阅读说明：本技术 机架结构及多模态医学成像系统 (Rack construction and multi-modal medical imaging system ) 是由 徐烽 于 2020-05-26 设计创作，主要内容包括：本发明提供一种机架结构及多模态医学成像系统。该机架结构包括第一支撑筒体,用于安装体发射线圈；第二支撑筒体,套设于所述第一支撑筒体的外侧,用于安装PET探测器,所述第二支撑筒体的两端凸出于所述第一支撑筒体的两端,且所述第二支撑筒体的端部与多模态医学成像系统的磁体连接；以及多个支撑机构,位于所述第一支撑筒体的端部,并可运动至所述第一支撑筒体与所述第二支撑筒体之间,所述支撑机构可向所述第一支撑筒体提供径向支撑力,以将所述第一支撑筒体支离所述第二支撑筒体。机架结构通过第二支撑筒体的端部与磁体连接即可实现装配,降低机架结构的复杂程度,便于维护。同时,可以减轻机架结构的重量,降低制造成本。(The invention provides a frame structure and a multi-modal medical imaging system. The frame structure comprises a first support cylinder for mounting a body transmitting coil; the second support cylinder is sleeved on the outer side of the first support cylinder and used for mounting a PET (positron emission tomography) detector, two ends of the second support cylinder protrude out of two ends of the first support cylinder, and the end part of the second support cylinder is connected with a magnet of the multi-modal medical imaging system; and a plurality of support mechanisms located at an end of the first support cylinder and movable between the first support cylinder and the second support cylinder, the support mechanisms providing a radial support force to the first support cylinder to support the first support cylinder away from the second support cylinder. The rack structure can be assembled by connecting the end part of the second support cylinder with the magnet, so that the complexity of the rack structure is reduced, and the maintenance is facilitated. Meanwhile, the weight of the frame structure can be reduced, and the manufacturing cost is reduced.)

1. A frame structure, comprising:

a first support cylinder for mounting a body transmitter coil;

the second support cylinder is sleeved on the outer side of the first support cylinder and used for mounting a PET (positron emission tomography) detector, two ends of the second support cylinder protrude out of two ends of the first support cylinder, and the end part of the second support cylinder is connected with a magnet of the multi-modal medical imaging system; and

and the supporting mechanisms are positioned at the end part of the first supporting cylinder body and can move between the first supporting cylinder body and the second supporting cylinder body, and can provide radial supporting force for the first supporting cylinder body so as to support the first supporting cylinder body away from the second supporting cylinder body.

2. The frame structure according to claim 1, characterized in that the support mechanism comprises a support which is movable between the first support cylinder and the second support cylinder and which can be brought into abutment with the first support cylinder.

3. The frame structure according to claim 2, wherein at least a portion of the support member is disposed obliquely, and the support member is capable of extending between the first support cylinder and the second support cylinder, abutting against an outer wall of the first support cylinder, and providing a radial support force for the first support cylinder.

4. The frame structure of claim 3, wherein the support mechanism further comprises an adjustment assembly disposed on an inner wall of the second support cylinder and connected to the support member for driving the support member to move in the axial direction.

5. The frame structure according to claim 4, wherein the adjustment assembly comprises an adjustment base and a linear motion member movably disposed on the adjustment base, an output end of the linear motion member being connected to the support member.

6. The frame structure according to claim 2, wherein the support member penetrates the second support cylinder in the radial direction and abuts the first support cylinder, the support member being movable in the radial direction and providing a radial support force for the first support cylinder.

7. The frame structure according to any one of claims 1 to 6, wherein each end of the first support cylinder has at least two of the support mechanisms, the at least two support mechanisms being spaced apart circumferentially of the first support cylinder.

8. The frame structure according to any one of claims 1 to 6, further comprising a limiting mechanism disposed on an inner wall of the second support cylinder for limiting axial displacement of the first support cylinder.

9. The frame structure according to any one of claims 1 to 5, further comprising a connection mechanism provided at an end of the second support cylinder for connection with a magnet of a multi-modality medical imaging system.

10. A multi-modality medical imaging system comprising a PET detector, a body transmit coil, and a gantry structure; the rack structure includes:

a first support cylinder for mounting a body transmitter coil;

the second supporting cylinder is sleeved on the outer side of the first supporting cylinder and used for mounting the PET detector; and

and the supporting mechanisms are positioned at the end part of the first supporting cylinder body and can move between the first supporting cylinder body and the second supporting cylinder body, and can provide radial supporting force for the first supporting cylinder body so as to support the first supporting cylinder body away from the second supporting cylinder body.

Technical Field

The invention relates to the technical field of medical imaging equipment, in particular to a frame structure and a multi-modal medical imaging system.

