MRI-assisted holder and MRI coil device

Abstract

The utility model relates to the technical field of magnetic resonance, in particular to an auxiliary MRI (Magnetic Resonance Imaging) fixer and an MRI coil device. The fixator for assisting MRI comprises a carrier which is formed into a long shape extending in a first direction and is configured to carry an examined animal subjected to magnetic resonance examination, and the body length direction of the examined animal corresponds to the first direction; the anaesthetic mask is installed on the carrier and provided with a mouth and nose receiving cavity which is gradually narrowed in the first direction away from the detected animal, and the anaesthetic mask is configured to receive the mouth and the nose of the detected animal through the mouth and nose receiving cavity and provide anaesthetic support for the detected animal; the tooth tractor is configured to pull teeth of the detected animal in the first direction away from the detected animal, so that the head of the detected animal abuts against the cavity wall of the mouth and nose receiving cavity, and movement of the head is limited.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic resonance, especially to a fixing device for auxiliary MRI and MRI coil equipment. BACKGROUND

[0002] For example, the physiological structure and metabolic process of small animals such as mice have certain similarities with humans, and the results of nuclear magnetic resonance research on small animals can provide analogies and inspirations for the research of human-related diseases.

[0003] When performing magnetic resonance imaging (MRI) on small animals, the small animals need to be fixed to ensure that the small animals maintain a stable body position during the magnetic resonance scanning process and reduce image blurring and distortion caused by movement.

[0004] In the past, the assembly for fixing the subject animal cannot be completely separated from the MRI coil equipment, so the other parts of the coil equipment may interfere with the fixation of the subject animal, making the preparation work before magnetic resonance imaging scanning difficult. In addition, the traditional assembly for fixing the subject animal has poor adaptability to subject animals of different sizes (especially length). Furthermore, the traditional assembly for fixing small subject animals needs to be further optimized in terms of structural design. SUMMARY

[0005] To solve at least one of the above technical problems, the utility model provides a fixing device for auxiliary MRI and MRI coil equipment.

[0006] In a first aspect, a fixing device for auxiliary MRI is provided, comprising:

[0007] a carrier formed in an elongated shape extending along a first direction and configured to carry a subject animal being subjected to magnetic resonance examination, wherein the length direction of the subject animal corresponds to the first direction;

[0008] a mask mounted to the carrier and having a mouth and nose receiving cavity gradually narrowing away from the subject animal in the first direction, the mask being configured to receive the mouth and nose of the subject animal through the mouth and nose receiving cavity and provide anesthesia support for the subject animal;

[0009] a tooth retractor configured to pull the teeth of the subject animal away from the first direction of the subject animal, so that the head of the subject animal abuts to the cavity wall of the mouth and nose receiving cavity to limit the movement of the head.

[0010] In some possible implementations, the mouth-nose receiving cavity is formed as a tapered cavity having a first opening facing the first direction toward the subject animal, and the tapered cavity is configured to receive the mouth-nose of the subject animal via the first opening.

[0011] In some possible implementations, the tapered cavity has a second opening continuous with the first opening, the second opening being located at a radial side of the tapered cavity, the second opening being configured to expose and abut against a portion of the head.

[0012] In some possible implementations, the anesthesia mask comprises:

[0013] a mask body defining the mouth-nose receiving cavity;

[0014] an extension extending from a side of the mask body opposite to the subject animal along the first direction, and having a guide hole disposed through in the first direction and in communication with the mouth-nose receiving cavity,

[0015] the dental retractor comprises:

[0016] a dental hook for hooking a tooth of the subject animal within the mouth-nose receiving cavity;

[0017] a pull rod inserted into the guide hole and connected to the dental hook;

[0018] wherein the pull rod is configured to be movable relative to the guide hole along the first direction, and is capable of being held at a plurality of positions along the first direction.

[0019] In some possible implementations, further comprising:

[0020] a jackscrew threadedly engaged with the extension and extending in a direction transverse to the first direction;

[0021] the jackscrew is configured to selectively abut against and depart from a side surface of the pull rod by rotating the jackscrew.

