Pet-mr system and multi-modality imaging system

Abstract

The application relates to a PET-MR system and a multi-modal imaging system, the PET-MR system comprising a support cylinder, a PET detector, a radio frequency transmitting assembly and a shielding layer, the support cylinder comprising a first section and a second section arranged along an axial direction, and the first section and the second section being axially isolated from each other; the PET detector being arranged between the first section and the second section; the radio frequency transmitting assembly being arranged on the support cylinder; and the shielding layer being arranged outside the support cylinder. The application designs the support cylinder as a two-section type, the first section and the second section are axially isolated from each other, and the PET detector is arranged between the first section and the second section, thereby forming a stable structure for dispersing the bearing. The design does not require the support cylinder to be used as a main bearing component alone, thereby reducing the structural load of the VTC, and through the collaborative support of the mounting ring and the PET detector, the structural stability of the whole system is ensured.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a PET-MR system and a multimodal imaging system. Background Technology

[0002] PET-MR (Positron Emission Tomography-Magnetic Resonance Imaging) systems, as a multimodal imaging device, combine the advantages of PET and MR, providing simultaneous functional metabolic information and soft tissue anatomical information. Modern PET-MR systems employ an integrated design, combining the PET detector and MR scanner in the same device to achieve synchronous data acquisition and reduce image registration errors.

[0003] In related technologies, PET-MR systems are divided into two design schemes: the first scheme is an integrated design of the support cylinder and the mounting ring, and the second scheme is a separate dual-cylinder design of the support cylinder and the mounting ring.

[0004] like Figure 1 As shown, in the first scheme, the support tube adopts a thick-walled structure and serves as the main load-bearing component, fixed to the mounting ring by integrated potting or screw locking. The radio frequency (RF) transmitter assembly is arranged on the inner wall of the support tube, and an RF shielding layer is attached to the outer wall. Furthermore, to isolate the RF transmitter assembly from the patient, a separate outer casing is required inside the support tube. However, in the above scheme, the positron's movement path must pass through multiple layers of the support tube, including high-density fiberglass, foam, the RF transmitter assembly, and the outer casing. This results in a long attenuation path and significant attenuation due to material stacking, reducing PET sensitivity. Moreover, the distance between the RF transmitter assembly and the shielding layer depends on the thickness of the support tube; increasing the distance would lead to excessive overall weight. Even with foam filling optimization, the VTC's emission efficiency remains low.

[0005] like Figure 2 As shown, in the second scheme, the support cylinder adopts a thin-walled structure and is suspended on an independent birdcage mounting ring. The support cylinder does not serve as a load-bearing component; its inner wall also functions as the exterior surface, eliminating the need for a separate exterior cylinder. The mounting ring serves as the primary load-bearing structure and provides the mechanical interface between PET and VTC. The outer wall of the support cylinder is fitted with the RF transmitting assembly, and the inner wall of the mounting ring is fitted with a shielding layer. However, in the above scheme, if the bed rail is to be integrated, the fiberglass thickness of the support cylinder must be at least 4mm to meet the load-bearing requirements. Thicker materials will still increase positron attenuation. The shielding layer needs to be adhered to the uneven area of ​​the inner wall of the mounting ring, making it difficult to fully fix the shielding layer and affecting the stability of RF performance.

[0006] In summary, existing VTC designs suffer from problems such as excessive attenuation, insufficient transmission efficiency, and poor structural stability and shielding layer fixation. Utility Model Content

[0007] Therefore, it is necessary to provide a PET-MR system and a multimodal imaging system to address the problems of excessive attenuation, insufficient emission efficiency, poor structural stability and shielding layer fixation in existing VTC designs.

[0008] Embodiments of this application provide a PET-MR system, the PET-MR system comprising:

[0009] The support cylinder includes a first section and a second section arranged in an axial direction, and the first section and the second section are axially isolated from each other;

[0010] A PET detector is positioned between the first and second segments;

[0011] A radio frequency transmitting component is disposed on the support cylinder;

[0012] A shielding layer is provided on the outside of the support cylinder.

[0013] In one embodiment, a shielding attachment layer is further included, the shielding attachment layer being disposed between the support cylinder and the shielding layer, and / or between the filler and the shielding layer.

[0014] In one embodiment, it further includes:

[0015] A filler is disposed between and connected to the first and second segments, wherein the attenuation of radiation rays by the filler is less than that of radiation rays by the support cylinder;

[0016] The mounting ring includes a first ring body and a second ring body. The first ring body is fitted onto the first segment, and the second ring body is fitted onto the second segment to support the two ends of the PET detector, respectively.

[0017] In one embodiment, an antenna attachment layer is further included, which is disposed on the inner wall of the cylindrical structure formed by the support cylinder and the filler, and the radio frequency transmitting assembly is disposed on the antenna attachment layer.

