A CT test phantom connection structure

Abstract

This utility model provides a CT test phantom connection structure, including a base plate. An adjustable telescopic rod is installed at the center of the top of the base plate, and a connecting plate is fixed to the top of the adjustable telescopic rod. A connecting sleeve is detachably connected to the top of the connecting plate, and three limiting components are provided at equal angles on the outer side wall of the connecting sleeve. Compared with the prior art, this utility model has the following advantages: For test phantoms equipped with magnetic blocks, the magnetic blocks can be directly adsorbed and attached to the magnetic groove on the top of the mounting plate, achieving quick assembly and disassembly; for phantoms with only threaded holes, T-bolts are used to connect to the threaded holes through a long strip groove. The design of the long strip groove allows the bolt to be adjusted radially, and even if there are deviations in the position of the threaded holes of different phantom specifications, a stable installation can be achieved. This achieves wide compatibility with different types and specifications of test phantoms, eliminating the need to design a special installation structure for each phantom, thus reducing usage costs.

Description

Technical Field

[0001] This utility model is a CT testing phantom connection structure, belonging to the field of phantom connection structures. Background Technology

[0002] In the performance testing of computed tomography (CT) equipment, the test phantom, as a standard tool for simulating the characteristics of human tissue, directly affects the accuracy and reliability of the test results due to the stability and adaptability of its connection structure. As CT technology develops towards high resolution, low dose, and multimodal imaging, higher requirements are placed on the installation accuracy, angle adjustment flexibility, and replacement efficiency of the test phantom.

[0003] Currently, common CT test phantom connection methods on the market mainly suffer from the following problems: First, while traditional single-bolt connection structures can ensure connection strength, the installation and disassembly process is cumbersome, requiring a significant amount of time to tighten or loosen each bolt individually. This is particularly problematic in testing scenarios where different types of phantoms need to be frequently replaced, severely impacting testing efficiency. Second, while some magnetic connection structures achieve rapid assembly, they suffer from insufficient positioning accuracy and poor vibration resistance. Under the vibration environment of CT equipment operation, this can easily lead to phantom displacement, affecting the accuracy of test data. Third, existing connection devices are typically only compatible with phantoms of specific specifications. When faced with test phantoms of different shapes, sizes, and interface forms, they lack versatility, requiring users to configure various special clamps, increasing testing costs and management difficulty. Furthermore, most connection structures struggle to achieve flexible multi-angle adjustment of the phantom, failing to meet the performance testing requirements of CT equipment at different scanning angles. Therefore, designing a CT test phantom connection structure is essential. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a CT test phantom connection structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a CT test phantom connection structure, comprising a base plate, an adjustable telescopic rod installed at the center of the top of the base plate, a connecting plate fixed to the top of the adjustable telescopic rod, a connecting sleeve detachably connected to the top of the connecting plate, and three limiting components set at equal angles on the outer side wall of the connecting sleeve, a rotating sleeve integrally connected to the center of the top of the connecting sleeve, a rotating ball rotatably connected inside the rotating sleeve, an annular fastening sleeve fitted on the outer side of the rotating ball, and the annular fastening sleeve threadedly connected to the rotating sleeve, a mounting plate fixed to the top of the rotating ball, and a test phantom mounted on the top of the mounting plate, three recessed grooves equally spaced at the edge of the top of the mounting plate, and a level embedded in the recessed grooves.

[0006] Furthermore, three locking blocks are provided at equal angles along the circumference at the top edge of the connecting plate, and three limiting grooves that slide and engage with the locking blocks are provided at corresponding positions on the inner sidewall of the connecting sleeve. During assembly, the locking blocks are first offset from the limiting grooves and then rotated into the limiting grooves. Each of the three limiting grooves has a baffle integrally provided at its end.

[0007] Furthermore, a magnetic groove is provided at the center of the top of the mounting plate, and twelve elongated through slots are evenly distributed radially on the mounting plate around the magnetic groove, with the two ends of the through slots being designed in a semi-circular arc shape.

