MRI eye coil device

Abstract

The present application discloses a magnetic resonance imaging eye coil device, which comprises a front coil and a rear coil arranged in a front-to-back spacing, wherein the front coil comprises at least two coil units located directly in front of the eyes of a human body during imaging examination. The present application can perform high-quality nuclear magnetic resonance imaging of the eyes of a human body.

Description

Technical Field

[0001] The present application relates to the field of magnetic resonance imaging, and in particular to an eye radio frequency receiving coil device for magnetic resonance imaging. Background Art

[0002] The magnetic resonance imaging system is a medical imaging device, in which the radio frequency (RF) receiving coil is an important component. The role of the RF receiving coil can be likened to that of an adult's eyes, and the final clarity of the image is directly proportional to its signal-to-noise ratio (sensitivity). In order to improve the clarity of the image (or signal-to-noise ratio, or sensitivity), the first starting point of general coil design is to determine the shape and size of the coil, which should be neither too large nor too small. Because if the coil size is too large, the clarity of the magnetic resonance image will be reduced; and if it is too small, a considerable proportion of the patient's specific parts may not be placed inside the coil. Therefore, the first principle of coil design is to make the coil size as small as possible and as close to the scanned part or object as possible while meeting the size of the scanned part or object.

[0003] Therefore, when scanning different parts of the human body, special coils are generally needed to obtain the best image effect. For example, the coil for scanning the head is called the head coil, the coil for scanning the knee joint is called the knee joint coil, and the coil for scanning the eye is called the eye coil or eye coil. The use of special coils in magnetic resonance scanning helps to greatly improve the performance of clinical images. Summary of the invention

[0004] The purpose of this application is to provide a magnetic resonance imaging eye coil device with high imaging quality.

[0005] In order to achieve the above purpose, the technical solution of this application is:

[0006] A magnetic resonance imaging eye coil device comprises a front coil and a rear coil arranged in a front-to-back manner, wherein the front coil comprises at least two coil units located in front of both eyes of a human body during imaging examination.

[0007] The front coil is composed of four coil units arranged in sequence along the arc direction. During imaging examination, the two coil units in the middle are respectively located in front of the left and right eyes of the human body.

[0008] Among the four coil units constituting the front coil, except for two adjacent coil units in the middle, any two adjacent coil units are arranged crosswise.

[0009] Among the four coil units constituting the front coil, a common capacitor for decoupling is arranged between two adjacent coil units in the middle.

[0010] The rear coil comprises at least two coil units which are respectively located directly behind the eyes of the examinee during imaging examination.

[0011] The rear coil is composed of four coil units arranged in sequence along an arc direction. Among the four coil units constituting the rear coil, the two coil units in the middle are located directly behind the eyes of the human body.

[0012] Among the four coil units constituting the rear coil, any two adjacent coil units are arranged crosswise.

[0013] It also includes a head-mounted coil shell adapted to the human head and a head support seat for supporting the human head. The upper part of the head support seat is formed with a head placement cavity for accommodating the human head. The front coil is arranged in the coil shell, and the rear coil is arranged in the head support seat.

[0014] The head support seat is provided with a wiring socket, and the coil housing is connected to a wiring plug matching the wiring socket via a cable, and the cable is connected to the front coil circuit.

[0015] The coil housing comprises a hard shell and a bendable flexible sheath connected to the hard shell. The circuit board connected to the coil is fixedly arranged in the hard shell, and the coil is placed in the flexible sheath.

[0016] During imaging examination, a common capacitor for decoupling is arranged between the two coil units respectively located in front of the examinee's eyes, and a nose clearance notch corresponding to the human nose and located near the common capacitor is opened on the coil shell.

[0017] The advantages of this application are:

[0018] 1. The coil shell of the eye coil device of the present application is provided with a nose clearance notch corresponding to the human nose and two eye clearance holes corresponding to the human eyes, and a strap is connected to the coil shell for binding and fixing it to the human head. The nose clearance notch and eye clearance holes provided on the coil shell can provide clearance space for the nose and eyes of the wearer, so that the wearer's face can be as close to the inner side of the coil shell as possible, and then the coil can be as close to the human eye as possible, so as to obtain a clearer eye image. In addition, after the inspected person wears the coil shell (during non-inspection time), he can observe the surrounding environment through the eye clearance holes, thereby reducing his pressure. The strap can firmly bind the coil shell to the position of the human head, which can not only prevent the coil shell from detaching from the eye position during the inspection process, but also allow the coil in the coil shell to be closer to the eye.

