Comparison of American College of Radiology and Kwak Thyroid Imaging Reporting and Data System / 中国医学影像学杂志

ABSTRACT

Purpose To compare the diagnostic value of thyroid imaging reporting and data system (TI-RADS) made out by American College of Radiology (ACR TI-RADS) and Kwak (Kwak TI-RADS) on thyroid nodules.Materials and Methods Clinical data and preoperative ultrasound images of 920 patients with thyroid nodules (in total 1130 nodules) were retrospectively analyzed.The nodules were classified according to two TI-RADS standards and performance curves of the subjects were constructed with surgical pathological results as golden standards.Diagnostic value of two TI-RADS on thyroid nodules was analyzed and diagnostic efficiency was compared.Results For the 1130 thyroid nodules,malignant rate for 1-5 category patients classified by ACR TI-RADS was 0,0,8.4％,50.9％ and 88.4％,respectively;and that for 2-5 category patients (2,3,4a,4b,4c,5) classified by Kwak TI-RADS was 0,1.2％,9.1％,50.0％,87.8％ and 89.5％,respectively.Susceptibility,specificity,positive predictive value (PPV) negative predictive value (NPV) accuracy and area under curve (AUC) of benign and malignant thyroid nodules diagnosed by Kwak TI-RADS were 95.7％,77.9％,75.5％,96.3％,85.3％ and 0.925,respectively.Susceptibility,specificity,PPV,NPV,accuracy and AUC of benign and malignant thyroid nodules diagnosed by ACR TI-RADS were 97.0％,73.2％,72.0％,97.2％,83.1％ and 0.918,respectively.A statistical difference in specificity was shown between ACR TI-RADS and Kwak TI-RADS (P＜0.05).but no statistical difference in susceptibility,PPV,NPV,acuracy or AUC was found between the two groups (P＞0.05).Conclusion The two TI-RADS were of quite high value in diagnosing benign and malignant thyroid nodules.Kwak TI-RADS was of higher specificity compared with ACR TI-RADS.