Background

The PET/MR device is structured to add a PET (Positron Emission Computed Tomography) detector to the MR system. PET detectors are typically wrapped around the patient being scanned when imaging. Therefore, a separate support is required to be manufactured for the support, and a cylindrical support cylinder is generally manufactured for the support. In the current MR system, there is originally a layer of cylinder for supporting a Volume Transmit Coil (also called Volume Transmit Coil, VTC), and adding a PET detector to the above cylinder structure generally increases the periphery of the Volume Transmit Coil, that is, the system structure is changed from the original single-layer cylinder structure to a double-layer cylinder structure. The support cylinder is generally fixed on the end face of the magnet, so that the support cylinder is prevented from contacting with the gradient coil, and the vibration of the gradient coil during working can influence the PET imaging and the S parameter of the VTC. However, after the two layers of cylinders are adopted, a fixing structure is required to be added on the end face of the magnet, and the fixing structure has a large requirement on space, so that the problems of large structure, large maintenance difficulty and the like are caused.

Disclosure of Invention

Therefore, it is necessary to provide a rack structure and a multi-modality medical imaging system with reduced structural complexity for solving the problems of bulkiness and high maintenance difficulty caused by the adoption of a double-layer barrel at present.

The above purpose is realized by the following technical scheme:

a gantry structure of a multi-modality medical imaging system, comprising:

a first support cylinder for mounting a body transmitter coil;

the second support cylinder is sleeved on the outer side of the first support cylinder and used for mounting a PET (positron emission tomography) detector, two ends of the second support cylinder protrude out of two ends of the first support cylinder, and the end part of the second support cylinder is connected with a magnet of the multi-modal medical imaging system; and

and the supporting mechanisms are positioned at the end part of the first supporting cylinder body and can move between the first supporting cylinder body and the second supporting cylinder body, and can provide radial supporting force for the first supporting cylinder body so as to support the first supporting cylinder body away from the second supporting cylinder body.

In one embodiment, the support mechanism includes a support that is movable between the first support cylinder and the second support cylinder and is abuttable with the first support cylinder.

In one embodiment, at least part of the supporting part is obliquely arranged, and the supporting part can extend into the space between the first supporting cylinder and the second supporting cylinder, is abutted against the outer wall of the first supporting cylinder and provides radial supporting force for the first supporting cylinder.

In one embodiment, the supporting mechanism further comprises an adjusting assembly, and the adjusting assembly is arranged on the inner wall of the second supporting cylinder, is connected with the supporting piece and is used for driving the supporting piece to move along the axial direction.

In one embodiment, the adjusting assembly comprises an adjusting seat and a linear moving part movably arranged on the adjusting seat, and an output end of the linear moving part is connected with the supporting part.

In one embodiment, the support member penetrates through the second support cylinder body in the radial direction and abuts against the first support cylinder body, and the support member can move in the radial direction and provides radial support force for the first support cylinder body.

In one embodiment, each end of the first support cylinder is provided with at least two support mechanisms, and the at least two support mechanisms are arranged at intervals along the circumferential direction of the first support cylinder.

In one embodiment, the rack structure further comprises a limiting mechanism, and the limiting mechanism is arranged on the inner wall of the second support cylinder and used for limiting the axial displacement of the first support cylinder.

In one embodiment, the limiting mechanism comprises a limiting block and a fixing piece for fixing the limiting block, and the fixing piece fixes the limiting block to the second support cylinder;

the size of the limiting block in the radial direction is larger than the distance between the outer wall of the first supporting cylinder and the inner wall of the second supporting cylinder.

In one embodiment, the frame structure further comprises a connecting mechanism disposed at an end of the second support cylinder for connecting with a magnet of a multi-modality medical imaging system.

A multi-modality medical imaging system, comprising a PET detector, a body transmit coil, and a gantry structure; the rack structure includes:

a first support cylinder for mounting a body transmitter coil;

the second supporting cylinder is sleeved on the outer side of the first supporting cylinder and used for mounting the PET detector; and

and the supporting mechanisms are positioned at the end part of the first supporting cylinder body and can move between the first supporting cylinder body and the second supporting cylinder body, and can provide radial supporting force for the first supporting cylinder body so as to support the first supporting cylinder body away from the second supporting cylinder body.

After the technical scheme is adopted, the invention at least has the following technical effects:

according to the frame structure of the multi-modal medical imaging system and the multi-modal medical imaging system, the first supporting cylinder is arranged on the inner wall of the second supporting cylinder. And, install the body transmitting coil on the first support barrel, install the PET detector on the second support barrel, be fixed in the inner wall of second support barrel with first support barrel through supporting mechanism, supporting mechanism provides radial holding power to prop first support barrel from the second support barrel, adjusts the radial position of first support barrel, makes the axis collineation of first support barrel and second support barrel, and guarantees that first support barrel is reliable to be fixed in the inside of second support barrel. Therefore, the rack structure can be assembled by connecting the end part of the second support cylinder with the magnet of the multi-modal medical imaging system, the problems of large structure and high maintenance difficulty caused by the adoption of a double-layer cylinder at present are effectively solved, the complexity of the rack structure is reduced, and the maintenance is facilitated. Meanwhile, the axial length of the second support cylinder is larger than that of the first support cylinder, and after the rack structure is connected with the magnet through the second support cylinder, the weight of the rack structure can be reduced, and the manufacturing cost is reduced.

