Automatic analysis method for shape of deformed long bone

Abstract

The invention discloses an automatic analysis method for the shape of a deformed long bone, and the method comprises the steps: firstly training a thighbone detector, a shape model and a local model according to a thighbone X-ray film set; detecting the position and the size of the femur in the X-ray film through a trained detector; taking the position and the size as initial values of the trainedshape model, and fitting the thighbone contour; and finally, according to the positions of all the feature points after fitting, drawing anatomical axes of all bone segments of the femur, joint walking lines and the like. When the method is applied to measurement, a result is almost consistent with a manual measurement result, and time consumption is superior to that of a traditional measurementmethod. When the analysis method is applied to automatic malformation analysis, image data can be utilized most effectively, image deformation is avoided, automatic line drawing, measurement and otherfunctions can eliminate line drawing errors, protractor errors, reading errors and other manual errors, and repeatability is good. The analysis method can meet the precision requirement of the orthopedics department, the burden of doctors can be remarkably relieved, and the working efficiency is improved.

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 and distal axes 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 axes. Using...

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.

Images