When setting the number of the inner and outer surface receiving coils, two aspects of balance are mainly considered. One is whether it is beneficial to enhance the radio frequency field strength at a specific position, and the other is whether it will cause obstacles in aspects such as decoupling, practical applications, and manufacturing.

[0060] The geometric parameters and capacitance values of the inner and outer surface receiving coils are usually different. Adjust the geometric parameters and capacitance values of the inner and outer surface receiving coils so that the coil group operates at the Larmor frequency and the radio frequency field induction depth reaches the inner ear imaging depth; adjust the port directions of each surface receiving coil so that the current directions on the adjacent sides of adjacent coils are opposite. Connect the inner surface receiving coil 2 and its nearest outer surface receiving coil 1 through a capacitor with a relatively small capacitance value, and do not connect the other capacitors between the inner surface receiving coil 2 and the outer surface receiving coil 1. This simple capacitive / inductive decoupling lumped network can suppress the coupling between the inner and outer surface receiving coils.

[0061] In practical applications, the shapes of the outer surface receiving coil 1 and the inner surface receiving coil 2 can also be different. The surface receiving coil can be of any shape. However, considering that the shapes of existing surface receiving coils are usually rectangular or circular, the circular surface receiving coil does not have any special effects on performance and only has slight differences from the rectangular surface receiving coil in the decoupling part.

[0062] In an exemplary embodiment of the present application, the outer surface receiving coil 1 is arranged at intervals; the inner surface receiving coil 2 is arranged at intervals. Alternatively, in practical applications, the outer surface receiving coil 1 can overlap, and the inner surface receiving coil 2 can also overlap. Here, overlapping actually means that the coils are almost in contact with each other and a part of the area overlaps.

[0063] In an exemplary embodiment of the present application, the materials of both the outer surface receiving coil 1 and the inner surface receiving coil 2 are conductor materials. In an exemplary embodiment of the present application, the materials of both the outer surface receiving coil 1 and the inner surface receiving coil 2 are annealed copper.

[0064] In practical applications, the surface receiving coil group can be three-layer or more; the shape of the surface receiving coil can be circular or the shape of other common surface coils; the capacitance values of each capacitor on the surface receiving coil can be different; there can be overlap between the outer surface receiving coils; there can also be overlap between the inner surface receiving coils; the material of the surface receiving coil can be other conductors; the port directions of each surface receiving coil can be in any direction; a more complex and complete capacitive / inductive decoupling lumped network can be used to suppress the coupling between the inner and outer surface receiving coils. Subsequently, based on the surface receiving coil group in this embodiment, an optimized design can be carried out to achieve better inner ear imaging performance and realize higher-quality inner ear imaging.

[0065] The magnetic resonance surface receiving coil based on inner ear imaging provided by this application is a multi-layer interconnected composite parallel magnetic resonance surface coil group, which is applied as a receiving coil in inner ear magnetic resonance imaging at 1.5T. The surface receiving coil located on the outside has a larger size and can still receive radio frequency signals even when it is far from the target area of the inner ear. A plurality of outer surface receiving coils 1 are distributed annularly around the head to receive signals from different directions of the target area of the inner ear at multiple angles. The single surface receiving coil located on the inside has approximately the same size as the target area of the inner ear, is close to the ear in position, and has a high receiving sensitivity. The inner and outer surface receiving coils are connected through a capacitive / inductive decoupling lumped network to suppress the electromagnetic coupling between the inner and outer coils. A plurality of inner and outer surface receiving coils simultaneously receive signals from different positions in the target area of the inner ear to solve the problem of weak signals in small voxels. This application improves the deficiency that the radio frequency field induction depth of the traditional surface receiving coil cannot meet the requirements of inner ear imaging, and provides the possibility to display more anatomical details of the inner ear in magnetic resonance imaging.

[0066] This application is modeled and simulated in professional electromagnetic simulation software. The parameters of each surface receiving coil in the electromagnetic simulation are as follows:

[0067] The magnetic resonance surface receiving coil based on inner ear imaging consists of two layers of surface receiving coils; the outer surface receiving coil 1 is rectangular, with the long side of the rectangle being 200 mm and the short side being 60 mm. Each side of the rectangle is connected through a capacitor or a port at the four corners, where one corner is a port and three corners are capacitors, and the capacitance value of each capacitor is 130 pF; the inner surface receiving coil 2 is square, with the side length of the square being 50 mm. Each side of the square is connected through a capacitor or a port at the four corners, where one corner is a port and three corners are capacitors, and the capacitance value of each capacitor is 36 pF.