Drawings

FIG. 1 is a front view of a frame structure with attached magnets, etc. in accordance with one embodiment of the present invention;

FIG. 2 is a perspective view of the gantry structure of FIG. 1 with PET detectors mounted thereon;

FIG. 3 is a front view of the gantry structure of FIG. 2 with PET detectors mounted thereon;

FIG. 4 is a perspective view of the support mechanism in the frame structure shown in FIG. 2;

FIG. 5 is a schematic view of a first support cylinder of the rack structure shown in FIG. 1;

FIG. 6 is a schematic view of a second support cylinder of the frame structure of FIG. 1;

FIG. 7 is a schematic structural view of the second support cylinder mounted PET detectors shown in FIG. 6;

FIGURE 8 is an exploded view of the second support cylinder mounted PET detector shown in FIGURE 7.

Wherein: 100. a frame structure; 110. a first support cylinder; 111-a limiting groove; 112. a positioning part; 1121. a first positioning portion; 1122. a second positioning portion; 120. a second support cylinder; 121. a fixing member; 122. an air inlet pipeline; 123. a shielding layer; 130. a support mechanism; 131. a support member; 132. an adjustment assembly; 1321. an adjusting seat; 1322. a linear motion member; 140. a limiting mechanism; 300. a PET detector; 400. a magnet; 500. a gradient coil.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1-3, the present invention provides a gantry structure 100 for a multi-modality medical imaging system. The gantry structure 100 is applied in a multi-modality medical imaging system, such as a mixed modality medical device like a PET/MR magnetic resonance imaging device. Before PET imaging is performed, an isotope label (imaging agent) having positron emission is injected into an imaging subject, and then scanning is performed. Signals from isotopic markers, such as gamma rays, can be received by the PET detector 300 on the gantry structure 100 and positional information of photons generated by the received gamma rays on the detector is fed back to the multi-modality medical imaging system for imaging the predetermined scan region. The gantry structure 100 of the present invention has a simple structure, is convenient to connect with the magnet 400 of the multi-modality medical imaging system, and is convenient to maintain, and meanwhile, the gantry structure 100 has a light weight, and can reduce the production cost.

In one embodiment, the rack structure 100 includes a first support cylinder 110, a second support cylinder 120, and a plurality of support mechanisms 130. The first support cylinder 110 is used to mount/fix the body transmit coil. The second supporting cylinder 120 is sleeved outside the first supporting cylinder 110 for mounting the PET detector 300, two ends of the second supporting cylinder 120 protrude from two ends of the first supporting cylinder 110, and an end of the second supporting cylinder 120 is connected to the magnet 400 of the multi-modality medical imaging system. The plurality of support mechanisms 130 are located at an end of the first support cylinder 110 and are movable between the first support cylinder 110 and the second support cylinder 120, and the support mechanisms 130 may provide a radial support force to the first support cylinder 110 to support the first support cylinder 110 from the second support cylinder 120.

The first support cylinder 110 and the second support cylinder 120 are hollow and cylindrical. The first support cylinder 110 is installed in the second support cylinder 120 in the axial direction. The second support cylinder 120 plays a supporting role, and the second support cylinder 120 can support the first support cylinder 110 therein, so that the first support cylinder 110 is reliably fixed in the second support cylinder 120; meanwhile, the outer wall of the second support cylinder 120 is also provided with a PET detector 300, and the PET detector 300 can receive gamma rays during imaging. The first support cylinder 110 also serves as a support for mounting the body transmitter coil. Radio frequency signals required for imaging are excited by the body transmitting coil.

It can be understood that due to manufacturing, installation, and other errors, a gap exists between the first support cylinder 110 and the second support cylinder 120, and the gap makes the axis of the first support cylinder 110 and the axis of the second support cylinder 120 not collinear, which may affect the detection effect of the multi-modality medical imaging system. Accordingly, the rack structure 100 of the present invention provides the support mechanism 130 between the first support cylinder 110 and the second support cylinder 120. The radial position of the first support cylinder 110 relative to the second support cylinder 120 can be adjusted by the support mechanism 130 such that the axis of the first support cylinder 110 is collinear with the axis of the second support cylinder 120.