[0019] 2. The coil shell is not entirely made of hard material. It includes a hard shell and a flexible sheath connected to the hard shell that can be bent. The circuit board connected to the front coil is fixed in the hard shell, so that the hard shell protects the circuit board and prevents the circuit board from being bent and broken. The front coil is set in the flexible sheath. When the coil shell is worn on the head of the examinee, the flexible sheath of the coil shell can be bent according to the examinee's head shape, so that the inner side of the coil shell facing the examinee's head can contact the examinee as much as possible, so that the coil in the coil shell bends together with the flexible sheath of the shell and is close to the examinee's head (especially the eyes) over a large area, further improving the imaging effect of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the magnetic resonance imaging eye coil device according to an embodiment of the present application;

[0021] Figure 2 This is one of the partial structural schematic diagrams of the magnetic resonance imaging eye coil device according to an embodiment of the present application;

[0022] Figure 3 This is the second partial structural schematic diagram of the magnetic resonance imaging eye coil device according to the embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of the coil in the magnetic resonance imaging eye coil device according to an embodiment of the present application.

[0024] Among them: 1-coil shell, 1a-hard shell, 1b-flexible sheath, 1bb-deformation seam, 101-nose clearance notch, 102-eye clearance hole, 2-front coil, 3-strap, 4-head support seat, 401-limit baffle, 402-limit back plate, 5-inflatable airbag, 6-inflatable tube, 7-inflatable handle, 8-wiring socket, 9-wiring plug, 10-cable, 11-rear coil. DETAILED DESCRIPTION

[0025] The present application is further described in detail below through specific implementations in combination with the accompanying drawings. The present application can be implemented in a variety of different forms and is not limited to the implementation described in this embodiment. The purpose of providing the following specific implementations is to facilitate a clearer and more thorough understanding of the disclosure of the present application, wherein words indicating directions such as up, down, left, and right are only for the position of the structure shown in the corresponding drawings.

[0026] However, those skilled in the art may realize that one or more of the specific details may be omitted, or other methods, components or materials may be used. In some examples, some embodiments are not described or are not described in detail.

[0027] In addition, the technical features and technical solutions described herein may be combined in any suitable manner in one or more embodiments. It is easy for a person skilled in the art to understand that the steps or operation sequence of the methods related to the embodiments provided herein may also be changed. Therefore, any sequence in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain sequence unless it is explicitly stated that a certain sequence is required.

[0028] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0029] Figures 1 to 4 A preferred embodiment of the eye coil device for magnetic resonance imaging of the present application is shown. Figure 1 As shown, the coil device of this embodiment mainly includes a coil housing 1, in which a coil is arranged, and the shape of the coil housing 1 is adapted to the human head so that the examinee can wear it on the head. In this embodiment, the coil housing is roughly in a semicircular shape, similar to an eye mask. In actual application, the coil housing 1 is worn on the examinee's head, and the coil (RF receiving coil) in the coil housing 1 is just at the eye position, and the magnetic resonance device is turned on to perform magnetic resonance imaging of the eye using the coil.

[0030] In order to obtain a clearer eye image, the coil should be placed as close to the human eye as possible when performing magnetic resonance imaging of the human eye. Based on this principle, in this embodiment, a nose clearance notch 101 corresponding to the human nose and two eye clearance holes 102 corresponding to the human eyes are provided on the coil housing 1, and a strap 3 for binding and fixing the coil housing 1 to the human head is connected.

[0031] It is not difficult to understand that the nose clearance notch 101 and the eye clearance hole 102 set on the coil housing 1 can provide clearance space for the wearer's nose and eyes, so that the wearer's face can be as close to the inner side of the coil housing 1 as possible, and the coil can be as close to the human eye as possible. In addition, after the inspected person wears the coil housing 1 (during non-inspection time), he can observe the surrounding environment through the eye clearance hole 102, thereby reducing his pressure. The strap 3 can firmly bind the coil housing 1 to the human head to prevent the coil housing 1 from detaching from the eye position during the inspection process.

[0032] In addition, in this embodiment, a strap 3 for tying and fixing the coil housing 1 to the human head is connected to the coil housing 1. In actual application, the strap 3 can be used to firmly tie the coil housing 1 to the human head to prevent the coil housing 1 from detaching from the eye position during the inspection process.

[0033] The coil housing 1 includes a hard shell 1a, which is specifically made of PC material. The circuit board connected to the coil is fixedly arranged in the hard shell, so that the hard shell protects the circuit board and prevents the circuit board from being bent and broken. In addition, a wire outlet hole is formed on the hard shell, and the cable 10 described below is led out from the wire outlet hole, so that the cable 10 can be prevented from being frequently bent and loosened at the lead-out position.