[0018] In one embodiment, the device further includes multiple sets of first fastening units, each set of first fastening units including multiple first fasteners arranged circumferentially on the first ring body, and the end of the PET detector is connected to the first ring body via the first fastening units; and / or,

[0019] It also includes multiple sets of second fastening units, each set of second fastening units including multiple second fasteners arranged circumferentially in the second ring body, and the end of the PET detector is connected to the second ring body through the second fastening units.

[0020] In one embodiment, an outer casing is also included within the support casing;

[0021] The radio frequency transmitting component is located between the outer wall of the outer casing and the inner wall of the support casing.

[0022] In one embodiment, the PET detector includes a PET housing, which includes a first carbon fiber layer, a copper mesh layer, and a second carbon fiber layer that are connected and arranged sequentially.

[0023] This application also provides a multimodal imaging system, including:

[0024] The gradient coils of the magnetic resonance imaging (MRI) scanner surround and form a receiving cavity.

[0025] The radio frequency transmission component of the magnetic resonance imaging (MRI) scanner is disposed within the receiving cavity;

[0026] The PET detector of the positron emission tomography (PET) scanner is disposed within the receiving cavity;

[0027] Also includes:

[0028] A support cylinder comprising a first section and a second section arranged along an axial direction, wherein the radio frequency transmitting component spans between the first section and the second section and is located inside the support cylinder;

[0029] The PET detector is at least partially disposed between the first segment and the second segment, and the PET detector is located outside the support cylinder.

[0030] In one embodiment, a perforation is provided between the first and second sections of the support cylinder, and the perforated area is filled with foam material.

[0031] This application also provides a multimodal imaging system, including:

[0032] The gradient coils of the magnetic resonance imaging (MRI) scanner surround and form a receiving cavity.

[0033] The radio frequency transmission component of the magnetic resonance imaging (MRI) scanner is disposed in the receiving cavity;

[0034] The PET detector of the positron emission tomography (PET) scanner is disposed in the receiving cavity;

[0035] Also includes:

[0036] The support cylinder includes a first segment and a second segment arranged along the axial direction, and the first segment and the second segment are axially spaced apart from each other. The first segment and the second segment are both made of rigid material, and the space between the first segment and the second segment is made of non-rigid material.

[0037] The radio frequency transmitting assembly is fixed to the inside of the support cylinder;

[0038] The PET detector is disposed on the outside of the support cylinder, and the PET detector spans between the first section and the second section.

[0039] In one embodiment, the first segment and the second segment are integrally formed, and the space between the first segment and the second segment is a hollow structure, which is filled with the non-rigid material.

[0040] In one embodiment, the first segment and the second segment are two independent cylinders, and the two cylinders and the non-rigid material potting material disposed between them form an integral structure.

[0041] Compared to existing thick-walled fiberglass structures with integral support cylinders, the PET-MR system described in this application features a two-section support cylinder design. The first and second sections are axially isolated from each other, and the PET detector is positioned between the first and second sections, forming a stable structure with distributed load-bearing. This design eliminates the need for the support cylinder as a separate primary load-bearing component, reducing the structural load on the VTC (Vehicle Traction Center) and ensuring the overall structural stability of the system through the coordinated support of the mounting ring and the PET detector.

[0042] Moreover, the radio frequency transmitting component is located on the support cylinder, and the shielding layer is located on the outer circumferential surface of the support cylinder. This avoids the fixing problems caused by the shielding layer being pasted on an uneven surface in the prior art, ensuring the stability of the radio frequency signal and reducing eddy current interference and noise. Attached Figure Description

[0043] Figure 1 This is a partial cross-sectional view of the first scheme in the background art.

[0044] Figure 2 This is a partial cross-sectional view of the second scheme in the background art.

[0045] Figure 3 This is a schematic diagram of the support cylinder provided in an embodiment of this application.

[0046] Figure 4 This is a schematic diagram of the mounting ring provided in an embodiment of this application.

[0047] Figure 5 A partial cross-sectional view of the PET-MR system provided in the embodiments of this application.

[0048] Figure 6 A schematic diagram of a structure with a filler between the first and second segments provided in an embodiment of this application.

[0049] Figure 7This is a schematic diagram of the structure of the shielding attachment layer on the outer wall of the support cylinder provided in the embodiment of this application.

[0050] Figure 8 This is a schematic diagram of the structure of the shielding layer laid on the outer wall of the support cylinder according to an embodiment of this application.

[0051] Figure 9 This is a schematic diagram of the structure of the antenna attachment layer laid on the inner wall of the support cylinder according to an embodiment of this application.

[0052] Figure 10 This is a schematic diagram of the structure of the radio frequency transmitting assembly laid on the inner wall of the support cylinder according to an embodiment of this application.

[0053] Figure 11 This is a schematic diagram of a structure in which a PET detector is disposed between a first ring body and a second ring body, as provided in an embodiment of this application.

[0054] Figure 12 This is a schematic diagram of the structure of the bird coil provided in an embodiment of this application.

