A towline structure for SPECT and a SPECT device using the same

Abstract

The utility model relates to medical equipment technical field discloses a kind of tow chain structure for SPECT and the SPECT equipment using it, including dynamic ring, static ring, tow chain and counterweight, tow chain includes fixed section, movable section and U-shaped bending part, the opening of U-shaped bending part is set up obliquely upwards or positively upwards, U-shaped bending part is pulled tight downwards by counterweight, can effectively eliminate the slack and droop of tow chain due to its own gravity or inertia, ensure that tow chain always maintains certain tension, so that its movable section can be closely fitted in preset trajectory in the process of rotation, to solve the problem that tow chain is prone to slack, droop leads to unstable trajectory, significantly improve the stability and reliability of tow chain movement.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a drag chain structure for SPECT and a SPECT device using the same. Background Technology

[0002] SPECT (Single Photon Emission Tomography) equipment plays an important role in clinical diagnosis. Its core component—the detector—usually needs to be rotated to obtain multi-angle data. To ensure that the detector can stably obtain power and transmit signals during rotation, cable chains (or cable drag chains) are typically used to protect and manage the internal cables, allowing them to rotate synchronously with the detector and enabling orderly bending and stretching of the cables.

[0003] In SPECT equipment, one end of the cable chain typically needs to rotate synchronously with the rotating detector to ensure continuous power supply and data transmission for the cable during equipment operation. This requires the cable chain to maintain its structural integrity and trajectory stability during dynamic movement to meet the demands of high-precision, long-term operation. In existing technologies, the cable chain is usually placed directly on a support surface or constrained only by a simple guide structure.

[0004] However, existing cable chain structures often suffer from insufficient constraint when following the rotation of the rotating detector. When the equipment operates at high speed or for extended periods, the cable chain is prone to "slippage," meaning the moving parts fail to follow the preset trajectory. This causes the cable harness to become tangled or twisted inside or outside the chain, and may even damage the cable due to excessive bending or friction. This unstable movement not only increases the risk of equipment failure and shortens cable lifespan but also affects the scanning accuracy and operational reliability of the SPECT equipment, causing inconvenience for maintenance and operation. Utility Model Content

[0005] To address the aforementioned shortcomings, the purpose of this invention is to propose a cable chain structure for SPECT and a SPECT device using the same, thereby solving the problem of insufficient cable chain constraint in the prior art for SPECT.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A cable chain structure for SPECT includes a moving ring, a stationary ring, a cable chain, and a counterweight. The moving ring is mounted on the stationary ring, and the moving ring and the stationary ring are coaxially arranged, with the moving ring capable of rotating in place around its axis. The cable chain includes a fixed section, a movable section, and a U-shaped bend. The two ends of the U-shaped bend are respectively connected to one end of the fixed section and one end of the movable section. The other end of the fixed section is fixed to the stationary ring, and the other end of the movable section is connected to the moving ring. The movable section can slide circumferentially around the stationary ring. The opening of the U-shaped bend is inclined upward or facing upward. The counterweight includes a cylindrical shaft embedded in the U-shaped bend, with the axis of the shaft arranged along the width direction of the cable chain. The counterweight is used to pull the cable chain downward.

[0008] Preferably, the counterweight further includes two cover plates connected to the shaft body. The surface of the cover plate is perpendicular to the axial direction of the shaft body. The two cover plates are located on both sides of the cable chain width direction, and the projected area of ​​the cover plate along the axial direction of the shaft body is larger than that of the shaft body. The cover plates are used to limit the mutual positioning of the cable chain and the counterweight along the width direction of the cable chain.

[0009] Preferably, the device further includes a guide rail, which is fixed to the stationary ring. The guide rail has a T-shaped groove along its length. One end of the counterweight is embedded in the T-shaped groove of the guide rail. The length of the guide rail is arranged along the outer periphery of the stationary ring. The guide rail is used to guide the movement direction of the counterweight.