[0008] Furthermore, a magnetic absorbing plate adapted to the magnetic absorbing groove is provided at the center of the bottom of the mold to be tested, and multiple protrusions at equal angles are provided on the bottom of the mold to be tested around the magnetic absorbing plate, and the protrusions are inserted into the elongated through groove.

[0009] Furthermore, multiple threaded holes are provided at equal angles at the bottom edge of the test mold body. During assembly, T-bolts are used to connect to the threaded holes by passing through the elongated through groove on the mounting plate.

[0010] Furthermore, the limiting assembly includes a sleeve, an adjusting member, a connecting rod, a compression spring, and a limiting block. The sleeve passes through and is fixed to the side wall of the connecting sleeve. The connecting rod is movably connected inside the sleeve, and the position of the sleeve corresponds to the limiting groove. The end of the connecting rod away from the limiting groove extends out of the sleeve, and an adjusting member is hinged to the connecting rod on the outside of the sleeve. The end of the connecting rod near the limiting groove is fixed to the limiting block, and the shape of the limiting block matches the shape inside the sleeve. A compression spring is wound around the outside of the connecting rod, and the two ends of the compression spring are respectively connected to the limiting block and the end inside the sleeve away from the limiting groove. A limiting hole matching the shape of the limiting block is opened on the outer wall of the locking block.

[0011] Furthermore, the rotating sleeve is composed of eight arc-shaped pieces arranged in a ring array, and the inner wall of the rotating sleeve is in contact with the outer wall of the rotating ball. There is a certain gap between each of the eight arc-shaped pieces, and anti-slip pads are adhered to the inner sidewalls of the arc-shaped pieces. External threads are provided on the outer sidewalls of the arc-shaped pieces. The annular fastening sleeve adopts a truncated conical structure with a smaller upper part and a larger lower part, and the inner hole of the annular fastening sleeve is provided with a trapezoidal internal thread that matches the external thread of the arc-shaped pieces. The rotating sleeve is threadedly connected to the annular fastening sleeve through the external thread.

[0012] Furthermore, the adjusting member has a vertically formed hinge groove in the center, and the end of the connecting rod is inserted into the hinge groove and hinged to it. The end of the adjusting member near the sleeve is vertical and fits against the sleeve. The top of the adjusting member is horizontal, and an arc-shaped transition part is provided at the angle between the horizontal end and the vertical plane. The bottom of the adjusting member extends downward to form a pinch part. When the adjusting member changes from vertical to horizontal, the limiting block and the limiting hole are completely separated.

[0013] The beneficial effects of this utility model are:

[0014] For test molds equipped with magnetic blocks, the magnetic plates can be directly attached to the magnetic groove on the top of the mounting plate for quick assembly and disassembly. For molds with only threaded holes, T-bolts are used to connect to the threaded holes through the elongated slot. The design of the elongated slot allows for radial adjustment of the bolt position, ensuring stable installation even if there are deviations in the position of the threaded holes for different mold sizes. The combination of the elongated slot and the magnetic groove enables wide compatibility with different types and sizes of test molds, eliminating the need to design a dedicated installation structure for each mold and reducing usage costs.

[0015] The magnetically attached test mold can be directly disassembled and replaced. For the test mold that is fixed with bolts, when it needs to be replaced, it is not necessary to unscrew all the bolts one by one. Just operate the limit component, move the adjustment piece to make the limit block disengage from the limit hole of the card block, and then separate the connecting plate and the connecting sleeve by the misalignment rotation of the card block and the limit groove. The installation plate and the test mold can be disassembled as a whole, which greatly shortens the replacement time.