Specifically, after the first support cylinder 110 is placed at the designated position of the second support cylinder 120, the support mechanism 130 may move between the first support cylinder 110 and the second support cylinder 120, and the support mechanism 130 gradually abuts against the outer wall of the first support cylinder 110. At this time, the support mechanism 130 may provide a radial support force to the first support cylinder 110. The radial supporting force may drive the first supporting cylinder 110 to move in a radial direction to support the first supporting cylinder 110 from the second supporting cylinder 120, so as to adjust the radial position of the first supporting cylinder 110, such that the axis of the first supporting cylinder 110 is collinear with the axis of the second supporting cylinder 120. When the axis of the first support cylinder 110 is collinear with the axis of the second support cylinder 120, the support mechanism 130 stops moving. It is understood that the supporting mechanism 130 can be actively moved, such as by a power source such as a motor; of course, the support mechanism 130 may also be moved passively, i.e., by an operator manually adjusting the position of the support mechanism 130. This is described in detail later.

Moreover, the supporting mechanisms 130 are respectively located at two ends of the first supporting cylinder 110, and the supporting mechanisms 130 at two ends of the first supporting cylinder 110 respectively support two ends of the first supporting cylinder 110 away from the second supporting cylinder 120, so that the axes at two ends of the first supporting cylinder 110 can be collinear with the axis of the second supporting cylinder 120, the situation that one end of the first supporting cylinder 110 is collinear and the other end of the first supporting cylinder is not collinear is avoided, the installation accuracy of the frame structure 100 is ensured, and the imaging quality of the multi-modal medical imaging system is further ensured. Meanwhile, the supporting mechanisms 130 at the two ends of the first supporting cylinder 110 can also realize axial fixation of the first supporting cylinder 110, so that the first supporting cylinder 110 is reliably fixed in the second supporting cylinder 120 without axial movement.

Also, both ends of the second support cylinder 120 protrude from both ends of the first support cylinder 110. That is, the axial length of the second support cylinder 120 is greater than the axial length of the first support cylinder 110. At this time, the installation requirement can be satisfied by connecting the two ends of the second support cylinder 120 to the magnet 400 of the multi-modal medical imaging system, and the first support cylinder 110 and the second support cylinder 120 are not required to be connected to the magnet 400 of the multi-modal medical imaging system, thereby reducing the complexity of the rack structure 100.

The rack structure 100 of the present invention fixes the first support cylinder 110 to the inner wall of the second support cylinder 120 through the support mechanism 130, and the support mechanism 130 provides a radial support force to support the first support cylinder 110 away from the second support cylinder 120 and adjusts the radial position of the first support cylinder 110 so that the axis of the first support cylinder 110 is collinear with the axis of the second support cylinder 120 and ensures that the first support cylinder 110 is reliably fixed inside the second support cylinder 120. In this way, the rack structure 100 can be assembled by connecting the end of the second support cylinder 120 with the magnet 400 of the multi-modality medical imaging system, so that the problems of the current double-layer cylinder that the structure is too bulky and the maintenance difficulty is large are effectively solved, the complexity of the rack structure 100 is reduced, and the maintenance is facilitated. Meanwhile, the axial length of the second support cylinder 120 is greater than the axial length of the first support cylinder 110, and after the rack structure 100 is connected to the magnet 400 through the second support cylinder 120, the weight of the rack structure 100 can be reduced, and the manufacturing cost can be reduced.

In one embodiment, the first support cylinder 110 has at least two support mechanisms 130 at each end, and the at least two support mechanisms 130 are spaced apart along the circumference of the first support cylinder 110. The at least two support mechanisms 130 at one end of the first support cylinder 110 can realize radial displacement of the first support cylinder 110 in at least two directions, and ensure reliable radial position of the first support cylinder 110. Further, each end of the first support cylinder 110 has three, four, or even more support mechanisms 130.

Alternatively, the plurality of support mechanisms 130 are uniformly distributed along the circumferential direction of the first support cylinder 110. Therefore, the radial supporting force on the first supporting cylinder 110 can be ensured to be uniform, the radial position of the first supporting cylinder 110 can be adjusted conveniently, and the axis of the first supporting cylinder 110 and the axis of the second supporting cylinder 120 can be collinear easily. Of course, in other embodiments of the present invention, the plurality of supporting mechanisms 130 may also be non-uniformly distributed along the circumferential direction of the first supporting cylinder 110. It can be understood that, as long as the support mechanisms 130 are not close to each other, the radial adjustment of the first support cylinder 110 can be supported, so that the adjusted position of the first support cylinder 110 does not generate radial play. Illustratively, each end of the first support cylinder 110 has four support mechanisms 130, and the four support mechanisms 130 are evenly distributed along the end of the first support cylinder 110.

Optionally, each end of the first support cylinder 110 includes a first support mechanism, a second support mechanism and a third support mechanism arranged at intervals. The first supporting mechanism and the second supporting mechanism are arranged adjacently, and the circumferential radian of the first supporting cylinder 110 between the first supporting mechanism and the second supporting mechanism is larger than or equal to 60 degrees. Or the first support mechanism and the third support mechanism are arranged adjacently, and the circumferential radian of the first support cylinder 110 between the first support mechanism and the third support mechanism is greater than or equal to 60 degrees. The second supporting mechanism and the third supporting mechanism are arranged adjacently, and the circumferential radian of the first supporting cylinder body corresponding to the second supporting mechanism and the third supporting mechanism is larger than or equal to 60 degrees. This arrangement ensures that the first support cylinder 110 is securely fixed to the second support cylinder 120.