[0010] Preferably, the counterweight further includes a roller, which is rotatably fitted between the shaft and the cable chain.

[0011] Preferably, the counterweight further includes a roller, which is rotatably connected to one end of the shaft, and the shaft is embedded in the T-groove of the guide rail via the roller.

[0012] Preferably, it further includes a fixing bracket, which is fixed to the top of the guide rail, and the fixing section is fixed to the stationary ring through the fixing bracket.

[0013] Preferably, the guide rail includes an upper arc-shaped segment and a lower straight-edge segment. The length direction of the arc-shaped segment is arranged along the outer periphery of the stationary ring, and the length direction of the straight-edge segment is arranged in the vertical direction.

[0014] Preferably, a plurality of support rollers are provided on the outer periphery of the stationary ring, the support rollers are disposed between the stationary ring and the movable section, the axial direction of the support rollers is arranged along the axial direction of the stationary ring, and the plurality of support rollers are spaced apart circumferentially along the stationary ring.

[0015] Preferably, it further includes an arc-shaped baffle, which is disposed above the outer periphery of the stationary ring. The length direction of the arc-shaped baffle is arranged along the circumference of the stationary ring. The arc-shaped baffle is fixed to the end of the support roller shaft away from the moving ring. The surface of the arc-shaped baffle and the moving ring are arranged opposite to each other. The arc-shaped baffle and the moving ring are respectively disposed on both sides of the drag chain along its width direction. The arc-shaped baffle is used to cooperate with the moving ring to limit the drag chain along its width direction.

[0016] A SPECT device includes: a frame for supporting and positioning the entire device; one or more detectors for acquiring gamma-ray data from a patient; a patient examination table for supporting the patient and moving along the anterior ring axis; a data acquisition and processing system for receiving and processing signals acquired by the detectors; an image reconstruction system and a control system; and the aforementioned cable chain structure.

[0017] The technical solution provided by this utility model can include the following beneficial effects:

[0018] 1. By pulling the U-shaped bend downwards with counterweights, the slack and sagging of the cable chain caused by its own weight or inertia can be effectively eliminated, ensuring that the cable chain always maintains a certain tension. This allows the moving section to closely follow the preset trajectory during rotation, thereby solving the problem of cable chain slack and sagging leading to unstable trajectory and significantly improving the stability and reliability of cable chain movement.

[0019] 2. By using two cover plates to mutually limit the movement of the cable chain and the counterweight in the width direction, the problem of the cable chain potentially shifting along the width direction or separating from the counterweight shaft during movement is effectively solved. This ensures a stable connection between the cable chain and the counterweight, prevents the wiring harness from becoming tangled due to lateral displacement of the cable chain, and further enhances the reliability and safety of the cable chain system during dynamic operation.

[0020] 3. The guide rail design provides a clear movement path for the counterweight, effectively solving the problem of random swaying or deviation from the preset trajectory during movement. This not only ensures that the counterweight can slide smoothly and accurately along the outer circumference of the stationary ring, thereby precisely guiding the moving section of the cable chain, but also further improves the operational stability, reliability, and trajectory accuracy of the entire cable chain structure.

[0021] 4. The roller design changes the friction from sliding friction to rolling friction when the cable chain slides on the counterweight shaft. This significantly reduces the frictional resistance between the cable chain and the counterweight, effectively reducing wear on the cable chain and extending the service life of both the cable chain and cables. Simultaneously, the rolling friction also makes the cable chain move more smoothly, further improving the system's operational stability.

[0022] 5. The rollers change the friction from sliding friction to rolling friction as the counterweight moves on the guide rail, significantly reducing the frictional resistance between the counterweight and the guide rail, effectively reducing wear on both, and extending the service life of the components. Simultaneously, rolling friction makes the counterweight movement smoother and less strenuous, further improving the response speed and motion accuracy of the cable chain system. In one embodiment, two rollers are provided, connected to the shaft via a cover plate.

