Device for calibrating C-arm parameters
By designing a device for calibrating C-arm parameters, and utilizing rotation angle limiting and torque limiting brackets, precise calibration of the distance and positional relationship between the C-arm X-ray source focal point and the detector plate was achieved, thereby improving the accuracy of CT and C-arm image registration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-03-27
AI Technical Summary
In the existing technology, the distance and positional relationship between the C-arm X-ray source focal point and the detector plate are not calibrated accurately, which affects the accuracy of CT and C-arm image registration.
A device including a flat plate calibration tool and a light source calibration tool was designed. The light source calibration tool can be rotated and locked at 0° and 180° positions by means of rotation angle limit and torque limit bracket. The C-arm parameters can be accurately calibrated by using steel ball hollow groove and optical positioning ball.
The accuracy of CT and C-arm image registration has been improved. The C-arm parameters are calibrated through the algorithm of the optical surgical navigation system, which enhances the accuracy of image registration.
Smart Images
Figure CN224039231U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical operation navigation system technical field, in particular to a device for calibrating C arm parameter. BACKGROUND
[0002] Medical diagnosis equipment based on X-ray radiation is called C-arm, C-arm equipment is more and more widely used in medical field, C-arm can move along guide rail around the part of patient to be checked or to be treated, can realize the purpose of checking all directions to patient inconvenient to move or move.C-arm X-ray device that the X-ray light source of one end of C-arm, X-ray detector or image intensifier and other mechanical structures of the other end opposite to C-arm are arranged constitutes is more and more widely used as diagnostic instrument.
[0003] In the use process, the distance and position relation of calibrating C arm X-ray light source focal point to detector flat plate is the necessary step in optical operation navigation operation, can improve the precision of subsequent CT and C arm image registration.
[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present utility model and should not be construed as acknowledging that this information is already known to those of ordinary skill in the art. SUMMARY
[0005] The utility model aims at providing a device for calibrating C arm parameter that can calibrate the distance and position relation of C arm X-ray light source focal point to detector flat plate.
[0006] To realize above-mentioned purpose, the utility model provides a device for calibrating C arm parameter, it is characterized by including: flat plate calibration tool, including first connecting piece and first calibration piece, first connecting piece sets up on first calibration piece, is used for connecting first calibration piece on the flat plate of C type arm, light source calibration tool includes second connecting piece and second calibration piece, second connecting piece one end rotatable with second calibration piece is connected, and the other end is connected with first calibration piece, second connecting piece is used for connecting second calibration piece on first calibration piece, second calibration piece includes first calibration board, second calibration board and two connecting boards of connecting first calibration board and second calibration board, first calibration board and second calibration board parallel arrangement.
[0007] In one or more embodiments, the second connecting piece comprises a rotation angle limiting support and a torque limiting support, the two connecting plates are symmetrically arranged on both sides of the second calibration piece, one end of the rotation angle limiting support is connected with one of the connecting plates, and the other end is connected with the first calibration piece, one end of the torque limiting support is connected with the other connecting plate, and the other end is connected with the first calibration piece, wherein the rotation angle limiting support has an angle limiting function, and can rotate the second calibration piece to 0° and 180°, and the torque limiting support has a torque retaining function, and can retain the second calibration piece at 0° and 180° positions.
[0008] In one or more embodiments, the first calibration plate is provided with a first square hollow groove, and a first steel ball is arranged on the side of the first calibration plate away from the second calibration plate and surrounds the edge of the first square hollow groove, the second calibration plate is provided with a second square hollow groove, and a second steel ball is arranged on the side of the second calibration plate away from the first calibration plate and surrounds the edge of the second square hollow groove, and the sizes of the first square hollow and the second square hollow are not equal.
[0009] In one or more embodiments, the first calibration piece is hollow at the top and is provided with a third square hollow groove at the bottom, the third square hollow groove is provided with a third steel ball arranged on the side of the bottom of the first calibration piece away from the second calibration piece and surrounding the edge of the third square hollow groove.
[0010] In one or more embodiments, the second connecting piece further comprises two locking pieces arranged at the positions where the rotation angle limiting support and the torque limiting support contact the first calibration piece, the bottom of the first calibration piece is provided with a nut and a locking sleeve corresponding to the locking pieces, and the nut and the locking sleeve can cooperate with the locking piece to fix the rotation angle limiting support and the torque limiting support at the bottom of the first calibration piece.
[0011] In one or more embodiments, one of the connecting plates is provided with a plurality of optical positioning balls arranged at the four corners of the connecting plate.
[0012] In one or more embodiments, the first connecting piece is two, the first connecting piece comprises a bandage and two bandage fixing pieces, the bandage fixing pieces are symmetrically arranged on both sides of the top of the first calibration piece, so that the bandage can vertically penetrate the top surface of the first calibration piece, and the two first connecting pieces are symmetrically arranged on the top of the first calibration piece.
