Static CT scanning frame laser lamp calibration device

Abstract

The utility model discloses a laser lamp calibration device of a static CT scanning frame. The laser lamp calibration device comprises a tool body. The tool body comprises a fixing plate and a calibration plate, and the fixing plate is perpendicularly connected with the calibration plate. The calibration plate comprises a first alignment groove and a second alignment groove, and the second alignment groove and the first alignment groove are vertically crossed; the fixing plate is used for fixing the calibration plate to the scanning frame, so that the first alignment grooves are parallel to a rotating shaft of the scanning frame, and the plane where the two first alignment grooves in the tool body are located passes through the rotating shaft of the scanning frame. According to the utility model, through the integrated design of the fixing plate and the calibration plate, the problem of fixation of the calibration device on the scanning frame is solved, and the problem of laser calibration is also solved.

Description

Technical Field

[0001] The utility model relates to a static CT scanning frame laser light calibration device, belonging to the technical field of medical equipment. Background Art

[0002] The static CT system has a double-ring structure consisting of a detector array and a ray source array. The ray source array has dozens to hundreds of independent ray sources, and each ray source is exposed in sequence through sequential logic control. Therefore, mechanical rotation is not required when implementing CT scanning. It has systematic advantages such as fast scanning speed, high spatial resolution, high temporal resolution, multi-level energy spectrum, and low dose.

[0003] In a static CT system, the laser light of the CT machine scanning frame can assist the positioning system to position more accurately and ensure that the edge of the irradiation field is accurately outlined. During the CT scanning process, this precise positioning is essential for obtaining high-quality images and accurate diagnosis. Therefore, people have high requirements for the calibration of the laser light of the CT machine scanning frame, mainly including: 1) High precision requirements: The laser light calibration needs to achieve extremely high precision, because any slight deviation may affect the accuracy and image quality of the CT scan. This requires that the tools and equipment used in the calibration process must be very precise, and the operation must also be very careful and accurate; 2) Stability requirements: During the CT scanning process, the scanning frame needs to remain stable, otherwise it will affect the calibration effect of the laser light. Therefore, during the calibration process, it is necessary to ensure the stability and fixity of the scanning frame to avoid any possible vibration or movement.

[0004] At present, the calibration of laser light fixtures is usually carried out using water models. However, due to the material of the water model, the laser will be refracted during the adjustment process, which makes the adjustment produce inevitable errors. In order to avoid such errors, the size of the water model must be strictly controlled during the processing, which leads to an increase in processing costs and difficulties. At the same time, as an auxiliary device, the volume of the water model and the water model fixing bracket is relatively large, which is not convenient for after-sales maintenance personnel to carry. In addition, the water model is fragile and afraid of falling, which is not convenient for maintenance and management. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a static CT scanning frame laser light calibration device (referred to as calibration device for short).

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical solutions:

[0007] A static CT scanning frame laser light calibration device, comprising a tooling body; wherein,

[0008] The tooling body comprises a fixing plate and a calibration plate, wherein the fixing plate is vertically connected to the calibration plate;

[0009] The calibration plate comprises a first pair of wire grooves and a second pair of wire grooves, and the second pair of wire grooves are arranged perpendicularly and crosswise with the first pair of wire grooves;

[0010] The fixing plate is used to fix the calibration plate to the scanning frame, so that the first pair of line grooves are parallel to the rotation axis of the scanning frame, and the plane where the two first pairs of line grooves in the tooling body are located passes through the rotation axis of the scanning frame.

[0011] Preferably, the first pair of wire grooves are arranged along the length direction of the calibration plate and are parallel to the rotation axis in the installed state;

[0012] The second pair of wire grooves is arranged at an end away from the fixing plate.

[0013] Preferably, two symmetrical wiring holes are respectively provided on the first pair of wiring slots and the second pair of wiring slots.

[0014] Preferably, the fixing plate is provided with screw holes.