In one embodiment, the first support mechanism, the second support mechanism and the third support mechanism are arranged at equal intervals along the axial direction of the first support cylinder 110 clockwise or counterclockwise, that is, the circumferential radian of the first support cylinder 110 between the first support mechanism and the second support mechanism is 120 degrees, the circumferential radian of the first support cylinder 110 between the second support mechanism and the third support mechanism is 120 degrees, and the circumferential radian of the first support cylinder 110 between the first support mechanism and the third support mechanism is 120 degrees. So the symmetrical arrangement, the three support structures make the second support cylinder 120 exert even supporting force on the first support cylinder 110, and can ensure that the first support cylinder 110 is firmly fixed on the second support cylinder 120.

In one embodiment, the circumferential arc of the first support cylinder 110 between the first support mechanism and the second support mechanism is 60 degrees, the circumferential arc of the first support cylinder 110 between the second support mechanism and the third support mechanism, and the circumferential arc of the first support cylinder 110 between the first support mechanism and the third support mechanism are greater than 120 degrees, for example, 150 degrees. With this arrangement, the first supporting mechanism and the second supporting mechanism are disposed at the lower half portion of the second supporting cylinder 120, and the third supporting mechanism is disposed at the upper half portion of the second supporting cylinder 120, so that the second supporting cylinder 120 can apply supporting force to the first supporting cylinder in the front-back, left-right, and vertical directions, thereby ensuring that the first supporting cylinder 110 is firmly fixed to the second supporting cylinder 120.

Referring to fig. 1 to 4, in an embodiment, the supporting mechanism 130 includes a supporter 131, and the supporter 131 is movable between the first and second support cylinders 110 and 120 and may abut against the first support cylinder 110. The support 131 provides a radial support force to the first support cylinder 110 to adjust the radial position of the first support cylinder 110.

When adjusted, the support 131 may move between the first support cylinder 110 and the second support cylinder 120 and gradually approach the outer wall of the first support cylinder 110. When the supporter 131 abuts against the outer wall of the first support cylinder 110, the supporter 131 provides the first support cylinder 110 with a radial support force in a radial direction, and the radial support force is directed toward the center of the first support cylinder 110. The radial support force may drive the first support cylinder 110 to move in a radial direction such that the first support cylinder 110 is away from the second support cylinder 120. The radial position of the first support cylinder 110 can be adjusted in the process of the movement of the first support cylinder 110, so that the axial positions of the first support cylinder 110 and the second support cylinder 120 can be adjusted, and the axial line of the first support cylinder 110 is collinear with the axial line of the second support cylinder 120.

In an embodiment, the supporting member 131 is at least partially disposed in an inclined manner, and the supporting member 131 may extend between the first supporting cylinder 110 and the second supporting cylinder 120, abut against the outer wall of the first supporting cylinder 110, and provide a radial supporting force for the first supporting cylinder 110. That is, the supporting member 131 is a supporting block, one surface of which is an inclined surface and the other surface is a flat surface. The supporting member 131 has a first end and a second end, the radial dimension of the first end is smaller than that of the second end, and the radial dimension of the supporting member 131 gradually increases from the first end to the second end. The supporter 131 is disposed on an inner wall of the second support cylinder 120 and is movable along the inner wall of the second support cylinder 120.

When the radial position of the first supporting cylinder 110 is adjusted by the supporting member 131, the first end of the supporting member 131 gradually extends between the first supporting cylinder 110 and the second supporting cylinder 120. Due to the small radial dimension of the first end of the supporting member 131, when the supporting member 131 just extends between the first supporting cylinder 110 and the second supporting cylinder 120, a certain distance exists between the supporting member 131 and the outer wall of the first supporting cylinder 110. When the supporter 131 continues to move in the axial direction, the supporter 131 may abut against the outer wall of the first support cylinder 110. Since the supporting member 131 is installed on the inner wall of the second supporting cylinder 120, at this time, the inclined surface of the supporting member 131 provides an inclined acting force to the first supporting cylinder 110, the inclined acting force can be decomposed into a radial supporting force and an axial force, and the radial supporting force acts on the first supporting cylinder 110 and then can drive the first supporting cylinder 110 to move in the radial direction, so that the outer wall of the first supporting cylinder 110 is far away from the inner wall of the second supporting cylinder 120, the purpose of adjusting the radial position of the first supporting cylinder 110 is achieved, and the adjustment of the axial position of the first supporting cylinder 110 is achieved, so that the axial line of the first supporting cylinder 110 can be collinear with the axial line of the second supporting cylinder 120.