[0068] The positional distribution of the inner and outer two layers of coils is as Figure 1 shown, where 8 outer surface receiving coils 1 are distributed around the head, and the distance between the geometric center of each coil and the geometric center of the outer surface receiving coil group is 115 mm; 4 inner surface receiving coils 2 are distributed closely to the ear and are connected to the nearest outer surface receiving coil 1 through a capacitor with a capacitance of 9.1 pF; the material of each side of the surface receiving coil is annealed copper. Specifically, each inner surface receiving coil 2 is placed as close as possible to the target imaging area without causing other effects, because the closer it is, the stronger the received signal.

[0069] Construct the 1.5T inner ear magnetic resonance imaging of the traditional surface receiving coil group:

[0070] Use the outer surface receiving coil 1 in the magnetic resonance surface receiving coil group to simulate a traditional surface receiving coil group with similar performance, as Figure 6 shown. Among them, the traditional surface receiving coil group is as Figures 7 - 9As shown, according to the reciprocity theorem, the receiving performance of coil groups can be compared by comparing the transmitting performance of coil groups under the same total transmitted power. Using each surface receiving coil as a transmitting coil and ensuring that the total transmitted power remains unchanged, the depth of induction of the radio frequency (RF) field is measured by the penetration depth of the RF field of the coil group, and the signal intensity from a specific area in the received signal is measured by the RF field intensity in that area.

[0071] Import the head of the male human model Gustav, adjust the position of the human model to the center of the simulated traditional surface receiving coil group, use the ports of each coil of the simulated surface receiving coil group as excitation sources, and normalize the transmitted power of each port to 1 W, with a total transmitted power of 8 W. Using probes located in the inner ear regions of the left and right ears respectively, it is observed that the simulated traditional surface receiving coil group operates at the Larmor frequency of 63.8 MHz at 1.5 T, as Figure 10 shown. Observe the RF field distribution of the longitudinal section at the center position of the human head model when using the simulated traditional surface receiving coil group. The RF field distribution is as Figure 11 shown.

[0072] Construct a 1.5 T inner ear magnetic resonance imaging (MRI) with a multi-layer interconnected composite parallel surface receiving coil group:

[0073] Import the head of the male human model Gustav, adjust the position of the human model to the center of the multi-layer interconnected composite parallel surface receiving coil group, finely adjust the inner surface receiving coils to positions close to the ears, use the ports of each coil in the magnetic resonance surface receiving coil based on inner ear imaging as excitation sources, normalize the transmitted power of each port to 0.67 W, and keep the total transmitted power unchanged at 8 W. Using probes located in the inner ear regions of the left and right ears respectively, it is observed that the magnetic resonance surface receiving coil based on inner ear imaging also operates at 63.8 MHz, as Figure 12 shown. Observe the RF field distribution of the longitudinal section at the center position of the human head model when using the magnetic resonance surface receiving coil based on inner ear imaging. The RF field distribution is as Figure 13 shown.

[0074] Compare Figure 10 and Figure 12 , it can be seen that: when using the simulated traditional surface receiving coil group, the RF field strength - frequency curves received by the probes at symmetric positions are almost coincident; when using the magnetic resonance surface receiving coil based on inner ear imaging, the trends of the RF field strength - frequency curves received by the probes at symmetric positions are the same, but there are differences in amplitude. This is because the shape of the head of the imported male human model Gustav is not completely symmetric, and the inner surface receiving coil 2 of the magnetic resonance surface receiving coil based on inner ear imaging cannot achieve complete symmetry due to being close to the ears, resulting in a slight impact on the imaging effect of the left and right inner ear regions which are also not completely symmetric.

[0075] Comparison Figure 11 and Figure 13 , it can be seen that: when using the simulated traditional surface receiving coil group, the penetration depth of the radiofrequency field is relatively shallow, only reaching the superficial tissues or organs, and the radiofrequency field in the inner ear of the target area is weak; when using the magnetic resonance surface receiving coil based on inner ear imaging, the radiofrequency field is concentrated in the inner ear of the target area, the radiofrequency field in the inner ear of the target area is significantly enhanced, and the radiofrequency field in the middle area between the inner and outer layer surface receiving coils is weak, and the coupling between the inner and outer layer surface receiving coils is suppressed.

[0076] As a multi-layer interconnected surface receiving coil group, the present application improves the deficiency that the radiofrequency field induction depth of the traditional surface receiving coil cannot meet the inner ear imaging requirements while maintaining high sensitivity; the surface receiving coils at multiple different positions in the inner and outer layers are combined for parallel imaging, providing the possibility to display more inner ear anatomical details in magnetic resonance imaging. The outer layer surface receiving coil 1 is distributed in a ring around the head and can receive signals from all directions of the inner ear in the target area from different angles; the inner layer surface receiving coil 2 is closely attached to the ear and can sensitively receive the signals of the inner ear in the target area. The inner layer surface receiving coil 2 has approximately the same size as the inner ear in the target area and has a smaller radiofrequency field induction depth, while the size of the outer layer surface receiving coil 1 is larger compared to the inner layer surface receiving coil 2 and has a larger radiofrequency field induction depth; the corresponding size is determined according to the position of the surface receiving coil, so that the radiofrequency field induction depths of the inner and outer layer surface receiving coils both meet the requirements of inner ear imaging. There is electromagnetic coupling between the inner and outer layer surface receiving coils, which is relatively strong between the inner layer surface receiving coil 2 and the adjacent outer layer surface receiving coil 1. A capacitive / inductive decoupling lumped network is used to connect the inner and outer layer surface receiving coils to weaken the electromagnetic coupling between the inner and outer layer coils. The surface receiving coils in the inner and outer layers receive the composite signals from different positions in the inner ear of the target area in parallel, and cooperate with an efficient image reconstruction algorithm to cope with the challenge of weak signals of small voxels.