[0016] The rotating ball and the rotating sleeve form a spherical pair connection. By rotating the annular fastening sleeve, the arc-shaped plate is made to contract and hug the rotating ball by cooperating with its external thread. During the rotation, the test model can be adjusted at multiple angles. After tightening the annular fastening sleeve, the anti-slip rubber pad ensures that the rotating ball is fixed, meeting the testing requirements of different scanning angles of CT equipment. Attached Figure Description

[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the assembly structure of a CT test phantom connection structure according to the present invention;

[0019] Figure 2 This is a schematic diagram of the disassembled structure of a CT test phantom connection structure according to the present invention;

[0020] Figure 3 This is a schematic diagram of the connecting plate structure of a CT test phantom connection structure according to the present invention;

[0021] Figure 4 This is a schematic diagram of the mounting plate structure of a CT test phantom connection structure according to the present invention;

[0022] Figure 5 This is a schematic diagram of the connecting sleeve structure of a CT test phantom connection structure according to the present invention;

[0023] Figure 6This is a schematic diagram of the first type of test phantom structure in the CT test phantom connection structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the second type of test phantom structure in the CT test phantom connection structure of this utility model;

[0025] Figure 8 This is a partial cross-sectional schematic diagram of the limiting component in the connection structure of a CT test phantom according to the present invention.

[0026] In the diagram: 1. Base plate; 2. Adjustable telescopic rod; 3. Connecting plate; 4. Connecting sleeve; 5. Mounting plate; 501. Through groove; 502. Magnetic suction groove; 503. Sinking groove; 6. Level; 7. Module to be tested; 701. Protrusion; 702. Magnetic suction piece; 703. Threaded hole; 8. Limiting component; 9. Limiting groove; 901. Baffle; 10. Rotating sleeve; 1001. Arc-shaped piece; 11. Rotating ball; 12. Annular fastening sleeve; 13. Clamping block; 1301. Limiting hole; 14. Sleeve; 15. Adjusting component; 1501. Arc-shaped transition part; 1502. Hand grip part; 1503. Hinge groove; 16. Connecting rod; 17. Compression spring; 18. Limiting block; 19. T-bolt. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0028] Please see Figures 1 to 8 This utility model provides a technical solution: a CT test phantom connection structure, including a base plate 1, an adjustable telescopic rod 2 installed at the center of the top of the base plate 1, and a connecting plate 3 fixed to the top of the adjustable telescopic rod 2. A connecting sleeve 4 is detachably connected to the top of the connecting plate 3, and three limiting components 8 are provided at equal angles on the outer side wall of the connecting sleeve 4. A rotating sleeve 10 is integrally connected to the center of the top of the connecting sleeve 4, and a rotating ball 11 is rotatably connected inside the rotating sleeve 10. An annular fastening sleeve 12 is sleeved on the outer side of the rotating ball 11, and the annular fastening... The sleeve 12 is threadedly connected to the rotating sleeve 10. The top of the rotating ball 11 is fixed with the mounting plate 5, and the top of the mounting plate 5 is equipped with the test mold 7. Three recessed grooves 503 are equally spaced at the edge of the top of the mounting plate 5, and a level 6 is embedded in the recessed groove 503. The spherical pair formed by the rotating sleeve 10 and the rotating ball 11, combined with the annular fastening sleeve 12, can realize multi-angle flexible adjustment and stable locking. The three level instruments 6 are arranged in an equilateral triangle to form a three-dimensional horizontal monitoring system, which can intuitively display the pitch, tilt and overall horizontal deviation of the mounting plate 5.

[0029] For example, three locking blocks 13 are provided at the top edge of the connecting plate 3 at equal angles along the circumference, and three limiting grooves 9 are provided at the corresponding positions on the inner side wall of the connecting sleeve 4 to slide and engage with the locking blocks 13. During assembly, the locking blocks 13 are first offset from the limiting grooves 9 and then rotated into the limiting grooves 9. The ends of the three limiting grooves 9 are all integrally provided with baffles 901. The locking blocks 13 of the connecting plate 3 and the limiting grooves 9 of the connecting sleeve 4 adopt an offset rotation connection method. During assembly, no additional tools are needed. It is only necessary to insert the locking blocks 13 into the limiting grooves 9 offsetly, and then rotate the connecting plate 3 to make the locking blocks 13 engage into the limiting grooves 9. Compared with the traditional bolt connection, the assembly time is greatly shortened and the work efficiency is improved. The baffles 901 at the end of the limiting grooves 9 play a key limiting role. When the locking blocks 13 are rotated into the limiting grooves 9, the baffles 901 can prevent the locking blocks 13 from moving further.