[0015] Preferably, the tool body further comprises a hand-tightened anti-slip nut, and the hand-tightened anti-slip nut comprises a screw head, a small-diameter screw rod and screw threads;

[0016] The small-diameter screw rod is matched with the screw hole, the screw head is fixed outside the scanning frame, and the screw thread is inside the scanning frame.

[0017] Preferably, the sum of the lengths of the small-diameter screw and the thread is greater than the thickness of the fixing plate.

[0018] Preferably, the screw hole comprises a large-diameter portion and a small-diameter portion; wherein the diameter of the large-diameter portion is larger than that of the small-diameter portion, and the length of the large-diameter portion is larger than the length of the screw thread;

[0019] The diameter of the small-diameter portion is the same as that of the small-diameter screw;

[0020] The large aperture portion is arranged at an end close to the scanning frame; the small aperture portion is arranged at an end far away from the scanning frame.

[0021] Preferably, the diameter of the screw thread is smaller than the diameter of the large-diameter portion and larger than the diameter of the small-diameter portion.

[0022] Preferably, the fixing plate and the calibration plate are an integrated structure.

[0023] Preferably, the tool body is made of aluminum alloy or stainless steel.

[0024] Compared with the prior art, the utility model has the following technical effects: by adopting the integrated design of the fixing plate and the calibration plate, the problem of fixing the calibration device on the scanning frame and the problem of laser calibration are solved. At the same time, the anti-slip design on the fixing plate makes the connection between the tooling body and the CT scanning frame more stable and firm. The device has a simple structure and is easy to install, which is convenient for after-sales personnel to carry and manage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the upper and lower calibration structure of a static CT scanning frame laser light calibration device provided by an embodiment of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the left and right calibration structure of the static CT scanning frame laser light calibration device;

[0027] Figure 3 for Figure 1 A schematic diagram of the tooling structure of the static CT scanner laser light calibration device;

[0028] Figure 4 for Figure 3 A partial enlarged view of the static CT scanner laser light calibration device. DETAILED DESCRIPTION

[0029] The technical content of the present utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 and Figure 2 As shown, the embodiment of the utility model discloses a static CT scanning frame laser light calibration device, including a tooling body 1 installed on a CT machine scanning frame 100 and a hand-tightened anti-slip nut 1A.

[0031] like Figure 3 As shown, the tool body 1 is a bending plate, including a fixing plate 2 and a calibration plate 3. The fixing plate 2 and the calibration plate 3 are an integrated structure to ensure relative accuracy, and are made of aluminum alloy, stainless steel and other materials with predetermined hardness and flatness to meet high-precision laser calibration.

[0032] One end of the fixed plate 2 is connected to the calibration plate 3; at the end away from the calibration plate 3, a positioning hole 4 and a screw hole 5 are provided for fixing the tool body 1 on the scanning frame 100. It should be noted that the positioning pin used in the positioning hole 4 is an interference fit with the tool body 1, which positions the fixed plate 2 on the scanning frame 100 and can effectively avoid the phenomenon of pin loss. The nut used in conjunction with the screw hole 5 is a hand-tightened anti-slip nut 1A, which is easy to install. The screw hole 5 includes a large aperture portion 51 and a small aperture portion 53, the diameter of the large aperture portion 51 is larger than the small aperture portion 53, and the diameter of the small aperture portion 53 is the same as the diameter of the small-diameter screw 11A. The large aperture portion 51 is arranged at one end close to the scanning frame 100, and the length is d. The diameter of the small aperture portion 53 is smaller than the diameter of the screw thread 12A, which can effectively prevent the hand-tightened anti-slip nut 1A from slipping.

[0033] like Figure 4 As shown, the hand-tightened anti-slip nut 1A includes a screw head 10A, a small-diameter screw rod 11A and a screw thread 12A. The length of the screw thread 12A is a, and the length of the small-diameter screw rod 11A is b. The sum of the lengths of the small-diameter screw rod 11A and the screw thread 12A (a+b) is greater than the thickness c of the fixing plate 2, so that the screw thread 12A is screwed into the inner thread of the scanning frame 100 by at least 5 times the pitch, so as to ensure the stability of the connection between the tooling body 1 and the scanning frame 100.