[0055] Figure label:

[0056] 100. Support cylinder; 110. First section; 120. Second section;

[0057] 200. Filler parts;

[0058] 300. Mounting ring; 310. First ring body; 320. Second ring body;

[0059] 400. PET detector;

[0060] 500. Radio frequency transmitting assembly; 510. Antenna attachment layer;

[0061] 600. Shielding layer; 610. Shielding attachment layer;

[0062] 700, outer casing;

[0063] 800, Birdcage coil; 810, Crossbar section; 811, Crossbar sub-unit; 820, End; 821, End sub-unit. Detailed Implementation

[0064] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0065] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0066] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0068] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0070] This application provides a PET-MR system, such as Figures 3 to 5 As shown, the PET-MR system includes:

[0071] The support cylinder 100 includes a first section 110 and a second section 120 arranged along the axial direction, and the first section 110 and the second section 120 are axially isolated from each other.

[0072] PET detector 400 is positioned between the first segment 110 and the second segment 120;

[0073] The radio frequency transmitting component 500 is mounted on the support cylinder 100;

[0074] The shielding layer 600 is located on the outside of the support cylinder 100.

[0075] Compared to existing thick-walled fiberglass structures with integral support cylinders, the PET-MR system described in this application designs the support cylinder 100 as a two-section structure, with the first section 110 and the second section 120 axially isolated from each other. The PET detector 400 is positioned between the first section 110 and the second section 120, forming a stable structure with distributed load-bearing. This eliminates the need for the support cylinder 100 to function as a separate primary load-bearing component, reducing the structural load on the VTC (Vehicle Traction Control Unit) and ensuring the overall structural stability of the system through the coordinated support of the mounting ring 300 and the PET detector 400.

[0076] Moreover, the radio frequency transmitting component 500 is disposed on the support cylinder 100, and the shielding layer 600 is disposed on the outside of the support cylinder 100, which avoids the fixing problem caused by the shielding layer 600 being pasted on an uneven surface in the prior art, ensuring the stability of the radio frequency signal and reducing eddy current interference and noise impact.

[0077] It should be noted that VTC refers to the volumetric transmitting coil. Mounting ring 300 is used to mount the PET detector 400. Axial isolation between the first segment 110 and the second segment 120 means that the components of the first segment 110 and the second segment 120 are physically separated, not completely disconnected.

[0078] It should be noted that the first section 110 and the second section 120 of the support cylinder 100 can be made of rigid non-metallic materials, such as fiberglass or carbon fiber composites. Fiberglass and carbon fiber composites have high rigidity and mechanical strength, and can perform functions such as load-bearing and deformation resistance.

[0079] In one embodiment, the radio frequency transmitting component 500 may span between the first segment 110 and the second segment 120. The radio frequency transmitting component 500 may be a birdcage coil 800. For example, Figure 12 As shown, the birdcage coil 800 includes multiple crossbars 810 and two ends 820. The crossbars 810 are provided with horizontal end antennas, and the ends 820 are provided with end loop antennas. The ends 820 are provided at both ends of the crossbars 810 and at both ends between two adjacent crossbars 810, and the crossbars 810 are respectively connected to the ends 820 at both ends. The multiple crossbars 810 are arranged at intervals along the circumference of the birdcage coil 800, and the crossbars 810 extend along the axial direction of the birdcage coil 800. The crossbar section 810 includes multiple crossbar sub-units 811 arranged sequentially adjacent to each other along the axial direction of the birdcage coil 800. Adjacent crossbar sub-units 811 are connected by a capacitor. Typically, two adjacent crossbar sub-units 811 located in the middle of the crossbar section 810 are connected by a fixed capacitor, while two crossbar sub-units 811 on the crossbar section 810 near the end 820, or crossbar sub-units 811 on the crossbar section 810 used for connection to the end 820, are connected by adjustable capacitors. This arrangement allows the error of each fixed capacitor to be adjusted by the adjustable capacitor, thereby achieving precise transmission frequency calibration. Furthermore, each end 820 includes multiple end sub-units 821, which are arranged at intervals along the circumference of the birdcage coil 800 to form a ring-shaped end 820.

[0080] In this embodiment, two adjacent crossbars 810, together with a plurality of end subunits 821 located between these two crossbars 810, form a loop. Therefore, the birdcage coil 800 includes a plurality of loops arranged circumferentially, and the number of loops is equal to the number of crossbars 810 of the birdcage coil 800. Optionally, in the axial direction, the number of loops can be one, two, or more, to ensure that the loop spans between the first segment 110 and the second segment 120. When the number of loops is multiple, adjacent loops in the axial direction can overlap.

[0081] The PET detector 400 can also span between the first segment 110 and the second segment 120.

[0082] In one embodiment, such as Figure 3 As shown, the PET-MR system also includes:

[0083] The filler 200 is positioned between the first segment 110 and the second segment 120 and is connected to the first segment 110 and the second segment 120. The attenuation of radiation rays by the filler 200 is less than the attenuation of radiation rays by the support cylinder 100.

