An automatic analysis method for deformed long bone shape

Abstract

The invention discloses an automatic analysis method for deformed long bone shape. In the analysis method, a femur detector, a shape model and a local model are trained according to a femur X-ray film set. The position and size of the femur in the X-ray film are detected by the trained detector. The position and size are used as the initial values ​​of the trained shape model to fit the femur contour. Finally, according to the position of each feature point after fitting, the anatomical axis of each bone segment of the femur and the joint line are drawn. When this method is used for measurement, it is almost consistent with manual measurement results, and the time-consuming is better than traditional measurement methods. Applying the analysis method of the present invention for automatic deformity analysis can make the most effective use of image data, avoid image deformation, automatic line drawing, measurement and other functions can eliminate manual errors such as line drawing errors, protractor errors, reading errors, etc., and the repeatability is good. The analysis method of the invention can meet the accuracy requirement of orthopedics, can significantly reduce the burden on doctors, and improve work efficiency.

Description

technical field [0001] The invention relates to the technical field of medical image processing, in particular to an automatic analysis method for deformed long bone shape. Background technique [0002] Taylor Spatial Frame (TSF) is one of the latest advances in the field of deformity correction. It utilizes the principle of Stewart platform and is a representative of hexapod robot external fixator. Correction of the deformity requires an osteotomy, which requires the determination of the center of rotation of angle (CORA)—the angle at which the proximal axis and the distal axis intersect. Analyzing the deformity on the X-ray film and drawing the anatomical axis of each bone segment is the primary task of deformity correction with Taylor space external fixator. The current method of deformity analysis is to place the X-ray film on the light box, use a crayon or a marker pencil to mark directly on the X-ray film, and then use a protractor to measure the angle between the axe...

AI Technical Summary

Problems solved by technology

Using this method is time-consuming and has a large error. The measurement accuracy is affected by many factors, such as the thickness of the pen tip, the measuring ruler, and the accuracy of the protractor, etc., which may lead to inaccurate marking of positioning points, inaccurate readings of measuring angles, and deviation of marking lines. Errors, etc.; In addition, reading errors may also occur due to human factors during the manual measurement process. Even experienced doctors may produce different results when they use the naked eye to judge the same X-ray film multiple times.

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