[0013] In one or more embodiments, the first binding band fixing part bottom is provided with a locking knob.
[0014] The utility model provides a device for calibrating C arm parameter can be fixed on C arm panel, including the flat -pad calibration tool of bottom has the steel ball, and the light source calibration tool of double -deck structure, the light source calibration tool each layer is equipped with the square hollow of different side length around the square hollow and sets up the steel ball, the light source calibration mechanism can rotate and lock in 0 and 180 position, namely the position of two layers of steel ball is exchanged, through C arm to the light source calibration tool shoots X -ray image, and the image is sent to optical operation navigation system, calibrates C arm parameter through system algorithm, can improve the precision of CT and C arm image registration. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a structure schematic drawing of the device for calibrating C arm parameter provided in the utility model embodiment.
[0016] Figure 2 It is another angle structure schematic drawing of the device for calibrating C arm parameter provided in the utility model embodiment.
[0017] Figure 3 It is a structure schematic drawing of the flat -pad calibration tool of the device for calibrating C arm parameter provided in the utility model embodiment.
[0018] Figure 4 It is a structure schematic drawing of the light source calibration tool of the device for calibrating C arm parameter provided in the utility model embodiment.
[0019] Figure 5 It is a connecting structure schematic drawing of the device for calibrating C arm parameter provided in the utility model embodiment.
[0020] MAIN REFERENCE NUMERALS EXPLANATION:
[0021] 1-flat -pad calibration tool, 11-first connecting piece, 111-binding band, 112-binding band fixing part, 12-first calibration piece, 121-third square hollow groove, 122-third steel ball, 123-nut, 124-locking device cover, 13-locking knob, 2-light source calibration tool, 21-second connecting piece, 211-rotating angle limit support, 212-torque limit support, 213-locking piece, 22-second calibration piece, 221-first calibration plate, 2211-first square hollow groove, 2212-first steel ball, 222-second calibration plate, 2221-second square hollow groove, 2222-second steel ball, 223-connecting plate, 2231-optical positioning ball. DETAILED DESCRIPTION
[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.
[0023] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.
[0024] Example 1:
[0025] A device for calibrating C-arm parameters, such as Figures 1 to 5 As shown, it includes: a flat plate calibration tool 1, including a first connector 11 and a first calibration component 12, the first connector 11 being disposed on the first calibration component 12 for connecting the first calibration component 12 to the flat plate of the C-arm; and a light source calibration tool 2, including a second connector 21 and a second calibration component 22, one end of the second connector 21 being rotatably connected to the second calibration component 22 and the other end being connected to the first calibration component 12, the second connector 21 being used to connect the second calibration component 22 to the first calibration component 12, the second calibration component 22 including a first calibration plate 221, a second calibration plate 222, and two connecting plates 223 connecting the first calibration plate 221 and the second calibration plate 222, the first calibration plate 221 and the second calibration plate 222 being arranged in parallel.
[0026] Specifically, the flat plate calibration tool 1 is connected to the flat plate of the C-arm via a first connector 11. The top and bottom of the first calibration component 12 are open squares. In a preferred embodiment, the first calibration plate 221 and the second calibration plate 222 are two square plates of equal shape and arranged in parallel. The two connecting plates 223 are also square plates, symmetrically arranged at opposite ends of the first calibration plate 221 and the second calibration plate 222. The second calibration component 22 has a cuboid-like structure. The other two ends of the second calibration component 22 may or may not have connecting plates 223.
[0027] As an optional implementation, the second connecting piece 21 comprises a rotation angle limiting support 211 and a torque limiting support 212, two connecting plates 223 are symmetrically arranged on both sides of the second calibration piece 22, one end of the rotation angle limiting support 211 is connected with one of the connecting plates 223, and the other end is connected with the first calibration piece 12, one end of the torque limiting support 212 is connected with the other connecting plate 223, and the other end is connected with the first calibration piece 12, wherein the rotation angle limiting support 211 has an angle limiting function, which can rotate the second calibration piece 22 to 0° and 180°, and the torque limiting support 212 has a torque retaining function, which can keep the second calibration piece 22 at 0° and 180° positions.
[0028] Specifically, the 0° position and the 180° position mean that when a certain position is set as the 0° position of the first calibration plate 221 and the second calibration plate 222, the positions of the first calibration plate 221 and the second calibration plate 222 are exchanged when at the 180° position. As a preferred implementation, at the 0° and 180° positions, the first calibration plate 221 and the second calibration plate 222 are parallel to the bottom of the first calibration piece 12.