[0023] 6. The fixed bracket provides a reliable connection point for the fixed section of the cable chain, ensuring a stable connection between the fixed end of the cable chain and the stationary ring, effectively preventing the fixed end of the cable chain from loosening or shifting due to stress during equipment operation. Simultaneously, the fixing method that integrates with the top of the guide rail makes the entire cable chain system more compact and integrated, simplifying the installation process and improving the overall stability of the structure.

[0024] 7. The guide rail incorporates a combination of curved and straight edge sections, with the straight edge sections positioned vertically to significantly reduce frictional resistance as the counterweight slides along these sections under gravity. This makes the counterweight's descent and recovery smoother and more responsive, further optimizing the cable chain's tension and motion stability. It also helps the cable chain maintain an ideal bending radius and trajectory at different rotation angles. In specific embodiments, increasing the length of the straight edge section allows for a longer cable chain to achieve a larger rotation angle for the detector.

[0025] 8. The installation of several support rollers forms rolling support between the moving section of the cable chain and the stationary ring, effectively solving the problem of sliding friction and wear caused by direct contact between the moving section of the cable chain and the stationary ring during rotation. By converting sliding friction into rolling friction, the running resistance of the cable chain is significantly reduced, making the movement of the cable chain lighter and smoother, while extending the service life of the cable chain and the stationary ring, further improving the long-term reliability of the cable chain system.

[0026] 9. The arc-shaped baffle, in conjunction with the moving ring, forms a double limit in the width direction of the cable chain, effectively solving the problem of lateral swaying or deviation that may occur when the cable chain rotates at high speed or frequently. This bidirectional limiting mechanism ensures that the cable chain always operates stably within its preset width range, preventing the cable harness from becoming tangled or jammed due to lateral displacement of the cable chain, and greatly improving the operating accuracy and safety of the cable chain system. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of one embodiment of the present invention.

[0028] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0029] Figure 3A three-dimensional structural diagram of the counterweight block according to an embodiment of this utility model.

[0030] Figure 4 This is a partial cross-sectional view of one embodiment of the present invention.

[0031] Figure 5 This is a three-dimensional structural diagram of one embodiment of the present invention.

[0032] Among them: 1. Moving ring; 2. Stationary ring; 3. Cable chain; 31. Fixed section; 32. Moving section; 33. U-shaped bend; 331. Opening of U-shaped bend; 4. Counterweight; 41. Shaft; 42. Cover plate; 43. Roller; 44. Guide rail; 5. Arc-shaped section; 51. Straight edge section; 52. Fixed bracket; 6. Support roller shaft; 7. Arc-shaped baffle; 8. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 on this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0035] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The embodiments of this utility model are described below with reference to the accompanying drawings.

[0038] A cable chain structure for SPECT includes a moving ring 1, a stationary ring 2, a cable chain 3, and a counterweight 4. The moving ring 1 is mounted on the stationary ring 2, and the moving ring 1 and the stationary ring 2 are coaxially arranged, with the moving ring 1 capable of rotating in place around its axis. The cable chain 3 includes a fixed section 31, a movable section 32, and a U-shaped bend 33. The two ends of the U-shaped bend 33 are respectively connected to one end of the fixed section 31 and one end of the movable section 32, and the other end of the fixed section 31 is fixed. The other end of the movable segment 32 is connected to the moving ring 1, and the movable segment 32 can slide around the outer periphery of the stationary ring 2. The opening 331 of the U-shaped bend 33 is inclined upward or facing upward. The counterweight 4 includes a cylindrical shaft 41, which is embedded in the U-shaped bend 33. The axis of the shaft 41 is arranged along the width direction of the cable chain 3. The counterweight 4 is used to pull the cable chain 3 downward.