[0030] For example, a magnetic groove 502 is provided at the center of the top of the mounting plate 5, and twelve elongated through grooves 501 are evenly distributed radially on the mounting plate 5 around the magnetic groove 502. The two ends of the through grooves 501 are designed with a semi-circular arc shape. The semi-circular arc shape at the two ends of the through grooves 501 avoids stress concentration at right-angle edges, thereby improving the structural strength and service life of the mounting plate 5. On the other hand, the semi-circular arc shape makes the T-bolt 19 move more smoothly in the through grooves 501.

[0031] Please see Figure 4 and Figure 6 A magnetic absorbing piece 702 adapted to the magnetic absorbing groove 502 is provided at the center of the bottom of the mold 7 to be tested. Multiple protrusions 701 are provided at equal angles on the bottom of the mold 7 to be tested around the magnetic absorbing piece 702. The protrusions 701 are inserted into the elongated through groove 501. The central magnetic absorbing piece 702 and the magnetic absorbing groove 502 of the mounting plate 5 form a strong attraction. The insertion of the protrusions 701 into the elongated through groove 501 can prevent the mold 7 to be tested from rotating.

[0032] Please see Figure 4 and Figure 7 Multiple threaded holes 703 are provided at equal angles at the bottom edge of the mold body 7. During assembly, T-bolts 19 are used to pass through the elongated through groove 501 on the mounting plate 5 and connect to the threaded holes 703. The T-bolts 19 are used to pass through the through groove 501 and connect to the threaded holes 703 at the bottom of the mold body 7, which meets the installation requirements of different types of mold bodies and greatly improves the versatility of the structure.

[0033] Please see Figure 5 and Figure 8The limiting assembly 8 includes a sleeve 14, an adjusting member 15, a connecting rod 16, a compression spring 17, and a limiting block 18. The sleeve 14 passes through and is fixed to the side wall of the connecting sleeve 4. The connecting rod 16 is movably connected inside the sleeve 14, and the position of the sleeve 14 corresponds to the limiting groove 9. The end of the connecting rod 16 away from the limiting groove 9 extends out of the sleeve 14, and the adjusting member 15 is hinged to the connecting rod 16 on the outside of the sleeve 14. The limiting block 18 is fixed to the end of the connecting rod 16 near the limiting groove 9, and the shape of the limiting block 18 matches the internal shape of the sleeve 14. The compression spring 17 is wound around the outside of the connecting rod 16, and the two ends of the compression spring 17... The locking block 13 is connected to the end of the locking block 18 and the sleeve 14 that is away from the locking groove 9. The outer wall of the locking block 13 has a locking hole 1301 that matches the shape of the locking block 18. When the adjusting member 15 is moved, the original horizontal top of the adjusting member 15 turns into a vertical position that fits with the end of the sleeve 14. When rotating, the adjusting member 15 will pull the connecting rod 16 outward, and the compression spring 17 will be further compressed. The locking block 18 will disengage from the locking hole 1301 of the locking block 13. At this time, the connecting sleeve 4 will be rotated so that the locking block 13 and the locking groove 9 are misaligned and can be separated. The mounting plate 5 and the mold body to be tested can be disassembled as a whole, which greatly shortens the replacement time.

[0034] Please see Figure 2 and Figure 5 The rotating sleeve 10 consists of eight arc-shaped pieces 1001 arranged in a ring array. The inner wall of the rotating sleeve 10 fits against the outer wall of the rotating ball 11. There is a certain gap between each of the eight arc-shaped pieces 1001. Anti-slip pads are adhered to the inner sidewalls of the arc-shaped pieces 1001, and external threads are provided on the outer sidewalls of the arc-shaped pieces 1001. The annular fastening sleeve 12 adopts a truncated conical structure with a smaller upper part and a larger lower part. The inner hole of the annular fastening sleeve 12 is provided with a hole that intersects with the outer side of the arc-shaped pieces 1001. The rotating sleeve 10 is connected to the annular fastening sleeve 12 by the external thread of the trapezoidal internal thread matching the thread. The gap reserved between the arc-shaped pieces 1001 should be able to withstand thermal expansion and stress. The inner anti-slip rubber pad enhances the friction. The trapezoidal external thread on the outer side of the arc-shaped piece 1001 matches the conical trapezoidal internal thread of the annular fastening sleeve 12, which is smaller at the top and larger at the bottom. Rotating the annular fastening sleeve 12 can make the arc-shaped pieces 1001 contract synchronously, realizing multi-angle flexible adjustment and stable locking of the rotating ball 11.