[0029] As an optional implementation, the first calibration plate 221 is provided with a first square hollow groove 2211 and a first steel ball 2212, the first steel ball 2212 is arranged on the side of the first calibration plate 221 away from the second calibration plate 222, and is arranged around the edge of the first square hollow groove 2211; the second calibration plate 222 is provided with a second square hollow groove 2221 and a second steel ball 2222, the second steel ball 2222 is arranged on the side of the second calibration plate 222 away from the first calibration plate 221, and is arranged around the edge of the second square hollow groove 2221, and the sizes of the first square hollow and the second square hollow are not equal.
[0030] Specifically, the first steel balls 2212 are a plurality of steel balls arranged at intervals on the outer edge of the first square hollow groove 2211, and the second steel balls 2222 are a plurality of steel balls arranged at intervals on the outer edge of the second square hollow groove 2221. In a preferred embodiment, the diameters and numbers of the first steel balls 2212 and the second steel balls 2222 are the same, but the intervals are different. The first calibration plate 221 and the second calibration plate 222 are respectively provided with hollow grooves of different sizes, and are surrounded by steel balls. When X-ray photography is used, the shapes surrounded by the first steel balls 2212 and the second steel balls 2222 can distinguish the differences between the first calibration plate 221 and the second calibration plate 222. When calibrating the C-arm, X-ray images are taken at 0° and 180° positions of the light source calibration tool 2, and the system algorithm of the optical surgical navigation system can calibrate the parameters of the C-arm.
[0031] As an optional embodiment, the first calibration piece 12 is hollow at the top and is provided with a third square hollow groove 121 at the bottom. The third square hollow groove is provided with third steel balls 122, which are arranged on the side of the bottom of the first calibration piece 12 away from the second calibration piece 22 and surround the edge of the third square hollow groove 121.
[0032] Specifically, the third steel balls 122 are a plurality of steel balls arranged at intervals on the outer edge of the third square hollow groove 121. The diameters, numbers and intervals of the first steel balls 2212, the second steel balls 2222 and the third steel balls 122 are determined by the algorithm of C-arm calibration.
[0033] As an optional embodiment, the second connecting piece 21 further comprises two locking pieces 213, which are respectively arranged at the positions where the rotation angle limiting support 211 and the torque limiting support 212 contact the first calibration piece 12. The bottom of the first calibration piece 12 is provided with nuts 123 and lockers 124 corresponding to the locking pieces 213. The nuts 123 and the lockers 124 can cooperate with the lockers to fix the rotation angle limiting support 211 and the torque limiting support 212 at the bottom of the first calibration piece 12.
[0034] Specifically, as a preferred embodiment, the rotation angle limiting support 211 and the torque limiting support 212 are provided with a connecting plate for accommodating the locking member 213 away from one side of the second calibration member 22, and the connecting plate is matched with the shape of the bottom of the first calibration member 12. The two locking members 213 are respectively arranged on the rotation angle limiting support 211 and the torque limiting support 212. The bottom of the first calibration member 12 is provided with two through holes for accommodating the locking member 213, and through the fixing of the nut 123, the locking member sleeve 124 and the locking member, the second calibration member 22 and the first calibration member 12 can be more stably connected.
[0035] As an optional embodiment, a plurality of optical positioning balls 2231 are arranged on one of the connecting plates 223, and the optical positioning balls 2231 are arranged on the four corners of the connecting plate 223.
[0036] Specifically, the two connecting plates 223 are rectangular plate structures, and the optical positioning balls 2231 are four and arranged on the four corners of the connecting plate 223. The optical positioning balls 2231 can facilitate the optical surgical navigation system to recognize the position and posture of the light source calibration tool 2.
[0037] As an optional embodiment, the first connecting member 11 is two, the first connecting member 11 includes a bandage 111 and two bandage fixing members 112, the bandage fixing members 112 are symmetrically arranged on both sides of the top of the first calibration member 12, so that the bandage 111 can vertically penetrate the top surface of the first calibration member 12, and the two first connecting members 11 are symmetrically arranged on the top of the first calibration member 12.
[0038] Specifically, the two first connecting members 11 symmetrically arranged on the top of the first calibration member 12 means that the top of the first calibration member 12 is a rectangle, the rectangle is an axisymmetric structure, and the two first connecting members 11 are symmetric according to one axis of symmetry of the rectangle. The rectangle has another axis of symmetry, and the two bandage fixing members 112 on one connecting member are symmetrically arranged about the other axis of symmetry.
[0039] As an optional embodiment, the bottom of the first bandage fixing member 112 is provided with a locking knob 13.
[0040] Specifically, the locking knob 13 is a bolt penetrating the first calibration member 12 from the outside. By rotating the locking knob 13, the connection between the knob and the flat plate can be further increased, that is, the locking knob 13 is used to assist the first connecting member 11 to fix the first calibration member 12 on the flat plate of the C-arm.