Alternatively, a sealing member may be disposed between the first support cylinder 110 and the second support cylinder 120. In this embodiment, a sealing strip is disposed between the first supporting cylinder 110 and the second supporting cylinder 120, and the sealing strip is matched with the supporting member 131, so that a sealed space is formed between the first supporting cylinder 110 and the second supporting cylinder 120, and the sealed space is vacuumized, so that noise generated by the second supporting cylinder 120 due to the influence of the vibration of the magnet can be reduced and transmitted to the first supporting cylinder 110 (the proximal end of the patient), and further mechanical vibration noise of the multi-modality medical imaging system can be reduced.

In an embodiment, the supporting mechanism 130 further includes an adjusting assembly 132, and the adjusting assembly 132 is disposed on an inner wall of the second supporting cylinder 120 and connected to the supporting member 131 for driving the supporting member 131 to move in the axial direction. The adjusting assembly 132 is connected to the second end of the supporting member 131, and the adjusting assembly 132 can move along the output axis to drive the supporting member 131 to move in the axial direction, so that the supporting member 131 extends between the first supporting cylinder 110 and the second supporting cylinder 120.

In one embodiment, the adjusting assembly 132 includes an adjusting seat 1321 and a linear motion member 1322 movably disposed on the adjusting seat 1321, wherein an output end of the linear motion member 1322 is connected to the supporting member 131. The adjusting seat 1321 is used for bearing and fixing, and the adjusting seat 1321 is used for bearing and installing the linear motion member 1322 and is fixedly installed on the inner wall of the second support cylinder 120, so that the position of the adjusting assembly 132 in the second support cylinder 120 is fixed. When the linear motion member 1322 outputs a linear motion, since the adjustment seat 1321 is fixed to the second support cylinder 120, the linear motion output by the linear motion member 1322 can drive the support member 131 to move, so that the support member 131 extends into or moves out of the space between the first support cylinder 110 and the second support cylinder 120. Alternatively, the adjustment seat 1321 may be fixed to the inner wall of the second support cylinder 120 by means of screws or gluing, etc.

Illustratively, the linear motion member 1322 may be a ball screw structure. When the linear motion member 1322 rotates in a direction, the linear motion member 1322 may push the supporting member 131 to move toward the first supporting cylinder 110 and may extend between the first supporting cylinder 110 and the second supporting cylinder 120. When the linear motion member 1322 rotates in the other direction, the linear motion member 1322 may pull the supporting member 131 to move away from the first supporting cylinder 110, and may move out from between the first supporting cylinder 110 and the second supporting cylinder 120. The first direction and the second direction are clockwise direction and counterclockwise direction. Of course, in other embodiments of the present invention, the linear motion member 1322 may be a telescopic rod, a slide rail and slider structure, or another structure capable of outputting linear motion.

Optionally, the adjusting assembly 132 further comprises a motor, which is connected to the linear motion member 1322, and drives the linear motion member 1322 to move by the motor so as to output the linear motion. Of course, in other embodiments of the present invention, the end of the linear motion member 1322 may be further connected to a detachable wrench, and the linear motion member 1322 may be driven to move by the detachable wrench to adjust the radial position of the first support cylinder 110.

Of course, the inclined support 131 may be replaced by a cam, and the radial support force may be provided by the rotation of the cam.

In an embodiment, the supporting member 131 penetrates through the second supporting cylinder 120 in the radial direction and abuts against the first supporting cylinder 110, and the supporting member 131 can move in the radial direction and provide a radial supporting force for the first supporting cylinder 110. That is, the support 131 may be a jacking member. Alternatively, the support 131 is a screw or a telescopic rod, etc. One end of the supporting member 131 penetrates the second supporting cylinder 120 to extend between the first supporting cylinder 110 and the second supporting cylinder 120, and abuts against the outer wall of the first supporting cylinder 110.

In an embodiment, the frame structure 100 further includes a limiting mechanism 140, and the limiting mechanism 140 is disposed on an inner wall of the second support cylinder 120 and located at an end of the first support cylinder 110, for limiting an axial displacement of the first support cylinder 110. The limiting mechanisms 140 are disposed at two axial ends of the first supporting cylinder 110, and can limit the axial displacement of the first supporting cylinder 110. The limiting mechanism 140 is detachably mounted on the inner wall of the second support cylinder 120. It can be understood that, when the first support cylinder 110 is installed on the second support cylinder 120, the first support cylinder 110 is installed at a designated position in the second support cylinder 120, and then the limiting mechanisms 140 are installed at the two axial ends of the first support cylinder 110, so that the axial displacement of the first support cylinder 110 is limited by the limiting mechanisms 140, and the first support cylinder 110 does not move along the axial direction. Subsequently, the radial position of the first support cylinder 110 with respect to the second support cylinder 120 is adjusted by the support mechanism 130 so that the axis of the first support cylinder 110 coincides with the axis of the second support cylinder 120.