[0034] However, the coil housing 1 in this embodiment is not entirely made of hard material, and it also includes a bendable flexible sheath 1b of EVA material connected to the hard shell, and the coil in the coil housing 1 is arranged (partially or entirely) in the flexible sheath 1b. The advantage of such a design is that when the coil housing is worn on the head of the examinee, the flexible sheath of the coil housing can be bent according to the shape of the examinee's head, so that the inner side of the coil housing facing the examinee's head can contact the examinee as much as possible, so that the coil in the coil housing is bent together with the flexible sheath of the housing and is close to the examinee's head (especially the eyes) over a large area, further improving the imaging effect of the coil.

[0035] In order to improve the deformation ability of the flexible sheath 1b, in this embodiment, four linear deformation seams 1bb are further provided on the surface of the flexible sheath 1b. The deformation seams 1bb can assist the bending deformation of the flexible sheath 1b.

[0036] Of course, we may not use a strap to fix the coil housing 1, but use other mechanical devices to ensure that the coil housing 1 is as close to the eye to be examined as possible.

[0037] In order to facilitate the formation of the nose clearance notch 101 and make the nose clearance notch 101 fit the human nose better, the nose clearance notch 101 in this embodiment is a V-shaped notch, which is arranged in the middle position of the length direction of the coil housing 1. Two eye clearance holes 102 are symmetrically arranged on the left and right sides of the nose clearance notch 101, and the two eye clearance holes 102 are holes that are approximately parallelograms.

[0038] The above-mentioned strap 3 is an elastic strap, which is suitable for various head circumference sizes and does not need to be tied when worn, which is very convenient.

[0039] Refer to Figure 2 and Figure 3As shown, in order to fix the head of the examinee and prevent the head from moving during the imaging examination, which may cause the imaging part to shift or the imaging quality to deteriorate, the present embodiment further provides a head support seat 4 for supporting the human head. The upper portion of the head support seat 4 is formed with a head placement cavity for accommodating the human head, which is used in conjunction with the above-mentioned coil housing 1 with a coil.

[0040] Specifically, the upper part of the head support seat 4 is formed with two limit baffles 401 spaced apart on the left and right and a limit back plate 402 connected between the two limit baffles, and the above-mentioned head placement cavity is formed by the above-mentioned limit back plate 402 and the above-mentioned two limit baffles 401.

[0041] Furthermore, the distance between the two limit baffles 401 is greater than the width of the coil housing 1 , so that the coil housing 1 can be placed between the two limit baffles 401 .

[0042] Reference Figure 3 As shown, in actual application, the examinee first wears the coil housing 1, then lies flat and places the head in the head placement cavity of the head support seat 4, and the coil housing 1 is just in the aforementioned head placement cavity. An inflatable airbag 5 is sandwiched between each limit baffle 401 and the coil housing 1. There are two limit baffles 401, so there are two inflatable airbags 5. The head support seat 4 uses the aforementioned inflatable airbag 5 to achieve flexible positioning of the coil housing 1 to prevent the examinee's head from moving during the imaging examination.

[0043] The two inflatable airbags 5 are connected to the same inflatable handle 7 via a bifurcated inflating tube 6. In actual use, the two inflatable airbags 5 can be inflated / deflated by squeezing the inflatable handle 7, which is very convenient.

[0044] In this embodiment, a wiring socket 8 is provided on the head support seat 4, and the coil housing 1 is connected to a wiring plug 9 matching the wiring socket 8 through a cable 10, and the cable 10 is connected to the coil in the coil housing 1. The wiring socket 8 is connected to the host part of the nuclear magnetic imaging device in a circuit, and the wiring plug 9 is inserted into the wiring socket 8 in actual application, thereby realizing the circuit connection between the coil and the host of the nuclear magnetic imaging device.

[0045] It can be seen that the circuit of nuclear magnetic imaging is first connected to the head support seat 4, and then led to the coil in the head-mounted coil housing 1 through the aforementioned wiring socket 8, wiring plug 9 and cable 10. This is because, in actual application, the head support seat 4 is always in a fixed static state, while the coil housing 1 is often in motion. The circuit of the main part of the nuclear magnetic imaging device is first connected to the fixed head support seat 4, and then led to the coil housing 1 that often needs to be moved using a shorter cable, which is more convenient and safe to use. In addition, the coil housing 1 with an eye coil is connected to the head support seat 4 through a pluggable circuit structure, so that the coil housing 1 can be easily separated from the head support seat 4, which is convenient for the maintenance or replacement of the coil housing 1.

[0046] In addition, this embodiment also has a group of coils in the head support seat 4. For the convenience of description, this application refers to the coil in the head support seat 4 as the rear coil 11 (located behind the head of the examinee) and the coil in the coil housing 1 as the front coil 2 (located in front of the head of the examinee) according to the different positions of the coils during imaging examinations, and takes the examinee's head as a reference. The wiring socket 8 on the head support seat 4 is connected to the main system circuit of the magnetic resonance imaging, and the front coil 2 is connected to the wiring socket 8 circuit through the cable 10 and the wiring plug at the end of the cable 10, so that the front coil 2 is connected to the main system circuit.