[0077] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0078] In this article, specific examples are used to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A magnetic resonance surface receiving coil based on inner ear imaging, characterized in that, The magnetic resonance surface receiving coil based on inner ear imaging includes: an outer layer surface receiving coil module, an inner layer surface receiving coil module, and a capacitance / inductance decoupling total network; The outer layer surface receiving coil module includes one or more layers of outer layer surface receiving coil groups; each layer of the outer layer surface receiving coil group includes a plurality of outer layer surface receiving coils; the plurality of outer layer surface receiving coils are distributed in a ring around the head of the target object; The inner layer surface receiving coil module is arranged between the outer layer surface receiving coil module and the head of the target object; the inner layer surface receiving coil module includes one or more layers of inner layer surface receiving coil groups; each layer of the inner layer surface receiving coil group includes a plurality of inner layer surface receiving coils; the inner layer surface receiving coils are arranged in the target area of the ear of the target object; The size of the outer layer surface receiving coil is larger than that of the inner layer surface receiving coil; the inner layer surface receiving coil is connected to the outer layer surface receiving coil within a set range through the capacitance / inductance decoupling total network.

2. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 1, wherein The outer layer surface receiving coil is rectangular; the inner layer surface receiving coil is square.

3. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 1, wherein The outer layer surface receiving coils are arranged at intervals; the inner layer surface receiving coils are arranged at intervals.

4. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 2, characterized in that, The outer layer surface receiving coil includes a first outer coil side, a second outer coil side, a third outer coil side, a fourth outer coil side, a plurality of outer capacitors, and an outer port; The first outer coil side and the second outer coil side are connected by one of the outer capacitors; the second outer coil side and the third outer coil side are connected by one of the outer capacitors; the third outer coil side and the fourth outer coil side are connected by one of the outer capacitors; the fourth outer coil side and the first outer coil side are connected by an outer port; zero or more outer capacitors are arranged on the first outer coil side, the second outer coil side, the third outer coil side, and the fourth outer coil side; The inner layer surface receiving coil includes a first inner coil side, a second inner coil side, a third inner coil side, a fourth inner coil side, a plurality of inner capacitors, and an inner port; The first inner coil side and the second inner coil side are connected by one of the inner capacitors; the second inner coil side and the third inner coil side are connected by one of the inner capacitors; the third inner coil side and the fourth inner coil side are connected by one of the inner capacitors; the fourth inner coil side and the first inner coil side are connected by an inner port; zero or more inner capacitors are arranged on the first inner coil side, the second inner coil side, the third inner coil side, and the fourth inner coil side.

5. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 2, wherein, The outer layer surface receiving coil includes a first outer coil side, a second outer coil side, a third outer coil side, and a fourth outer coil side connected in sequence; the fourth outer coil side is also connected to the first outer coil side; the outer layer surface receiving coil further includes a plurality of outer capacitors and an outer port; An outer capacitor is provided at the center of each of the first outer coil side, the second outer coil side, and the third outer coil side; an outer port is provided at the center of the fourth outer coil side; one or more outer capacitors are provided on the first outer coil side, the second outer coil side, and the third outer coil side; The inner surface receiving coil includes a first inner coil side, a second inner coil side, a third inner coil side, and a fourth inner coil side connected in sequence; the fourth inner coil side is also connected to the first inner coil side; the inner surface receiving coil further includes a plurality of inner capacitors and an inner port; An inner capacitor is provided at the center of each of the first inner coil side, the second inner coil side, and the third inner coil side; an inner port is provided at the center of the fourth inner coil side; one or more inner capacitors are provided on the first inner coil side, the second inner coil side, and the third inner coil side.

6. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 4 or 5, characterized in that, One or more outer capacitors are provided on the fourth outer coil side; one or more inner capacitors are provided on the fourth inner coil side.

7. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 1, characterized in that The materials of the outer surface receiving coil and the inner surface receiving coil are both conductor materials.

8. The magnetic resonance surface receiving coil based on inner ear imaging according to claim 7, wherein The materials of the outer surface receiving coil and the inner surface receiving coil are both annealed copper.

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