[0022] In some possible implementations, further comprising:

[0023] a clamping assembly operable to have a clamping state and a release state;

[0024] in the clamping state, the clamping assembly clamps the extension, thereby preventing the anesthesia mask from moving along the first direction;

[0025] in the release state, the clamping assembly releases the extension, thereby allowing the anesthesia mask to move along the first direction;

[0026] The clamping assembly comprises:

[0027] a first clamping member connected to the carrier and having a first clamping slot;

[0028] a second clamping member having a second clamping slot opposite to the first clamping slot so as to define a clamping passage extending along the first direction, wherein the extension is inserted into the clamping passage;

[0029] a first screw connecting the second clamping member to the first clamping member and capable of selectively placing the clamping assembly in the clamping state and the releasing state by a rotation operation of the first screw.

[0030] In some possible embodiments, further comprising:

[0031] two ear rods mounted to the carrier and configured to abut inwardly to both ears of the subject animal along a second direction intersecting the first direction so as to limit the head movement of the subject animal.

[0032] A second aspect provides an MRI coil apparatus, comprising:

[0033] a housing;

[0034] the holder as claimed in the first aspect is detachably mounted to the housing;

[0035] a radio frequency coil mounted in the housing for receiving magnetic resonance signals from the subject animal.

[0036] In some possible embodiments, the housing defines a bore extending through in the first direction and a coil mounting cavity located at a peripheral side of the bore, the radio frequency coil is mounted in the coil mounting cavity, the holder is arranged through the bore, and a mounting position of the holder relative to the housing is adjustable along the first direction.

[0037] In some possible embodiments, the carrier comprises a first section and a second section located at opposite sides of the bore along the first direction, the first section has a first elongated hole extending along the first direction, and the second section has a second elongated hole extending along the first direction.

[0038] the holder is detachably mounted to the housing via a third screw and a fourth screw, wherein the third screw is threaded through the first elongated hole and screwed with the housing, and the fourth screw is threaded through the second elongated hole and screwed with the housing.

[0039] The MRI-assisted fixator provided by this invention can be completely detached from the MRI coil device. Therefore, in use, the animal to be examined can be fixed to the fixator first, and then the fixator carrying the animal can be installed into the MRI coil device, simplifying the preparation work before magnetic resonance imaging scanning. Furthermore, the carrier for carrying the animal is formed into an elongated shape extending along the length of the animal, thus avoiding the need for a large carrier and fixator while also being adaptable to animals of different lengths. In addition, the use of a tooth retractor to bring the animal's head against the wall of the narrowed oral-nasal receiving cavity effectively restricts the movement of the animal's head. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0041] Figure 1 This is a plan view of the MRI coil device provided in the first embodiment of the present invention in its use state.

[0042] Figure 2 This illustrates the structure of the tested animal in the first embodiment of the present invention, when it is fixed to the restraint but not yet assembled into the shell.

[0043] Figure 3 yes Figure 1 A schematic diagram of the middle shell structure.

[0044] Figure 4 yes Figure 1 A schematic diagram of the central fixation device.

[0045] Figure 5 This is a schematic diagram of the structure of the MRI coil device provided in the second embodiment of this utility model.

[0046] Figure 6 yes Figure 5 A schematic diagram of the central fixation device.

[0047] Figure 7 yes Figure 6 A schematic diagram of the structure of a mid-tooth retraction device.

[0048] Figure 8 This is a schematic diagram of the structure of the MRI coil device provided in the third embodiment of this utility model.

[0049] Figure 9 yes Figure 8 A schematic diagram of the central fixation device.

[0050] Explanation of reference numerals in the attached figures:

[0051] AA - subject animal;

[0052] F1 - first direction, F2 - second direction, F3 - third direction;

[0053] 1 - housing, 1a - bore, 1b - coil mounting cavity;

[0054] 2 - radio frequency coil;

[0055] 3 - retainer;

[0056] 4 - carrier, 4a - first elongated aperture, 4b - second elongated aperture, 4c - recess, 4d - guide rail, 41 first section, 42 - second section;

[0057] 5 - ear bar;

[0058] 6 - anesthesia mask, 6a - mask body, 6b - extension, 6c - mouth and nose receiving cavity, 6d - first opening, 6e - second opening;

[0059] 7 - clamping assembly;

[0060] 8 - first clamping member, 8a - guide slot;

[0061] 9 - second clamping member;

[0062] 10 - clamping channel;

[0063] 11 - first bolt;

[0064] 12 - second bolt;

[0065] 13 - third bolt;

[0066] 14 - fourth bolt;

[0067] 15 - tooth distractor;

[0068] 16 - pull rod;

[0069] 17 - dental hook;

[0070] 18 - jackscrew. DETAILED DESCRIPTION

[0071] For the purpose, technical scheme and advantages of the present application to be clearer, the technical scheme of the present application will be described clearly and completely in combination with the drawings of the present application embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0072] In the description of the present application and the claims, if there are terms such as "first", "second", etc., they are only used to distinguish the described objects, and do not have any order or technical meaning. Therefore, the objects defined with "first", "second", etc. can be explicitly or implicitly included one or more objects. And "one" or "an" and similar words do not represent a quantity limit, but represent the existence of at least one, and "more" represents no less than two.