[0047] During the imaging examination, the rear coil 11 and the front coil 2 cooperate with each other, one is located directly in front of the examinee's head and very close to the eyes, and the other is located directly behind the examinee's head. The two cooperate with each other to form an image of the examinee's eyes, which is much clearer than using only one coil - the front coil for imaging.

[0048] In order to further optimize the imaging clarity of the eye, the front coil 2 in this embodiment is composed of four coil units, which are arranged in sequence along the arc direction, and during the imaging examination, the two middle coil units are respectively located in front of the human eyes, and a common capacitor (not marked in the figure) is arranged between the two middle coil units to decouple the two coil units. The other two coil units (i.e., the two coils at the end) and the two middle coils are arranged crosswise (partially overlapped), and partial overlap decoupling is adopted. In other words: among the four coil units constituting the front coil 2, except for the two adjacent coil units in the middle, any two adjacent coil units adopt partial overlap decoupling. The common capacitor decoupling is adopted between the two adjacent coil units in the middle. The reason why the two middle coils adopt common capacitor decoupling instead of overlapping decoupling is to ensure that the nose clearance notch 101 on the coil housing 1 has a large enough space-the nose clearance notch 101 is arranged near the common capacitor.

[0049] The rear coil 11 is also composed of four coil units, which are also arranged in sequence along the arc direction, and any two adjacent coil units are arranged crosswise (partially overlapped), that is, any adjacent coil units are partially overlapped and decoupled. In addition, during the imaging examination, the two middle coil units are respectively located directly behind the human eyes.

[0050] The front coil 2 and the rear coil 11 are roughly distributed on the same circular ring front and back.

[0051] It should be noted that the number of coil units in the front coil 2 and the rear coil 11 is not limited to four, and may be two, three or five, etc., preferably more than two. In addition, it is preferred that two coil units in the front coil 2 are located just in front of the examinee's eyes.

[0052] The above contents are further detailed descriptions of the present application in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application.

Claims

1. A magnetic resonance imaging eye coil device, characterized in that , comprising a front coil (2) and a rear coil (11) arranged in a front-to-back manner, wherein the front coil (2) comprises at least two coil units respectively located in front of the eyes of the subject during the imaging examination; The front coil (2) is composed of four coil units arranged in sequence along an arc direction. During imaging examination, the two coil units in the middle are located directly in front of the eyes of the person being examined. The rear coil (11) is composed of four coil units arranged in sequence along an arc direction, and among the four coil units constituting the rear coil (11), the two coil units located in the middle are located directly behind the eyes of the person being examined during imaging examination; It also includes a head-mounted coil housing (1) adapted to fit a human head, the coil housing (1) comprising a hard shell and a bendable flexible sheath (1b) connected to the hard shell (1a), a circuit board connected to the front coil is fixedly arranged in the hard shell (1a), and the front coil is arranged in the flexible sheath (1b) and bends along with the bending of the flexible sheath.

2. The magnetic resonance imaging eye coil device according to claim 1, characterized in that: Among the four coil units constituting the front coil (2), except for two adjacent coil units in the middle, any two adjacent coil units are arranged crosswise.

3. The magnetic resonance imaging eye coil device according to claim 2, characterized in that: Among the four coil units constituting the front coil (2), a common capacitor for decoupling is arranged between two adjacent coil units in the middle.

4. The magnetic resonance imaging eye coil device according to claim 1, characterized in that: It also comprises a head support seat (4) for supporting a human head, wherein a head placement cavity for accommodating a human head is formed on the upper part of the head support seat (4), and the rear coil (11) is arranged in the head support seat (4).

5. The magnetic resonance imaging eye coil device according to claim 4, characterized in that: The head support seat (4) is provided with a wiring socket (8), the coil housing (1) is connected to a wiring plug (9) matching the wiring socket (8) via a cable (10), and the cable (10) is connected to the circuit of the front coil (2).

6. The magnetic resonance imaging eye coil device according to claim 1, characterized in that: The surface of the flexible sheath (1b) is provided with a deformation seam (1bb) for assisting the flexible sheath (1b) in bending and deformation.

7. The magnetic resonance imaging eye coil device according to claim 1, characterized in that: During imaging examination, a common capacitor for decoupling is arranged between the two coil units respectively located in front of the examinee's eyes, and a nose clearance notch (101) corresponding to the human nose and located near the common capacitor is provided on the coil housing (1).

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