After the supporting mechanism 130 supports the first supporting cylinder 110, the position of the first supporting cylinder 110 relative to the second supporting cylinder 120 is fixed, the first supporting cylinder 110 can also limit the axial displacement thereof through the supporting mechanism 130, and at this time, the limiting mechanism 140 can be removed. That is, the limiting mechanism 140 only serves as an axial limiting function before the support mechanism 130 is installed, and the limiting mechanism 140 may not be provided thereafter.

In one embodiment, the limiting mechanism 140 includes a limiting block and a fixing member for fixing the limiting block, and the fixing member fixes the limiting block to the second supporting cylinder 120. The limiting block plays a role in stopping and can be abutted against the end part of the first support cylinder 110 to limit the axial displacement of the first support cylinder 110. The fixing member is used for realizing that the limiting block is detachably mounted on the inner wall of the second support cylinder 120. Alternatively, the securing member is a threaded member or other member that enables a detachable connection. Alternatively, the stop block may be replaced by other components capable of functioning as a stop, such as a separate threaded member, a stop pin, or the like.

In one embodiment, the stopper has a dimension in the radial direction that is greater than the distance between the outer wall of the first support cylinder 110 and the inner wall of the second support cylinder 120. That is to say, the limiting block has a certain length along the radial direction, and thus, after the limiting block is installed on the inner wall of the second support cylinder 120, the limiting block can be ensured to be at least partially abutted against the end of the first support cylinder 110, so as to achieve the purpose of limiting the axial displacement of the first support cylinder 110.

In an embodiment, the gantry structure 100 further includes a connection mechanism disposed at an end of the second support cylinder 120 for connecting with the magnet 400 of the multi-modality medical imaging system. The connection mechanism establishes a connection between the frame structure 100 and the magnet 400. Further, the connection mechanism includes a screw locking member by which the second support cylinder 120 and the magnet 400 are connected, so that the connection between the second support cylinder 120 and the magnet 400 is reliable.

In the present invention, the first support cylinder 110 is reliably supported in the second support cylinder 120 by the support mechanism 130, and the position of the first support cylinder 110 relative to the second support cylinder 120 is adjusted to ensure that the axis of the first support cylinder 110 coincides with the axis of the second support cylinder 120. Furthermore, the gantry structure 100 can be coupled to the magnet 400 of the multi-modality medical imaging system through the second support cylinder 120 without the first support cylinder 110 also being coupled to the magnet 400. Therefore, the number of connecting mechanisms of the frame structure 100 and the magnet 400 can be reduced, the complexity of connecting the frame structure 100 and the magnet 400 is reduced, the structure is prevented from being overstaffed, and the later maintenance is facilitated. In addition, the length of the first support cylinder 110 can be shortened, the weight of the rack structure 100 can be reduced, and the production cost of the rack structure 100 can be reduced.

Please refer to fig. 5, which is a schematic structural diagram of the first support cylinder 110 of the present application. The first support cylinder 110 extends in an axial direction, may be set to have an axial length of any value between 60 and 150cm, and has an inner surface and an outer surface at the first support cylinder 110. The outer surface of the end of the first support cylinder 110 is provided with one or more limiting grooves 111, and the limiting grooves 111 may be engaged with portions of the support 131 to limit the circumferential position of the support 131. In this embodiment, the surface of the limiting groove 111 can match with the inclined surface of the supporting member 131.

Referring to fig. 5, a plurality of positioning portions 112 are formed on the outer surface of the first supporting cylinder 110, and the positioning portions 112 can be formed by forming slots on the outer surface of the rf coil. In this embodiment, the first support cylinder 110 is made of glass fiber reinforced plastic material capable of withstanding high voltage breakdown, and has a thickness of about 20-30mm, and the outer surface of the first support cylinder 110 is grooved to form a groove having a thickness of about 5-15 mm. As shown in fig. 5, the positioning portion 112 includes a first positioning portion 1121 and a second positioning portion 1122 which are orthogonal to each other, two first positioning portions 1121 are disposed to surround the circumference of the first support cylinder 110 and are disposed to be opposite to each other, several second positioning portions 1122 extend in the axial direction of the first support cylinder 110, and the first positioning portion 1121 and the second positioning portions 1122 may be disposed to communicate with each other. The positioning portion 112 may be provided with a conductor or an electrical device, specifically: an end ring (a discontinuous circle in the figure) is oppositely arranged in the first positioning portion 1121, and the end ring can be composed of a discontinuous insulating copper sheet or a discontinuous conducting wire; a plurality of legs (parallel portions in the horizontal direction in the figure) disposed in the second positioning portion 1122, the legs are made of conductive wires or copper sheets insulated from each other and covered with a PCB, and the legs connect edges of two end rings disposed opposite to each other without overlapping with each other, so that the end rings and the legs jointly form a body transmitting coil.