[0034] The screw head 10A, the small-diameter screw rod 11A and the screw thread 12A are connected in sequence, and the hand-tightened anti-slip nut 1A can be tightened and loosened by rotating the screw head 10A. The screw thread 12A is located at the top of the hand-tightened anti-slip nut, and its length a is less than the length d of the large aperture portion; the diameter of the screw thread 12A is less than the diameter of the large aperture portion 51, and greater than the diameter of the small aperture portion 53, so that the hand-tightened anti-slip nut 1A can pass through the fixing plate 2 and be screwed into the interior of the scanning frame 100, so as to stably fix the tool body 1 on the scanning frame 100. Specifically, when the hand-tightened anti-slip nut 1A is in a tightened state, the screw thread 12A is tightly engaged with the interior of the scanning frame 100, and the tool body 1 is firmly positioned on the scanning frame 100. When the hand-tightened anti-slip nut 1A is in a loosened state, the screw thread 12A enters the large aperture portion 51 (the large aperture cavity shown in d in the figure). Since the diameter of the small-diameter portion 53 is smaller than the thread 12A, the hand-tightened anti-dropout nut 1A cannot drop out of the screw hole 5 without the action of external force.

[0035] One end of the calibration plate 3 is vertically connected to the fixed plate 2 so that the calibration plate 3 is directed from the fixed plate 2 toward the rotation axis (the gantry scanning rotation center) of the CT machine. Figure 1 and Figure 2 As shown, the calibration plates 3 of the two opposite tooling bodies 1 mounted on the scanning frame of the CT machine are parallel to each other. In other words, the length direction of the calibration plate 3 in this state is parallel to the Z direction of the CT machine (the direction perpendicular to the scanning rotation plane of the CT machine, also called the "rotation axis").

[0036] The calibration plate 3 is provided with a first pair of wire grooves 6, a second pair of wire grooves 7, and a wire hole 8, all of which penetrate the calibration plate 3. The first pair of wire grooves 6 is arranged in the middle of the calibration plate 3 along the length direction of the calibration plate 3. The second pair of wire grooves 7 is arranged at one end away from the fixed plate 2, and is arranged vertically cross-shaped with the first pair of wire grooves 6 to form a cross intersection. Moreover, in the installed state (the calibration plate 3 is installed on the scanning frame), the first pair of wire grooves 6 is parallel to the Z direction. In other words, the fixed plate is used to fix the calibration plate to the scanning frame, so that the first pair of wire grooves are parallel to the rotation axis of the scanning frame, and the plane where the two first pairs of wire grooves in the tooling body are located contains the rotation axis of the scanning frame.

[0037] With the cross point as the center, a pair of alignment holes 8 are symmetrically arranged on the first pair of line grooves 6 with respect to the second pair of line grooves 7. A pair of alignment holes 8 are symmetrically arranged on the second pair of line grooves 7 with respect to the first pair of line grooves 6. Therefore, the incident beam of the laser passes through the first pair of line grooves 6 and the second pair of line grooves 7 to form a linear projection beam; the incident beam of the laser passes through the four alignment holes 8 to form four point projection beams. With such a line and point design, the precise calibration of the straight laser light and the cross laser light can be simultaneously satisfied.