[0084] The mounting ring 300 includes a first ring body 310 and a second ring body 320. The first ring body 310 is fitted onto the first segment 110, and the second ring body 320 is fitted onto the second segment 120 to support the two ends of the PET detector 400, respectively.

[0085] By setting a filler 200 between the first segment 110 and the second segment 120, the attenuation of radiation rays by the filler 200 is less than that by the support cylinder 100. Therefore, the material attenuation on the positron motion path in the detection area of ​​the PET detector 400 is reduced, improving the sensitivity and signal-to-noise ratio of PET imaging. Furthermore, by connecting the first segment 110 and the second segment 120 with the filler 200, the structural integrity of the segmented support cylinder 100 is enhanced, and relative displacement between the two segments is avoided. By mounting the first ring 310 and the second ring 320 of the mounting ring 300 onto the first segment 110 and the second segment 120 respectively, an independent support structure is formed for both ends of the PET detector 400, realizing the distributed transmission of force and reducing the load on the support cylinder 100. By setting the filler 200 and the mounting ring 300, this application ensures low attenuation and high stability while taking into account both radio frequency performance and mechanical strength.

[0086] In addition, a filler 200 is provided between the first section 110 and the second section 120 of the support cylinder 100, which makes the support cylinder 100 of this application lighter than the existing overall thick-walled fiberglass structure of the support cylinder 100.

[0087] In one embodiment, such as Figure 3 As shown, the filler 200 is made of foam material. Foam material has an extremely low attenuation coefficient and density, which further reduces energy loss in the positron motion path compared to materials such as high-density fiberglass used in the support cylinder 100 in the prior art.

[0088] In this embodiment, the filler 200 is filled with PMI foam material (polymethacrylimide foam) between the first section 110 and the second section 120 of the support cylinder 100. This shortens the high-attenuation material path for positron penetration, reduces the attenuation superposition problem caused by the superposition of multiple materials, improves the positron capture efficiency of the PET detector 400, and enhances the imaging sensitivity.

[0089] Moreover, the low dielectric properties of PMI foam material can reduce interference with radio frequency signals, forming a good electromagnetic compatibility environment with the radio frequency transmitting component 500 located on the inner wall of the support cylinder 100 and the shielding layer 600 on the outer wall, indirectly helping to improve the transmission efficiency and stability of radio frequency signals, and avoiding signal loss or interference caused by the characteristics of the filling material itself.

[0090] In other embodiments, the filler 200 may also be made of a non-rigid material with tensile, compressive and bending properties, such as rubber or foam plastic.

[0091] In other embodiments, the filler 200 may also be made of low-attenuation polyurethane foam, polyimide foam, or aerogel composite material.

[0092] In one embodiment, such as Figure 3 As shown, the PET-MR system also includes a shielding attachment layer 610, which is disposed between the support cylinder 100 and the shielding layer 600, and / or between the filler 200 and the shielding layer 600. Specifically, the shielding attachment layer 610 is disposed between the shielding layer 600 and the outer wall of the first segment 110, and / or the outer wall of the shielding layer 600 and the second segment 120, and / or the outer wall of the shielding layer 600 and the filler 200.

[0093] By setting the shielding attachment layer 610, the shielding attachment layer 610 can adapt to the material differences of the outer walls of different components (such as the fiberglass of the first section 110 and the second section 120 and the foam material of the filler 200). Through a uniform attachment layer transition, the adhesion consistency of the shielding layer 600 on different material surfaces is ensured, ensuring the continuity and uniformity of the shielding effect on the entire outer wall of the support cylinder 100. Moreover, the shielding attachment layer 610 can fill any minor unevenness or gaps that may exist on the outer walls of the first section 110, the second section 120 and the outer wall of the filler 200, providing a flat and continuous attachment surface for the shielding layer 600. This ensures that the shielding layer 600 is tightly attached to the outer wall of the support cylinder 100, avoiding any impact on the radio frequency shielding effect due to loosening or lifting of the shielding layer 600.

[0094] In this embodiment, the shielding attachment layer 610 is made of 0.5mm low-density fiberglass. In other embodiments, the shielding attachment layer 610 may also be made of other materials.

[0095] In one embodiment, such as Figure 3As shown, the PET-MR system also includes an antenna attachment layer 510 (attachment layer for the radio frequency transmitting assembly 500). The antenna attachment layer 510 is disposed on the inner wall of the cylindrical structure formed by the support cylinder 100 and the filler 200, and the radio frequency transmitting assembly 500 is disposed on the antenna attachment layer 510. By providing the antenna attachment layer 510 on the inner wall of the cylindrical structure formed by the support cylinder 100 and the filler 200, and then disposing the radio frequency transmitting assembly 500 on the antenna attachment layer 510, it is convenient to fix the radio frequency transmitting assembly 500 to the inner wall of the support cylinder 100.