[0039] like Figure 1 and Figure 2 As shown, by pulling the U-shaped bend 33 downward by the counterweight 4, the slack and sagging of the cable chain 3 caused by its own weight or inertia can be effectively eliminated, ensuring that the cable chain 3 always maintains a certain tension, so that its moving section 32 can closely fit the preset trajectory during rotation, thereby solving the problem that the cable chain 3 is prone to slack and sagging, resulting in unstable trajectory, and significantly improving the stability and reliability of the cable chain 3's movement.

[0040] Preferably, the counterweight 4 further includes two cover plates 42, which are connected to the shaft 41. The surface of the cover plate 42 is perpendicular to the axial direction of the shaft 41. The two cover plates 42 are located on both sides of the cable chain 3 in the width direction, and the projected area of ​​the cover plate 42 along the axial direction of the shaft 41 is larger than that of the shaft 41. The cover plate 42 is used to limit the mutual positioning of the cable chain 3 and the counterweight 4 along the width direction of the cable chain 3.

[0041] like Figure 3 As shown, the two cover plates 42 mutually limit the drag chain 3 and the counterweight 4 in the width direction of the drag chain 3, effectively solving the problem that the drag chain 3 may deviate in the width direction or separate from the shaft 41 of the counterweight 4 during movement. This ensures the stable connection between the drag chain 3 and the counterweight 4, prevents the wire harness from becoming tangled due to the lateral displacement of the drag chain 3, and further enhances the reliability and safety of the drag chain 3 system in dynamic operation.

[0042] Preferably, it also includes a guide rail 5, which is fixed to the stationary ring 2. The guide rail 5 has a T-shaped groove along its length direction. One end of the counterweight 4 is embedded in the T-shaped groove of the guide rail 5. The length direction of the guide rail 5 is arranged along the outer periphery of the stationary ring 2. The guide rail 5 is used to guide the movement direction of the counterweight 4.

[0043] like Figure 4 As shown, the guide rail 5 provides a clear movement path for the counterweight 4, effectively solving the problem of the counterweight 4 swaying randomly or deviating from the preset trajectory during movement. This not only ensures that the counterweight 4 can slide smoothly and accurately along the outer circumference of the stationary ring 2, thereby accurately guiding the moving section 32 of the cable chain 3, but also further improves the operational stability, reliability, and trajectory accuracy of the entire cable chain structure.

[0044] Preferably, the counterweight 4 further includes a roller 43, which is rotatably fitted between the shaft 41 and the cable chain 3.

[0045] The roller 43 changes the friction from sliding friction to rolling friction when the cable chain 3 slides on the counterweight 4 shaft 41. This significantly reduces the frictional resistance between the cable chain 3 and the counterweight 4, effectively reducing wear on the cable chain 3 and extending the service life of both the cable chain 3 and the cable. Simultaneously, the rolling friction also makes the movement of the cable chain 3 smoother, further improving the system's operational stability.

[0046] Preferably, the counterweight 4 further includes a roller 44, which is rotatably connected to one end of the shaft 41, and the shaft 41 is embedded in the T-groove of the guide rail 5 through the roller 44.

[0047] The rollers 44 change the friction from sliding friction to rolling friction when the counterweight 4 moves on the guide rail 5, significantly reducing the frictional resistance between the counterweight 4 and the guide rail 5, effectively reducing wear on both the guide rail 5 and the counterweight 4, and extending the service life of the components. Simultaneously, the rolling friction also makes the movement of the counterweight 4 smoother and less strenuous, further improving the response speed and motion accuracy of the cable chain 3 system. In one embodiment, two rollers 44 are provided, and the two rollers 44 are connected to the shaft 41 via a cover plate 42.

[0048] Preferably, it also includes a fixing bracket 6, which is fixed to the top of the guide rail 5, and the fixing section 31 is fixed to the stationary ring 2 through the fixing bracket 6.