[0073] Figure 1 A schematic diagram of the MRI coil device provided by the first embodiment of the present application in use is shown, which can be used for magnetic resonance imaging scanning of a subject animal AA, for example, and includes a housing 1, a radio frequency coil 2 and a holder 3. In addition, Figure 2 The structure is shown when the subject animal AA is fixed to the holder 3 but not yet assembled to the housing 1, Figure 3 The housing 1 is shown alone, Figure 4 The holder 3 is shown alone.

[0074] The housing 1 is a component for mounting and protecting the radio frequency coil 2, which defines a through hole cavity 1a in a first direction F1 and a coil mounting cavity 1b located at the outer peripheral side of the hole cavity 1a, wherein the coil mounting cavity 1b is a closed cavity and surrounds the hole cavity 1a on the full circumference around the axis of the hole cavity 1a.

[0075] The radio frequency coil 2 is mounted in the coil mounting cavity 1b of the housing 1, and the related electronic devices (such as preamplifiers and traps) electrically coupled with the radio frequency coil 2 are also mounted in the coil mounting cavity 1b. The radio frequency coil 2 is used to receive magnetic resonance signals from the subject animal AA. In addition, the radio frequency coil 2 can be configured as a plurality, and the plurality of radio frequency coils 2 are arranged into a coil array at the outer peripheral side of the hole cavity 1a.

[0076] The holder 3 is used to fix and carry the animal under examination AA, and is configured to be detachably mounted to the housing 1 in the manner of being inserted into the bore cavity la after the animal under examination AA is fixed to the holder 3. In other words, in use, the animal under examination AA can be first fixed to the holder 3, and then the holder 3 carrying the animal under examination AA is mounted to the housing 1 in the manner of being inserted into the bore cavity la. In this way, the fixing work on the body of the animal under examination AA can be performed in a larger space outside the bore cavity la, without being limited by the space of the bore cavity la, so as to simplify the use of the device.

[0077] The holder 3 includes a carrier 4, two ear bars 5, and an anesthesia mask 6.

[0078] The carrier 4 is formed in an elongated shape extending along a first direction F1, and is configured to carry the animal under examination AA for magnetic resonance examination, wherein the lengthwise direction of the animal under examination AA corresponds to the first direction F1. That is, the carrier 4 carries the animal under examination AA in such a way that the lengthwise direction of the animal under examination AA follows the extension direction of the carrier 4.

[0079] In the present embodiment, the carrier 4 is formed in a substantially arc-shaped strip shape, and based on this, the carrier 4 has a groove 4c extending along the first direction F1, which is configured to receive the body of the animal under examination AA. During the magnetic resonance imaging scan of the animal under examination AA, the groove 4c helps to suppress the movement of the animal under examination AA, thereby helping to obtain high-quality magnetic resonance images. In addition, the aforementioned two ear bars 5 are respectively arranged on opposite sides of the groove 4c along the width direction (second direction F2) thereof.

[0080] The two ear bars 5 are mounted to the carrier 4, and are configured to abut inwardly to the ears of the animal under examination AA along a second direction F2 intersecting the first direction F1, thereby limiting the head movement of the animal under examination AA. In the present embodiment, the second direction F2 is perpendicular to the first direction F1, and corresponds to the left-right direction of the animal under examination AA.

[0081] The anesthesia mask 6 is mounted to the carrier 4, and has a mouth-nose receiving cavity 6c gradually narrowing away from the animal under examination AA along the first direction F1. The anesthesia mask 6 is configured to receive the mouth and nose of the animal under examination AA with the mouth-nose receiving cavity 6c, and to provide anesthesia support for the animal under examination AA.