[0096] Moreover, by setting the antenna attachment layer 510, for the segmented structure of the support cylinder 100, the antenna attachment layer 510 can form a uniform transition layer on the inner wall of the first segment 110, the second segment 120 and the filler 200, reducing the impact of physical or material differences at the joint of the inner walls of different components on the radio frequency transmission assembly 500, and enhancing the stability of the system's radio frequency performance.

[0097] In this embodiment, the antenna attachment layer 510 is made of 0.5mm low-density fiberglass. In other embodiments, the antenna attachment layer 510 may also be made of other materials.

[0098] In one embodiment, the PET-MR system further includes a first connector for connecting the first segment 110 and the second segment 120. During the manufacturing process of the PET-MR system, the first connector connects the first segment 110 and the second segment 120 of the support cylinder 100, avoiding relative displacement or shaking caused by the independent setting of the two segments, facilitating quick alignment of the relative positions of the two cylinder segments during production, and reducing assembly errors.

[0099] Understandably, once the manufacturing is complete, the first connector can be removed.

[0100] In this embodiment, the first connector is disposed inside the support cylinder 100. The first connector includes a first connecting plate and a first locking member. The end of the first connector is connected to the first segment 110 or the second segment 120 through the first locking member.

[0101] In this embodiment, multiple first connectors are provided, and the multiple first connectors are arranged at intervals around the inner wall of the support cylinder 100.

[0102] In this embodiment, the first ring 310 and the first segment 110 are connected by a potting process, and the second ring 320 and the second segment 120 are connected by a potting process. The potting process creates a tight, gapless connection between the first ring 310 and the first segment 110, and between the second ring 320 and the second segment 120. After the adhesive cures, it completely encapsulates the contact area between the ring and the cylinder, dispersing the stress points and avoiding the localized stress concentration problems that may occur with traditional screw connections. The potting process also makes the segmented structure of the mounting ring 300 and the support cylinder 100 a rigid whole, improving the system's resistance to vibration and deformation during operation.

[0103] In this embodiment, the PET-MR system further includes a second connector for connecting the first ring 310 and the second ring 320 during glue dispensing. Before the glue dispensing process, the first ring 310 and the second ring 320 are pre-connected and fixed using the second connector to avoid misalignment between the first ring 310 and the first segment 110, and between the second ring 320 and the second segment 120, caused by ring displacement during glue dispensing. This ensures the coaxiality and assembly accuracy of the mounting ring 300 and the support cylinder 100, preventing uneven attenuation paths or structural stress concentration caused by positional offset.

[0104] Moreover, during the glue-pouring process, before the glue is fully cured, the first ring 310 and the second ring 320 may move relative to each other due to external forces. The second connector temporarily fixes the two together through mechanical constraints, so that the contact state between the ring and the cylinder segment remains stable, ensuring that the glue is evenly filled in the connection gap and avoiding defects such as air bubbles and insufficient glue.

[0105] It should be noted that the second connector in this application serves as a temporary connection during the glue-filling stage, forming a temporary overall frame for the first ring 310, the second ring 320, the first segment 110, the second segment 120, and the PET detector 400, facilitating subsequent docking of the PET detector 400 with the ring. The second connector can be removed after glue-filling is completed.

[0106] It should be noted that during the potting process, epoxy resin is used to fill the gaps between the first ring 310 and the first segment 110, and between the second ring 320 and the second segment 120. Epoxy resin has strong chemical stability, good aging resistance, and good temperature resistance. The glue layer after potting has a certain rigidity and strength, ensuring the connection stability between the first ring 310 and the first segment 110, and between the second ring 320 and the second segment 120.

[0107] In this embodiment, the second connector includes a second connecting plate and a second locking member, and the end of the second connector is connected to the first ring body 310 or the second ring body 320 through the second locking member.

[0108] In this embodiment, multiple second connectors are provided, and the multiple second connectors are arranged at intervals around the outer wall of the support cylinder 100.

[0109] In one embodiment, the PET-MR system further includes multiple sets of first fastening units, each set of first fastening units including multiple first fasteners arranged circumferentially on the first ring body 310, and the end of the PET detector 400 is connected to the first ring body 310 through the first fastening units; and / or, the PET-MR system further includes multiple sets of second fastening units, each set of second fastening units including multiple second fasteners arranged circumferentially on the second ring body 320, and the end of the PET detector 400 is connected to the second ring body 320 through the second fastening units.

[0110] The end of the PET detector 400 is connected to the first ring body 310 via multiple sets of first fastening units, and / or connected to the second ring body 320 via second fastening units. Each set of fastening units includes multiple fasteners arranged circumferentially on the ring body, so that the PET detector 400 and the mounting ring 300 are connected under uniform force, avoiding stress concentration at the connection point and enhancing structural stability and rigidity.

