Disassembling C type arm alignment target

Abstract

A detachable C shape arm alignment target in medical engineering field comprising a template assembly, a body frame and a weight balance member, wherein the template assembly consists of a template body employing steel balls to occlude the precision blind holes on an organic glass plate and a hoop frame for connecting the template and the main frame, the body frame is designed as a hollow cylinder structure, on the upper, lower and external surface of which infrared reflective beads are arranged according to NDI independent tool design rule. The alignment template assembly and assembled body frame can not only be used for on-line alignment but also for off-line alignment system initialization period, the weight balance member and the assembled body frame may be used in usage period of off-line alignment. The body frame and the hoop frame blank are forged by aluminium material, the body frame, hoop frame refined-machining, template and other parts employs digital control equipment for processing. The novel alignment target has low cost, high accuracy and dual purposes.

Description

technical field [0001] The invention relates to a device in the technical field of medical engineering, in particular to a detachable C-arm calibration target. Background technique [0002] There are many types of computer-aided surgical navigation systems in the field of clinical medical engineering, and the navigation system based on C-arm X-ray fluoroscopy images is one of them. The C-arm calibration target is a necessary tool for the navigation system to realize the functions of C-arm position tracking, image deformation correction and C-arm camera calibration, and these three functions are the key technologies of this type of surgical navigation system. The design of the calibration target The pros and cons not only directly affect the production cost of the target itself, but also affect the accuracy of the entire surgical navigation system. [0003] Calibration targets vary by calibration protocol. The navigation system can adopt two schemes of online calibration an...

AI Technical Summary

Problems solved by technology

The existing C-arm calibration target has high manufacturing cost and low navigation accuracy

[0004] Find through literature search to prior art, " Fluoroscopy asan Imaging Means for Computer Assisted Surgical Navigation " (with fluorescence image) that R.Hofstetter etc. published on " Computer aided surgery " (Computer Aided Surgery, 1999, 4 volumes 65-76) As an image carrier for computer-aided surgical navigation), this paper proposes that only one layer of calibration templates are placed at different positions at the front end of the C-arm image intensifier to replace the complete calibration target to achieve the calibration function. The reason is that only offline calibration can be used, and the operation steps are cumbersome. The two positions of the calibration template are manually placed, and the accuracy is difficult to guarantee.

Also found in the retrieval, "A novel approach for distortioncorrection for X-ray image intensifiers" (a kind of Novel X-ray image image intensifier deformation correction method), this paper proposes a calibration target containing only one layer of grooved aluminum template for the deformation correction of X-ray images, the disadvantage is that it can only realize the deformation correction function, The realization of the C-arm camera calibration function also depends on another complex set of targets specially used for calibration. The original sequentially connected deformation correction function and camera calibration function are forcibly separated. The operation process is cumbersome, and the overall navigation accuracy is affected by two factors. Target body processing and installation accuracy have a great influence

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