[0082] And, the mounting position of the anesthesia mask 6 relative to the carrier 4 along the first direction Fl is adjustable by means of the clamping assembly 7 to adapt to different sizes of the subject animal AA or to adapt to different MRI needs. Specifically, the clamping assembly 7 is operable to have a clamping state and a releasing state, in the clamping state, the clamping assembly 7 clamps the extension 6b so as to prevent the anesthesia mask 6 from moving along the first direction Fl, in the releasing state, the clamping assembly 7 releases the extension 6b so as to allow the anesthesia mask 6 to move along the first direction Fl.

[0083] More specifically, the clamping assembly 7 comprises a first clamping piece 8, a second clamping piece 9 and a first bolt 11. The anesthesia mask 6 comprises a mask body 6a defining the aforementioned oral-nasal receiving cavity 6c and an extension 6b extending out of the mask body 6a in the first direction Fl opposite to the subject animal AA.

[0084] The first clamping piece 8 is connected to the carrier 4 and has an arc-shaped first clamping groove, the reference of which is omitted.

[0085] The second clamping piece 9 has an arc-shaped second clamping groove, the reference of which is omitted, the second clamping groove is opposite to the first clamping groove so as to define a clamping passage 10 extending through along the first direction Fl. The extension 6b of the anesthesia mask 6 is inserted into the clamping passage 10.

[0086] The two first bolts 11 connect the second clamping piece 9 to the first clamping piece 8, and by rotating operation of the first bolts 11, the clamping assembly 7 can be selectively in the aforementioned clamping state and releasing state. In the clamping state, the first bolts 11 press the second clamping piece 9 towards the first clamping piece 8, the first clamping piece 8 is close to the second clamping piece 9, the clamping passage 10 is contracted to clamp the extension 6b, so as to prevent the anesthesia mask 6 from moving along the first direction Fl, that is, to fix the anesthesia mask 6 in the current position; in the releasing state, the first bolts 11 make the second clamping piece 9 away from the first clamping piece 8, the clamping passage 10 is expanded to release the extension 6b, so as to allow the anesthesia mask 6 to move along the first direction Fl.

[0087] And, the connection position of the first clamping piece 8 relative to the carrier 4 along the first direction Fl is also adjustable. In this way, it is helpful to increase the position adjustment range of the anesthesia mask 6 in the first direction Fl.

[0088] Specifically, the first clamping piece 8 is connected to the carrier 4 via a connecting assembly, the connecting assembly comprises a guide groove 8a formed on the first clamping piece 8, a guide rail 4d formed on the carrier 4 and a second bolt 12. The guide groove 8a and the guide rail 4d both extend along the first direction Fl, and the guide rail 4d is inserted into the guide groove 8a.

[0089] Two second bolts 12 are threaded through the first clamping member 8 along a third direction F3 intersecting the first direction F1 and are screwed with the first clamping member 8. In the present embodiment, the third direction F3 is perpendicular to the first direction F1 and the second direction F2.

[0090] By rotating operation of the second bolts 12, the guide groove 8a and the guide rail 4d can be selectively brought into the abutting state and the released state. In the abutting state, the second bolts 12 abut against the carrier 4, so that the first clamping member 8 is biased in the third direction F3 away from the carrier 4, and thereby the guide groove 8a and the guide rail 4d are biased away from each other in the third direction F3, and thus the (inner wall surface of the) guide groove 8a and the (side surface of the) guide rail 4d abut against each other in the third direction F3 in close fit (both of their cross sections are formed in a wedge shape), thereby generating a large static friction force between the guide groove 8a and the guide rail 4d, which prevents the first clamping member 8 from moving in the first direction F1. In the released state, the second bolts 12 are away from the carrier 4, and the aforementioned biasing force is released, thereby allowing the first clamping member 8 to move in the first direction F1.

[0091] Further, the mounting position of the holder 3 relative to the housing 1 is adjustable in the first direction F1. Thereby, the position of the examination animal AA relative to the radio frequency coil 2 can be adjusted, thereby changing the examination site of the examination animal AA.

[0092] Specifically, the carrier 4 of the holder 3 comprises a first section 41 and a second section 42 located on opposite sides of the bore 1a in the first direction F1, the first section 41 has a first long slot 4a extending in the first direction F1, and the second section 42 has a second long slot 4b extending in the first direction F1. The holder 3 is detachably mounted to the housing 1 via a third bolt 13 and a fourth bolt 14, wherein the third bolt 13 is threaded through the first long slot 4a and screwed with the housing 1, and the fourth bolt 14 is threaded through the second long slot 4b and screwed with the housing 1.