[0035] Please see Figure 8The adjusting member 15 has a vertically formed hinge groove 1503 in the center, and the end of the connecting rod 16 is inserted into the hinge groove 1503 and hinged to the hinge groove 1503. The end of the adjusting member 15 near the sleeve 14 is vertical and fits against the sleeve 14. The top of the adjusting member 15 is horizontal, and an arc-shaped transition part 1501 is provided at the angle between the horizontal end and the vertical plane. The bottom of the adjusting member 15 extends downward to form a pinch part 1502. When the adjusting member 15 changes from vertical to horizontal, the limiting block 18 and the limiting hole 1301 are completely separated. The distance between the horizontal plane of the adjusting member 15 and the hinge point between it and the connecting rod 16 is greater than the distance between the vertical plane and the hinge point between it and the connecting rod 16. The arc-shaped transition part 1501 design eliminates the risk of stress concentration and optimizes the operating feel.

[0036] Detailed implementation: In use, the locking block 13 of the connecting plate 3 is inserted into the limiting groove 9 of the connecting sleeve 4 after being misaligned, and then rotated. The locking block 13 is locked into the limiting groove 9, and the end baffle 901 prevents axial dislodgement, achieving initial circumferential positioning. The compression spring 17 of the limiting component 8 pushes the limiting block 18 into the limiting hole 1301 of the locking block 13, forming a secondary lock. The rotating ball 11 and the eight arc-shaped pieces 1001 of the rotating sleeve 10 form a spherical pair, which can achieve ±45° pitch angle and 360° circumferential rotation. The rotating annular fastening sleeve 12 has a conical structure with a smaller upper section and a larger lower section. Its trapezoidal internal thread is engaged with the external thread of the arc-shaped piece 1001. Through axial displacement, the arc-shaped piece 1001 is synchronously contracted towards the center. The inner anti-slip rubber pad holds the rotating ball 11 tightly, ensuring stable locking at any angle. The magnetic 702 of the test mold 7 is attracted to the magnetic groove 502 of the mounting plate 5, and the outer peripheral protrusion 701 is inserted into the through groove 501 to restrict circumferential rotation. For the test mold 7 without magnetic attraction, the T-bolt 19 passes through the elongated through groove 501 and connects with the threaded hole 703 to complete the fixation. The magnetic test mold 7 can be directly picked up and put in. The bolt-fixed test mold 7 does not need to be disassembled one by one. It is only necessary to unlock the connecting plate 3 and the connecting sleeve 4 through the limiting component 8, and disassemble the mounting plate 5 and the test mold 7 as a whole, so as to facilitate the quick and easy next set of tests.

[0037] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A CT testing phantom connection structure, comprising a base plate (1), characterized in that: An adjustable telescopic rod (2) is installed at the center of the top of the base plate (1), and a connecting plate (3) is fixed at the top of the adjustable telescopic rod (2). A connecting sleeve (4) is detachably connected to the top of the connecting plate (3), and three limiting components (8) are provided at equal angles on the outer side wall of the connecting sleeve (4). A rotating sleeve (10) is integrally connected at the center of the top of the connecting sleeve (4), and a rotating ball (11) is rotatably connected inside the rotating sleeve (10). An annular fastening sleeve (12) is fitted on the outer side of the rotating ball (11), and the annular fastening sleeve (12) is threadedly connected to the rotating sleeve (10). An installation plate (5) is fixed at the top of the rotating ball (11), and a test mold (7) is installed at the top of the installation plate (5). Three sinking grooves (503) are opened at equal angles at the edge of the top of the installation plate (5), and a level (6) is embedded in the sinking groove (503).