[0111] In this embodiment, the first fastener and the second fastener are screws. In other embodiments, the first fastener and the second fastener may also be other fastening structures, such as bolts, pins, etc.

[0112] In one embodiment, please refer to the reference. Figure 5 The PET-MR system also includes an outer casing 700 disposed within the support casing 100. The outer casing 700, located within the support casing 100, directly isolates the radio frequency emission assembly 500 on the inner wall of the support casing 100 from the patient, preventing direct contact between the patient and the radio frequency emission assembly 500 and reducing potential interference from the components. Furthermore, the surface of the outer casing 700 can be designed with a smooth and flat structure, improving patient comfort and safety when entering the examination channel.

[0113] In this embodiment, the outer casing 700 is made of 1.5mm low-density fiberglass. In other embodiments, the outer casing 700 may also be made of other materials.

[0114] In this embodiment, the radio frequency (RF) transmitter 500 is disposed between the outer wall of the outer casing 700 and the inner wall of the support casing 100. By placing the RF transmitter 500 in the interlayer space between the outer wall of the outer casing 700 and the inner wall of the support casing 100, a double physical isolation structure is formed. This not only isolates the patient from direct contact with the RF transmitter 500 using the outer casing 700, improving safety, but also fixes the RF transmitter 500 through the interlayer structure, preventing signal drift caused by vibration or displacement and ensuring the stability of RF signal transmission.

[0115] In one embodiment, the PET detector 400 includes a PET shell, which comprises a first carbon fiber layer, a copper mesh layer, and a second carbon fiber layer arranged sequentially and connected to each other. The first and second carbon fiber layers, serving as the outer and inner layers of the shell, possess high strength and low density, providing robust structural support for the PET detector 400. Simultaneously, compared to traditional metal shells, the carbon fiber material reduces the overall weight of the PET shell, decreasing the load on the mounting ring 300 and the support cylinder 100. The intermediate copper mesh layer exhibits excellent conductivity, reducing eddy current interference generated by the PET detector 400 in varying magnetic field environments, thus minimizing interference with the PET detection signal.

[0116] In one embodiment, the shielding layer 600 has multiple slits for suppressing eddy currents. The metal layer of the RF transmitting assembly 500 is prone to generating eddy currents in a changing magnetic field. The slits disrupt the closed paths of these eddy currents, dividing the originally continuous metal layer into discontinuous regions. This not only weakens the eddy current intensity and reduces energy loss caused by eddy currents, preventing additional heat from affecting device stability, but also reduces the interference of eddy currents on the uniformity of the MR magnetic field, thus reducing interference with the PET detection signal.

[0117] In this embodiment, multiple cutting slits are evenly distributed on the shielding layer 600, so that the conduction path of eddy currents at various points on the shielding layer 600 is evenly blocked. The evenly distributed cutting method can make the force on the shielding layer 600 more balanced and reduce structural weak points caused by excessive local cutting.

[0118] This application also provides the processing steps for the PET-MR system, such as... Figures 6 to 11 As shown:

[0119] First, install the inner wall first connector inside the entire VCT cylinder;

[0120] The middle area of ​​the entire VCT cylinder is cut off to form the first segment 110 and the second segment 120. At this time, the first segment 110 and the second segment 120 are connected by the first connector.

[0121] like Figure 6 As shown, a filler 200 is provided between the first segment 110 and the second segment 120;

[0122] like Figure 7 As shown, a shielding adhesion layer 610 is laid on the outer wall of the support cylinder 100;

[0123] like Figure 8 As shown, a 600mm shielding layer is applied.

[0124] The first ring 310 is fitted onto the first section 110, the second ring 320 is fitted onto the second section 120, and the first ring 310 and the second ring 320 are connected by the second connector. The glue-filling support cylinder 100 and the mounting ring 300 are integrated by the glue-filling process.

[0125] Remove the first connector;

[0126] like Figure 9 As shown, an antenna attachment layer 510 is laid on the inner wall of the support cylinder 100;

[0127] like Figure 10 As shown, the radio frequency transmitter assembly 500 is installed;

[0128] like Figure 11 As shown, remove the second connector and install the PET detector 400.

[0129] It should be noted that, Figure 8 This is merely an illustration of applying a shielding adhesion layer 610 to the outer wall of the filler 200.

[0130] It should be noted that in the PET-MR system of this application, the PET detector 400 bears the weight of two cylindrical sections (the section 110 connected to the first ring 310, and the section 120 connected to the second ring 320). The cold plate and plastic screws inside may face certain strength risks. In addition, the bolted connections between the PET detector 400 and the two cylindrical sections may increase the risk of creep in the polymer material due to excessive stress.

[0131] To address the two risks mentioned above, static simulation analysis under self-weight was conducted. The cold plate and plastic screws showed no strength risk, and the polymer material exhibited minimal creep risk due to lower stress. Finally, dynamic simulation of the entire detector ring was performed. By applying time-history loads to the supports at both ends, the stress-time-history response at the points of interest was calculated, and the results showed no strength risk.