[0049] like Figure 5As shown, the fixed bracket 6 provides a reliable connection point for the fixed section 31 of the cable chain 3, ensuring a stable connection between the fixed end of the cable chain 3 and the stationary ring 2, effectively preventing the fixed end of the cable chain 3 from loosening or shifting due to stress during equipment operation. Simultaneously, the fixing method, which integrates with the top of the guide rail 5, makes the entire cable chain 3 system more compact and integrated, simplifying the installation process and improving the overall stability of the structure.

[0050] Preferably, the guide rail 5 includes an upper arc-shaped section 51 and a lower straight edge section 52. The length direction of the arc-shaped section 51 is arranged along the outer periphery of the stationary ring 2, and the length direction of the straight edge section 52 is arranged in the vertical direction.

[0051] The guide rail 5 comprises a combination of an arc-shaped section 51 and a straight-edge section 52. In particular, the straight-edge section 52 is positioned vertically, significantly reducing the frictional resistance of the counterweight 4 when sliding along the straight-edge section 52 under gravity. This makes the descent and retraction of the counterweight 4 smoother and more responsive, further optimizing the tension and stability of the cable chain 3, and helping the cable chain 3 maintain an ideal bending radius and trajectory at different rotation angles. In a specific embodiment, by increasing the length of the straight-edge section 52, a longer cable chain 3 can be used to achieve a larger rotation angle for the detector.

[0052] Preferably, a plurality of support rollers 7 are provided on the outer periphery of the stationary ring 2. The support rollers 7 are disposed between the stationary ring 2 and the movable section 32. The axial direction of the support rollers 7 is arranged along the axial direction of the stationary ring 2, and the plurality of support rollers 7 are spaced apart along the circumference of the stationary ring 2.

[0053] The arrangement of several support rollers 7 forms rolling support between the moving section 32 of the cable chain 3 and the stationary ring 2, effectively solving the problem of sliding friction and wear caused by direct contact between the moving section 32 of the cable chain 3 and the stationary ring 2 during rotation. By converting sliding friction into rolling friction, the running resistance of the cable chain 3 is significantly reduced, making the movement of the cable chain 3 lighter and smoother, while extending the service life of the cable chain 3 and the stationary ring 2, further improving the long-term reliability of the cable chain 3 system.

[0054] Preferably, it further includes an arc-shaped baffle 8, which is disposed above the outer periphery of the stationary ring 2. The length direction of the arc-shaped baffle 8 is arranged along the circumference of the stationary ring 2. The arc-shaped baffle 8 is fixed to the end of the support roller shaft 7 away from the moving ring. The plate surface of the arc-shaped baffle 8 is arranged opposite to the moving ring 1, and the arc-shaped baffle 8 and the moving ring 1 are respectively disposed on both sides of the drag chain 3 along its width direction. The arc-shaped baffle 8 is used to cooperate with the moving ring 1 to limit the drag chain 3 along its width direction.

[0055] The arc-shaped baffle 8 works in conjunction with the moving ring 1 to form a double limit in the width direction of the cable chain 3, effectively solving the problem of lateral swaying or deviation that may occur when the cable chain 3 rotates at high speed or frequently. This bidirectional limiting mechanism ensures that the cable chain 3 always operates stably within its preset width range, preventing the wire harness from becoming tangled or stuck due to lateral displacement of the cable chain 3, and greatly improving the operating accuracy and safety of the cable chain 3 system.

[0056] A SPECT device includes: a frame for supporting and positioning the entire device; one or more detectors for acquiring gamma-ray data from a patient; a patient examination table for supporting the patient and moving along the anterior ring axis; a data acquisition and processing system for receiving and processing signals acquired by the detectors; an image reconstruction system and a control system; and the aforementioned cable chain structure.

[0057] This new SPECT device significantly improves the stability, reliability, and safety of cable management, effectively avoiding cable tangling, wear, and malfunctions that are common in traditional cable chain systems. This ensures the stability and imaging quality of the SPECT device under long-term, high-intensity operation, reduces maintenance costs, and extends the equipment's lifespan.