2. The CT test phantom connection structure according to claim 1, characterized in that: Three locking blocks (13) are provided at the edge of the top of the connecting plate (3) at equal angles along the circumference, and three limiting grooves (9) are provided at the corresponding positions on the inner side wall of the connecting sleeve (4) to slide with the locking blocks (13). During assembly, the locking blocks (13) are first offset from the limiting grooves (9) and then rotated into the limiting grooves (9). The ends of the three limiting grooves (9) are all integrally provided with baffles (901).

3. The CT test phantom connection structure according to claim 1, characterized in that: A magnetic groove (502) is provided at the center of the top of the mounting plate (5), and twelve long strip-shaped through grooves (501) are evenly distributed radially on the mounting plate (5) around the magnetic groove (502). The two ends of the through grooves (501) are designed in a semi-circular arc shape.

4. The CT test phantom connection structure according to claim 1, characterized in that: A magnetic absorbing piece (702) adapted to the magnetic absorbing groove (502) is provided at the center of the bottom of the test mold (7), and multiple protrusions (701) are provided at equal angles on the bottom of the test mold (7) on the outer periphery of the magnetic absorbing piece (702), and the protrusions (701) are inserted into the elongated through groove (501).

5. The CT test phantom connection structure according to claim 1, characterized in that: The test mold (7) has multiple threaded holes (703) at equal angles at the bottom edge. During assembly, T-bolts (19) are used to pass through the long slot (501) on the mounting plate (5) and connect to the threaded holes (703).

6. The CT test phantom connection structure according to claim 2, characterized in that: The limiting assembly (8) includes a sleeve (14), an adjusting member (15), a connecting rod (16), a compression spring (17), and a limiting block (18). The sleeve (14) passes through the side wall of the connecting sleeve (4) and is fixed thereto. The connecting rod (16) is movably connected inside the sleeve (14), and the position of the sleeve (14) corresponds to the limiting groove (9). The end of the connecting rod (16) away from the limiting groove (9) extends out of the sleeve (14), and an adjusting member is hinged to the connecting rod (16) on the outside of the sleeve (14). (15) A limiting block (18) is fixed at one end of the connecting rod (16) near the limiting groove (9), and the shape of the limiting block (18) matches the internal shape of the sleeve (14). A compression spring (17) is wound around the outside of the connecting rod (16), and the two ends of the compression spring (17) are respectively connected to the limiting block (18) and the end of the sleeve (14) away from the limiting groove (9). A limiting hole (1301) matching the shape of the limiting block (18) is opened on the outer wall of the card block (13).

7. The CT test phantom connection structure according to claim 1, characterized in that: The rotating sleeve (10) is composed of eight arc-shaped pieces (1001) arranged in a ring array. The inner wall of the rotating sleeve (10) is in contact with the outer wall of the rotating ball (11). There are gaps between the eight arc-shaped pieces (1001). Anti-slip pads are glued to the inner sidewalls of the arc-shaped pieces (1001). External threads are provided on the outer sidewalls of the arc-shaped pieces (1001). The annular fastening sleeve (12) adopts a truncated cone structure with a smaller upper part and a larger lower part. The inner hole of the annular fastening sleeve (12) is provided with a trapezoidal internal thread that matches the external thread of the arc-shaped pieces (1001). The rotating sleeve (10) is threadedly connected to the annular fastening sleeve (12) through the external thread.

8. The CT test phantom connection structure according to claim 6, characterized in that: The adjusting member (15) has a vertically formed hinge groove (1503) in the center, and the end of the connecting rod (16) is inserted into the hinge groove (1503) and hinged to the hinge groove (1503). The end of the adjusting member (15) near the sleeve (14) is vertical and fits against the sleeve (14). The top of the adjusting member (15) is horizontal, and an arc-shaped transition part (1501) is provided at the angle between the horizontal end and the vertical surface. The bottom of the adjusting member (15) extends downward to form a pinch part (1502). When the adjusting member (15) changes from vertical to horizontal, the limiting block (18) and the limiting hole (1301) are completely separated.

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