[0132] In summary, the structural design verified through simulation not only meets the core requirement of low attenuation but also fully ensures the structural safety and stability of the system under static and dynamic conditions, thereby improving the long-term reliability and safety of the equipment in clinical applications.

[0133] This application also provides a multimodal imaging system, including:

[0134] The gradient coils of the magnetic resonance imaging (MRI) scanner are arranged around the cavity to form a receiving chamber.

[0135] The radio frequency transmission component of the magnetic resonance imaging (MRI) scanner is housed within the receiving cavity;

[0136] The detector of the positron emission tomography (PET) scanner is located in the receiving cavity;

[0137] The support cylinder 100 includes a first section 110 and a second section 120 arranged in the axial direction. The radio frequency transmitting component 500 spans between the first section 110 and the second section 120 and is located inside the support cylinder 100.

[0138] The PET detector 400 is at least partially disposed between the first segment 110 and the second segment 120, and the PET detector 400 is located outside the support cylinder 100.

[0139] The aforementioned multimodal imaging system, through the segmented layout of the support cylinder, positions the radio frequency (RF) transmitter 500 and the PET detector 400 respectively on the inner and outer sides of the support cylinder 100. This separates the RF transmitter 500 and the PET detector 400 within the housing cavity, reducing interference from the electromagnetic signals generated by the RF transmitter 500 during operation to the PET detector 400's detection process. Simultaneously, the RF transmitter 500 spans between the first segment 110 and the second segment 120 of the support cylinder 100, and the PET detector 400 is at least partially located between the first segment 110 and the second segment 120. The segmented structure of the support cylinder 100 provides mounting positions for both the RF transmitter 500 and the PET detector 400 without requiring excessive additional space within the housing cavity, thus optimizing the system's space utilization.

[0140] Optionally, the PET detector 400 of the positron emission tomography (PET) system may include multiple detector rings, which may all be located between the first segment 110 and the second segment 120, or a portion of the multiple detector rings may be located between the first segment 110 and the second segment 120.

[0141] In one embodiment, a perforation is provided between the first segment 110 and the second segment 120 of the support cylinder 100, and the perforated area is filled with foam material. By filling the perforated area with foam material, the weight of the support cylinder 100 is reduced. Moreover, the attenuation of radiation rays by the foam material is much less than that of the rigid material of the support cylinder 100 itself (such as fiberglass or carbon fiber composite material), which shortens the coverage length of the high-attenuation material on the positron movement path and reduces the energy loss of the positron signal during transmission.

[0142] Specifically, the foam material can be PMI foam (polymethacrylimide foam), rubber, foam plastic, low-attenuation polyurethane foam, polyimide foam, or aerogel composite material.

[0143] This application also provides a multimodal imaging system, including:

[0144] The gradient coils of the magnetic resonance imaging (MRI) scanner surround and form a receiving cavity.

[0145] The radio frequency transmission component 500 of the magnetic resonance imaging (MRI) scanner is located in the receiving cavity;

[0146] The PET detector 400 of the positron emission tomography (PET) scanner is located in the receiving cavity;

[0147] Also includes:

[0148] The support cylinder 100 includes a first section 110 and a second section 120 arranged along the axial direction, and the first section 110 and the second section 120 are axially spaced from each other. The first section 110 and the second section 120 are both made of rigid materials, and the space between the first section 110 and the second section 120 is made of non-rigid materials.

[0149] The radio frequency transmitting assembly 500 is fixed inside the support cylinder 100;

[0150] The PET detector 400 is located on the outside of the support cylinder 100, and the PET detector 400 spans between the first section 110 and the second section 120.

[0151] In the aforementioned multimodal imaging system, the first section 110 and the second section 120 of the support cylinder 100 are made of rigid material, providing a supporting foundation for the radio frequency transmitting assembly 500 and the PET detector 400. The interval between the first section 110 and the second section 120 is made of non-rigid material. Non-rigid materials attenuate radiation rays significantly less than rigid materials, shortening the length of high-attenuation material coverage on the positron's movement path and reducing the energy loss of the positron signal. The interval between the first section 110 and the second section 120 provides installation space for the PET detector 400.

[0152] In one embodiment, the first segment 110 and the second segment 120 are integrally formed, and the space between the first segment 110 and the second segment 120 is a hollow structure filled with non-rigid material. The first segment 110 and the second segment 120 are integrally formed, which can form a basic support frame without additional connectors, and the hollow structure between the first segment 110 and the second segment 120 facilitates the filling of non-rigid material.