[0093] Next, please refer to Figure 5 and Figure 6 wherein, Figure 5 an MRI coil apparatus according to a second embodiment of the present application is shown, Figure 6 a holder in Figure 5 is shown. The MRI coil apparatus and the holder in the second embodiment have similar structures to the MRI coil apparatus and the holder 3 in the aforementioned first embodiment, and can be understood by referring to the description of the first embodiment, and for the sake of simplicity, the same or similar components are given the same or similar reference numerals, and the repetitive detailed description of the same parts is omitted. Hereinafter, the differences between the present embodiment and the first embodiment are mainly described.

[0094] In this second embodiment, the holder 3 further comprises a tooth retractor 15. The tooth retractor 15 is configured to retract the teeth of the animal under examination AA in a first direction F1 away from the animal under examination AA, so that the head of the animal under examination AA abuts against the wall of the orinasal receiving cavity 6c, which gradually narrows in the first direction F1 away from the animal under examination AA, so as to better limit the movement of the head of the animal under examination AA. Thus, the anesthesia mask 6 not only provides anesthesia support to the animal under examination AA, but also, together with the ear bar 5, assumes the function of fixing the position of the head of the animal under examination AA.

[0095] The orinasal receiving cavity 6c is formed as a conical cavity having a first opening 6d in the first direction F1 towards the animal under examination, and is configured to receive the orinasal of the animal under examination AA via the first opening 6d.

[0096] The conical cavity constituting the orinasal receiving cavity 6c also has a second opening 6e continuous with the first opening 6d, the second opening 6e being located on the radial side of the conical cavity, the second opening 6e being configured to allow a portion of the head of the animal under examination AA to protrude and abut against it, so as to better fix the head of the animal under examination AA.

[0097] The anesthesia mask 6 comprises a mask body 6a defining the aforementioned orinasal receiving cavity 6c and an extension 6b extending from the side of the mask body 6a opposite the animal under examination AA in the first direction F1. The extension 6b is formed as a cylinder having a guide hole provided therethrough in the first direction F1, so as to communicate with the orinasal receiving cavity 6c.

[0098] The tooth retractor 15 comprises a tooth hook 17 and a pull rod 16. The tooth hook 17 is used to hook the teeth of the animal under examination AA inside the orinasal receiving cavity 6c. The pull rod 16 is inserted into the guide hole and has the tooth hook 17 connected at its end. The pull rod 16 is configured to be movable relative to the guide hole in the first direction F1 and can be held in a plurality of positions in the first direction F1.

[0099] In particular, the top screw 18 is screwed with the extension 6b and extends in a direction transverse to the first direction F1, the top screw 18 being configured to selectively abut against and move away from the lateral surface of the pull rod 16 by rotating the top screw 18. It can be understood that when the top screw 18 abuts against the lateral surface of the pull rod 16, the pull rod 16 is fixed in the first direction F1, and when the top screw 18 moves away from the lateral surface of the pull rod 16, the pull rod 16 is movable in the first direction F1, so as to adjust the position of the pull rod 16 and the tooth hook 17.

[0100] In practice, the tooth hook 17 can be hooked onto the teeth of the animal being tested AA first, and then the lever 16 can be pulled outward along the first direction F1, thereby pulling the head of the animal being tested AA toward the inside of the cover 6a through the tooth hook 17, so that the head of the animal being tested AA abuts against the cavity wall of the oral and nasal receiving cavity 6c for fixation.

[0101] Additionally, the pull rod 16 is configured as a hollow rod with a central through-hole to provide anesthetic gas to the AA (anaphylactic acid) of the test animal. The central through-hole... Figure 7 It is shown in the figure, but the reference numerals are omitted.

[0102] Next, please see Figure 8 and Figure 9 ,in, Figure 8 An MRI coil device according to a third embodiment of the present invention is shown. Figure 9 It shows Figure 8 The fixator in this third embodiment has a similar structure to the MRI coil device and fixator in the first and second embodiments described above. It can be understood with reference to the descriptions of the first and second embodiments. For simplicity, identical or similar components are given the same or similar reference numerals, and repetitive detailed descriptions of their identical parts are omitted. Hereinafter, the differences between this embodiment and the first and second embodiments will be described in detail.