Please refer to fig. 6, which is a schematic structural diagram of the second support cylinder 120 of the present application. The second support cylinder 120 extends along the axial direction, and may be set to an axial length of any value between 100 and 200cm, and the axial length of the second support cylinder 120 is greater than the axial length of the first support cylinder 110. The second support cylinder 120 includes an inner surface and an outer surface.

The second support cylinder 120 is provided with a plurality of fixing members 121 juxtaposed in the axial direction, the fixing members 121 forming a receiving cavity with an upper end open, and the PET detector 300 being detachably disposed in the receiving cavity of the fixing members 121, as shown in fig. 7 and 8. In this embodiment, a plurality of fixing pieces 121 are provided along the circumferential direction of the second support cylinder 120, one PET detector being provided in each fixing piece 121, thereby forming a PET detector ring.

Referring to fig. 7 and 8, a through hole may be formed at one end or both ends of the fixing member 121, and the air inlet duct 122 and the air outlet duct are connected through the through hole. One end of each fixing member 121 is provided with a through hole, the through hole is connected with an air inlet pipe 122, the air inlet pipes 122 are simultaneously connected with an annular cavity formed in the surface of the second support cylinder 120, and an external air cooling device is connected with the annular cavity so as to send air flow with lower temperature to the PET detector 300. Of course, the other end of each fixing member 121 may be provided with an air outlet pipe to form a complete cooling circuit.

The inner surface of the second support cylinder 120 facing the first support cylinder 110 is provided with a shield layer 123. As shown in fig. 6, the shielding layer 123 is wrapped around the inner surface of the second support cylinder 120 and has a cylindrical shape. By arranging the external shielding layer 123, the radio frequency induced current of the conductor material in the PET detector 300 can be reduced, and the interference of radio frequency to the PET detector 300 can be reduced. The outer surface of the shielding layer 123 of the present invention is provided with a plurality of slits parallel to the axial direction, the slits have a break along the axial direction, and the width of the slits is generally about 1-5 mm. In this embodiment, since the length of the first support cylinder 110 in the axial direction is smaller than the length of the second support cylinder 120 in the axial direction, the body radiator coil fixed to the first support cylinder 110 can also be set to a short size, and the length of the shield layer 123 corresponding to the body radiator coil in the axial direction is also smaller than the length of the second support cylinder 120 in the axial direction, so that it is not necessary to provide a shield layer to completely cover the inner side surface of the second support cylinder 120 as in the prior art.

Referring to fig. 1, the present invention also provides a multi-modality medical imaging system including a PET detector 300, a body transmit coil, and a gantry structure 100. The rack structure 100 includes a first support cylinder 110, a second support cylinder 120, and a plurality of support mechanisms 130. The first support cylinder 110 is used to mount the body transmit coil. The second supporting cylinder 120 is sleeved outside the first supporting cylinder 110 for mounting the PET detector 300. The plurality of support mechanisms 130 are located at an end of the first support cylinder 110 and are movable between the first support cylinder 110 and the second support cylinder 120, and the support mechanisms 130 may provide a radial support force to the first support cylinder 110 to support the first support cylinder 110 from the second support cylinder 120.

The body transmit coil is used to excite the radio frequency signal. When the multi-modal medical imaging system is used for imaging, the multi-modal medical imaging system can generate radio frequency pulses, and the radio frequency pulses are amplified and then emitted by the body part emitting coil to carry out radio frequency excitation on an imaging object. The imaging subject generates corresponding radio frequency signals according to the radio frequency excitation, and the radio frequency signals can be received by the PET detector 300 on the body emission coil and further transmitted to the image imaging unit of the multi-modality medical imaging system for image reconstruction to form an image of the imaging subject on the predetermined scanning area.

Furthermore, the multi-modality medical imaging system further includes a scan cylinder, and a magnet 400, a gradient coil 500, and the like disposed in the scan cylinder. The gantry structure 100 is mounted in the scan tube and is coupled to the magnet 400. The magnet 400 is used to generate a uniform steady main magnetic field for magnetizing the imaged object to produce a macroscopic magnetization vector. The gradient coil 500 may generate a spatially linear gradient magnetic field such that the resonance frequency of the imaging subject at different spatial locations is different, thereby allowing signals at different spatial locations to be distinguished. Also, the multi-modality medical imaging system of the present invention is a PET/MR system, and the gantry structure 100 further mounts the body transmit coils and the PET detectors 300 required for the multi-modality medical imaging system. The rack structure 100 is the rack structure 100 in the above embodiment, and the specific structure and the operation principle thereof are not described in detail herein. After the multi-modal medical imaging system of the invention adopts the frame structure 100 of the above embodiment, the structural complexity can be reduced, and the later maintenance is convenient.

The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.