[0153] In one embodiment, the first segment 110 and the second segment 120 are two independent cylindrical bodies, and the two cylindrical bodies and the non-rigid material disposed between them are encapsulated into a single structure. The first segment 110 and the second segment 120 are independent cylindrical bodies, and the appropriate size of the first segment 110 and the second segment 120 can be selected according to the installation requirements of the radio frequency transmitting component 500 and the PET detector 400 to adapt to the structural layout of multimodal imaging systems of different specifications; and the connection of the two cylindrical bodies and the non-rigid material disposed between them by encapsulation not only does not interfere with the transmission of radio frequency signals, but also fills the gap at the junction of the first segment 110 and the second segment 120.

[0154] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0155] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A PET-MR system, characterized in that, The PET-MR system includes: The support cylinder (100) includes a first section (110) and a second section (120) arranged in an axial direction, and the first section (110) and the second section (120) are axially isolated from each other; A PET detector (400) is disposed between the first segment (110) and the second segment (120); A radio frequency transmitting assembly (500) is disposed on the support cylinder (100); A shielding layer (600) is disposed on the outside of the support cylinder (100).

2. The PET-MR system according to claim 1, characterized in that, Also includes: A filler (200) is disposed between the first segment (110) and the second segment (120) and connected to the first segment (110) and the second segment (120), wherein the filler (200) has a smaller attenuation of radiation rays than the support cylinder (100) has. The mounting ring (300) includes a first ring body (310) and a second ring body (320). The first ring body (310) is fitted onto the first segment (110), and the second ring body (320) is fitted onto the second segment (120) to support the two ends of the PET detector (400) respectively.

3. The PET-MR system according to claim 2, characterized in that, It also includes a shielding attachment layer (610) disposed between the support cylinder (100) and the shielding layer (600), and / or between the filler (200) and the shielding layer (600).

4. The PET-MR system according to claim 2, characterized in that, It also includes an antenna attachment layer (510), which is disposed on the inner wall of the cylindrical structure formed by the support cylinder (100) and the filler (200), and the radio frequency transmitting assembly (500) is disposed on the antenna attachment layer (510).

5. The PET-MR system according to claim 2, characterized in that, It also includes multiple sets of first fastening units, each set of first fastening units including multiple first fasteners arranged circumferentially on the first ring body (310), and the end of the PET detector (400) is connected to the first ring body (310) through the first fastening units; and / or, It also includes multiple sets of second fastening units, each set of second fastening units including multiple second fasteners arranged circumferentially on the second ring body (320), and the end of the PET detector (400) is connected to the second ring body (320) through the second fastening units.

6. The PET-MR system according to claim 1, characterized in that, It also includes an outer casing (700) disposed within the support casing (100); The radio frequency transmitting component (500) is disposed between the outer wall of the outer casing (700) and the inner wall of the support casing (100).

7. The PET-MR system according to claim 1, characterized in that, The PET detector (400) includes a PET housing, which includes a first carbon fiber layer, a copper mesh layer, and a second carbon fiber layer that are connected and arranged in sequence.

8. A multimodal imaging system, comprising: The gradient coils of the magnetic resonance imaging (MRI) scanner surround and form a receiving cavity. The radio frequency transmission component of the magnetic resonance imaging (MRI) scanner is disposed within the receiving cavity; The PET detector (400) of the positron emission tomography (PET) system is disposed within the receiving cavity; Its features are, Also includes: A support cylinder (100) includes a first section (110) and a second section (120) arranged in an axial direction. The radio frequency transmitting component (500) spans between the first section (110) and the second section (120) and is located inside the support cylinder (100). The PET detector (400) is at least partially disposed between the first segment (110) and the second segment (120), and the PET detector (400) is located outside the support cylinder (100).

9. The multimodal imaging system according to claim 8, characterized in that, A perforation is provided between the first section (110) and the second section (120) of the support cylinder (100), and the perforated area is filled with foam material.

10. A multimodal imaging system, comprising: The gradient coils of the magnetic resonance imaging (MRI) scanner surround and form a receiving cavity. The radio frequency transmission assembly (500) of the magnetic resonance imaging (MRI) scanner is disposed in the receiving cavity; The PET detector (400) of the positron emission tomography (PET) scanner is disposed in the receiving cavity; Its features are, Also includes: A support cylinder (100) includes a first section (110) and a second section (120) arranged along the axial direction, wherein the first section (110) and the second section (120) are axially spaced apart from each other, the first section (110) and the second section (120) are both made of rigid materials, and the space between the first section (110) and the second section (120) is provided with a non-rigid material; The radio frequency transmitting assembly (500) is fixed to the inside of the support cylinder (100); The PET detector (400) is disposed on the outside of the support cylinder (100) and spans between the first segment (110) and the second segment (120).

11. The multimodal imaging system according to claim 10, characterized in that, The first segment (110) and the second segment (120) are integrally formed, and the space between the first segment (110) and the second segment (120) is a hollow structure, which is filled with the non-rigid material.

12. The multimodal imaging system according to claim 10, characterized in that, The first segment (110) and the second segment (120) are two independent cylinders, and the two cylinders and the non-rigid material potting between them are an integral structure.

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