[0058] Other configurations and operations according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0059] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A towline structure for SPECT, characterized by: The device includes a rotating ring, a stationary ring, a cable chain, and a counterweight. The rotating ring is mounted on the stationary ring, and the rotating ring and the stationary ring are coaxially arranged. The rotating ring can rotate in place around its axis. The cable chain includes a fixed section, a movable section, and a U-shaped bend. The two ends of the U-shaped bend are respectively connected to one end of the fixed section and one end of the movable section. The other end of the fixed section is fixed to the stationary ring, and the other end of the movable section is connected to the rotating ring. The movable section can slide circumferentially around the stationary ring. The opening of the U-shaped bend is inclined upward or facing upward. The counterweight includes a cylindrical shaft, which is embedded in the U-shaped bend. The axis of the shaft is arranged along the width direction of the cable chain. The counterweight is used to pull the cable chain downward.

2. A towed chain structure for SPECT according to claim 1, characterized in that: The counterweight also includes two cover plates connected to the shaft. The surface of the cover plate is perpendicular to the axial direction of the shaft. The two cover plates are located on both sides of the cable chain width direction, and the projected area of ​​the cover plate along the axial direction of the shaft is larger than that of the shaft. The cover plates are used to limit the mutual positioning of the cable chain and the counterweight along the width direction of the cable chain.

3. A towed chain structure for SPECT according to claim 1, characterized in that: It also includes a guide rail, which is fixed to the stationary ring. The guide rail has a T-shaped groove along its length. One end of the counterweight is embedded in the T-shaped groove of the guide rail. The length of the guide rail is arranged along the outer periphery of the stationary ring. The guide rail is used to guide the movement direction of the counterweight.

4. A cable chain structure for SPECT according to claim 3, characterized in that: The counterweight also includes a roller, which is rotatably fitted between the shaft and the cable chain.

5. A cable chain structure for SPECT according to claim 3, characterized in that: The counterweight also includes a roller, which is rotatably connected to one end of the shaft, and the shaft is embedded in the T-groove of the guide rail via the roller.

6. A cable chain structure for SPECT according to claim 3, characterized in that: It also includes a fixing bracket, which is fixed to the top of the guide rail, and the fixing section is fixed to the stationary ring through the fixing bracket.

7. A cable chain structure for SPECT according to claim 3, characterized in that: The guide rail includes an upper arc-shaped section and a lower straight-edge section. The length direction of the arc-shaped section is set along the outer circumference of the stationary ring, and the length direction of the straight-edge section is set along the vertical direction.

8. A cable chain structure for SPECT according to claim 1, characterized in that: A plurality of support rollers are provided on the outer periphery of the stationary ring. The support rollers are located between the stationary ring and the moving section. The axial direction of the support rollers is arranged along the axial direction of the stationary ring, and the plurality of support rollers are spaced apart along the circumference of the stationary ring.

9. A cable chain structure for SPECT according to claim 8, characterized in that: It also includes an arc-shaped baffle, which is disposed above the outer periphery of the stationary ring. The length direction of the arc-shaped baffle is arranged along the circumference of the stationary ring. The arc-shaped baffle is fixed to the end of the support roller shaft away from the moving ring. The plate surface of the arc-shaped baffle is arranged opposite to the moving ring, and the arc-shaped baffle and the moving ring are respectively disposed on both sides of the drag chain along its width direction. The arc-shaped baffle is used to cooperate with the moving ring to limit the drag chain along its width direction.

10. A SPECT device, characterized in that, include: The rack is used for overall support and positioning of the equipment; one or more detectors are used to collect gamma ray data from the patient's body. A patient examination bed for supporting the patient and moving along the static ring axis; a data acquisition and processing system for receiving and processing signals acquired by the detector; an image reconstruction system and a control system; and a drag chain structure as described in any one of claims 1-9.

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