[0103] First, this embodiment omits the ear rod and uses only the anesthesia mask 6 to fix the head of the test animal AA.

[0104] Furthermore, the MRI coil device provided in this embodiment is mainly used for MRI examination of mice, while the MRI coil devices provided in the first and second embodiments are mainly used for MRI examination of rats. Therefore, in order to bring the radio frequency coil 2 as close as possible to the mouse as the test animal AA, in this third embodiment, the diameter of the cavity 1a is smaller than the diameter of the cavity 1a in the first and second embodiments.

Claims

1. An MRI-assisted fixator, characterized by, Comprising: a carrier formed into an elongated shape extending along a first direction and configured to carry a subject animal being subjected to a magnetic resonance examination, wherein a lengthwise direction of the subject animal corresponds to the first direction; a mask mounted to the carrier and having a mouth-nose receiving cavity tapering in the first direction away from the subject animal, the mask being configured to receive a mouth-nose of the subject animal through the mouth-nose receiving cavity to provide anesthetic support to the subject animal; a tooth retractor configured to retract a tooth of the subject animal along the first direction away from the subject animal, thereby causing a head of the subject animal to abut to a cavity wall of the mouth-nose receiving cavity to restrict a movement of the head.

2. The holder of claim 1, wherein The mouth-nose receiving cavity is formed into a tapered cavity having a first opening in the first direction towards the subject animal, and the tapered cavity is configured to receive the mouth-nose of the subject animal via the first opening.

3. The holder of claim 2, wherein The tapered cavity has a second opening continuous with the first opening, the second opening being located at a radial side of the tapered cavity, the second opening being configured to expose and abut to a portion of the head.

4. The holder of claim 1, wherein The mask comprises: a mask body defining the mouth-nose receiving cavity; an extension extending from a side of the mask body opposite to the subject animal along the first direction and having a guide hole disposed through in the first direction and communicating with the mouth-nose receiving cavity, The tooth retractor comprises: a tooth hook for hooking the tooth of the subject animal within the mouth-nose receiving cavity; a pull rod inserted into the guide hole and connected to the tooth hook; wherein the pull rod is configured to be movable relative to the guide hole along the first direction and retainable at a plurality of positions along the first direction.

5. The holder of claim 4, wherein Further comprising: a jackscrew threadedly engaged with the extension and extending in a direction crossing the first direction; the jackscrew being configured to selectively abut to and depart from a side surface of the pull rod by rotating the jackscrew.

6. The holder of claim 4, wherein Further comprising: a clamping assembly operable to have a clamping state and a release state; in the clamping state, the clamping assembly clamps the extension to thereby prevent the mask from moving along the first direction; in the release state, the clamping assembly releases the extension to thereby allow the mask to move along the first direction; the clamping assembly comprises: a first clamping member connected to the carrier and having a first clamping groove; a second clamping member having a second clamping groove opposite to the first clamping groove to thereby define a clamping passage extending along the first direction; wherein the extension is inserted into the clamping passage; a first screw connecting the second clamping member to the first clamping member and capable of selectively bringing the clamping assembly into the clamping state and the release state by rotating operation of the first screw.

7. The anchor of any one of claims 1 to 6, wherein, Further comprising: Two ear bars are mounted to the carrier and are configured to abut inwardly to both ears of the subject animal along a second direction that intersects the first direction, thereby restricting head movement of the subject animal.

8. An MRI coil apparatus, characterized by Comprising: a housing; the holder of any one of claims 1 to 7 is detachably mounted to the housing; a radio frequency coil is mounted within the housing for receiving magnetic resonance signals from the subject animal.

9. The MRI coil device of claim 8, wherein, the housing defines a bore that extends through in the first direction and a coil mounting cavity that is located on a peripheral side of the bore, the radio frequency coil is mounted in the coil mounting cavity, the holder is disposed through the bore, and a mounting position of the holder relative to the housing is adjustable along the first direction.

10. The MRI coil device of claim 9, wherein, the carrier includes a first section and a second section that are located on opposite sides of the bore along the first direction, the first section has a first elongated hole that extends along the first direction, and the second section has a second elongated hole that extends along the first direction; the holder is detachably mounted to the housing via a third screw and a fourth screw, wherein the third screw is threaded through the first elongated hole and is screwed with the housing, and the fourth screw is threaded through the second elongated hole and is screwed with the housing.

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