胆囊结石化学类型的计算机辅助诊断

探讨胆囊结石化学类型与各影像学特征的关系，并建立简便而有效的体外预测结石化学类型的方法。

Computer Assisted Diagnosis for Chemical Type of Gallstone

Purpose: To study the relation between chemical types of gallstones and their X-ray features, and established the convenient, effective method for prediction the chemical types of gallstones. Materials and Methods: We collected prospectly 55 gallstone samples which X-ray examinations were complete before operation. The content of cholesterol, billirubin and calcium of gallstones were measured, and the relative analysis between the chemical types of gallstones and their X-ray features was done.Results:It was discovered that the calcification of gallstones, their buoyancy, shape, size, evenness of size,number, surface features and the sex of patients were closely related with their chemical type. In order to simplify the procedures and improve the accuracy, we used X1-X9 to replace the variables mentioned above, and characteristic values of X1-X9 were given. Based on the probability theory, the discriminant functions for identification of the cholesterol stones from noncholesterol stones were established by computer. Conclusion : The correct rate of the discriminant function to differentiate cholesterol gallstones from noncholesterol gallstones was 92.7%, mistaken rate 7.3%.