[0041] By adopting the above technical solution, this utility model provides a device for calibrating C-arm parameters, which can be fixed on the C-arm plate. It includes a plate calibration tool 1 with steel balls at the bottom and a double-layer light source calibration tool 2. Each layer of the light source calibration tool 2 has square cutouts with different side lengths and steel balls around the square cutouts. The light source calibration mechanism can rotate and lock at 0° and 180° positions, that is, the positions of the two layers of steel balls are exchanged. The C-arm takes X-ray images of the light source calibration tool 2 and sends the images to the optical surgical navigation system. The C-arm parameters are calibrated by the system algorithm, which can improve the accuracy of CT and C-arm image registration.
[0042] Example 2:
[0043] The present invention provides a device for calibrating C-arm parameters as follows:
[0044] S1. Install the flat panel calibration tool on the bottom of the flat panel detector;
[0045] S2. Fix the light source calibration tool to the bottom of the flat plate calibration tool;
[0046] S3. With the main body of the light source calibration tool facing upwards, take an X-ray image using the C-arm.
[0047] S4. Rotate the light source calibration tool so that the other flat surface faces upward, and then use the C-arm to take an X-ray image.
[0048] S5. The two images are sent to the optical surgical navigation system, and the C-arm parameters are calibrated by the system algorithm. These parameters are used for subsequent CT and C-arm image registration to improve the registration accuracy.
[0049] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.
Claims
1. An apparatus for calibrating C-arm parameters, characterized by, The utility model relates to a kind of calibration tools for C-arm, including: Flat panel calibration tool, including first connecting piece and first calibration piece, the first connecting piece is arranged on the first calibration piece, for connecting the first calibration piece on the flat panel of C-arm; Light source calibration tool, including second connecting piece, and second calibration piece, one end of the second connecting piece is rotatably connected with the second calibration piece, the other end is connected with the first calibration piece, the second connecting piece is used to connect the second calibration piece on the first calibration piece, the second calibration piece includes first calibration plate, second calibration plate, and two connecting plates connecting the first calibration plate and the second calibration plate, the first calibration plate and the second calibration plate are arranged in parallel.
2. A device for calibrating C-arm parameters as claimed in claim 1, characterized in that, The second connecting piece includes a rotation angle limiting support and a torque limiting support, the two connecting plates are symmetrically arranged on both sides of the second calibration piece, one end of the rotation angle limiting support is connected with one of the connecting plates, and the other end is connected with the first calibration piece, one end of the torque limiting support is connected with the other connecting plate, and the other end is connected with the first calibration piece, wherein the rotation angle limiting support has an angle limiting function, which can rotate the second calibration piece to 0° and 180°, and the torque limiting support has a torque retaining function, which can keep the second calibration piece at 0° and 180° positions.
3. A device for calibrating C-arm parameters as claimed in claim 2, characterized in that, The first calibration plate is provided with a first square hollow groove and a first steel ball, the first steel ball is arranged on the side of the first calibration plate away from the second calibration plate, and is arranged around the edge of the first square hollow groove; the second calibration plate is provided with a second square hollow groove and a second steel ball, the second steel ball is arranged on the side of the second calibration plate away from the first calibration plate, and is arranged around the edge of the second square hollow groove, the size of the first square hollow and the second square hollow is not equal.
4. A device for calibrating C-arm parameters as claimed in claim 1, wherein, The first calibration piece is hollow at the top and provided with a third square hollow groove at the bottom, the third square hollow groove is provided with a third steel ball, the third steel ball is arranged on the side of the bottom of the first calibration piece away from the second calibration piece, and is arranged around the edge of the third square hollow groove.
5. A device for calibrating C-arm parameters as claimed in claim 3, wherein, The second connecting piece further includes two locking pieces, the locking pieces are respectively arranged at the positions where the rotation angle limiting support and the torque limiting support contact the first calibration piece, the bottom of the first calibration piece is provided with a nut and a locking sleeve corresponding to the locking pieces, the nut and the locking sleeve can cooperate with the locking device to fix the rotation angle limiting support and the torque limiting support at the bottom of the first calibration piece.
6. A device for calibrating C-arm parameters as claimed in claim 1, wherein, A plurality of optical positioning balls are arranged on one of the connecting plates.
7. A device for calibrating C-arm parameters as claimed in claim 1, wherein, The first connecting piece includes two straps and two strap fixing pieces, the strap fixing pieces are symmetrically arranged on both sides of the top of the first calibration piece, so that the straps can vertically penetrate the top surface of the first calibration piece, and the two first connecting pieces are symmetrically arranged on the top of the first calibration piece.
8. A device for calibrating C-arm parameters as claimed in claim 7, characterized in that, The bottom of the strap fixing piece is provided with a locking knob.