[0038] Specifically, when installing the tool body 1, first align the positioning holes 4 and screw holes 5 on the fixing plate 2 with the mounting holes on the scanning frame 100, and then fix the installation by means of positioning pins and hand-tightening anti-loosening nuts. After the tool body 1 is installed, the fixing plate 2 is fixedly connected to the side of the scanning frame 100, and the calibration plate 3 faces the center of the CT machine (the scanning rotation center of the frame). Figure 1 As shown, the tooling body 1 installed at the upper and lower ends of the scanning frame 100, when calibrating the upper cross laser light, first use a level ruler to adjust the calibration plate 3 horizontally to ensure that the plane of the calibration plate 3 is horizontal. When the light path of the cross laser light can simultaneously pass through the first pair of line grooves 6, the second pair of line grooves 7, and the four alignment holes of the upper and lower tooling bodies, the cross laser light on the upper side is in the calibration state. Similarly, if Figure 2 As shown, when calibrating the laser lights on the left and right sides, first rotate the scanning frame 100 90° to make the tooling bodies 1 on the left and right sides in a horizontal state. When the optical path of the laser lights on the left and right sides can simultaneously pass through the first pair of line grooves 6 on the calibration plates 3 on the left and right sides, the laser lights on the left and right sides are in a calibrated state.

[0039] In summary, the static CT scanner laser light calibration device provided by the embodiment of the utility model adopts an integrated design of a fixing plate and a calibration plate, which solves the problem of fixing the calibration device on the scanner and also solves the problem of laser calibration. At the same time, the anti-slip design on the fixing plate makes the connection between the tooling body and the CT scanner more stable and firm. The device has a simple structure and is easy to install, making it easy for after-sales personnel to carry and manage.

[0040] The above is a detailed description of the static CT scanning frame laser light calibration device provided by the utility model. For those skilled in the art, any obvious changes made to it without departing from the essence of the utility model will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A static CT scanner laser light calibration device, characterized in that It includes a tooling body; wherein, The tooling body comprises a fixing plate and a calibration plate, wherein the fixing plate is vertically connected to the calibration plate; The calibration plate comprises a first pair of wire grooves and a second pair of wire grooves, and the second pair of wire grooves are arranged perpendicularly and crosswise with the first pair of wire grooves; The fixing plate is used to fix the calibration plate to the scanning frame, so that the first pair of line grooves are parallel to the rotation axis of the scanning frame, and the plane where the two first pairs of line grooves in the tooling body are located passes through the rotation axis of the scanning frame.

2. The static CT scanning frame laser light calibration device according to claim 1, characterized in that: The first pair of wire grooves are arranged along the length direction of the calibration plate and are parallel to the rotation axis in the installed state; The second pair of wire grooves is arranged at an end away from the fixing plate.

3. The static CT scanning frame laser light calibration device according to claim 2, characterized in that: Two symmetrical wiring holes are respectively arranged on the first pair of wiring slots and the second pair of wiring slots.

4. The static CT scanning frame laser light calibration device as claimed in claim 2, characterized in that The fixing plate is provided with screw holes.

5. The static CT scanning frame laser light calibration device as claimed in claim 4, characterized in that It also includes a hand-tightened anti-stripping nut; The hand-tightened anti-slip nut comprises a screw head, a small-diameter screw rod and screw threads; the small-diameter screw rod cooperates with the screw hole, the screw head is fixed outside the scanning frame, and the screw threads are inside the scanning frame.

6. The static CT scanning frame laser light calibration device according to claim 5, characterized in that: The sum of the lengths of the small-diameter screw and the thread is greater than the thickness of the fixing plate.

7. The static CT scanning frame laser light calibration device according to claim 6, characterized in that: The screw hole comprises a large-diameter portion and a small-diameter portion; wherein the diameter of the large-diameter portion is larger than that of the small-diameter portion, and the length of the large-diameter portion is larger than the length of the screw thread; The diameter of the small-diameter portion is the same as that of the small-diameter screw; The large aperture portion is arranged at an end close to the scanning frame, and the small aperture portion is arranged at an end far from the scanning frame.

8. The static CT scanning frame laser light calibration device according to claim 7, characterized in that: The diameter of the screw thread is smaller than the diameter of the large-diameter portion and larger than the diameter of the small-diameter portion.

9. The static CT scanning frame laser light calibration device according to claim 8, characterized in that: The fixing plate and the calibration plate are an integrated structure.

10. The static CT scanning frame laser light calibration device according to claim 9, characterized in that: The tool body is made of aluminum alloy or stainless steel.

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