Objective To explore the value of virtual touch tissue quantification(VTQ) of acoustic radiation force impulse (ARFI) in the differential diagnosis between benign and malignant thyroid nodules. Methods The ultrasound (US), elastography imaging(EI), and VTQ of ARFI were performed to determine the characteristics and features of 63 thyroid nodules. The pathological diagnosis was the gold standard. According to the receiver operating characteristic curve (ROC) of US, EI, and VTQ, the critical points and diagnostic values of US, EI, and VTQ in diag-nosis of malignant thyroid nodules were achieved. Results Of the 63 nodules, 45 were benign and 18 were malignant. The area under curves of US, EI, and shear wave velocity(SWV) were 0.837(95% CI:0.712-0.962), 0.863(95% CI:0.751-0.974), and 0.900 (95% CI:0.810-0.990) respectively, and all the 3 kinds of technique had diagnostic value(P=0.001), but there were no significant difference among the 3 kinds of technique on the area under curve(P > 0.05). According to the receiver operating characteristic(ROC) curve, the critical point of US in distinguishing benign nodules with malignant nodules was 3 conventional ultrasonography, which displayed a sensitivity of 83.3%, a specificity of 86.7%, and a accuracy of 85.7%. The critical point of EI grades in distinguishing benign nodules with malignant nodules was gradeⅣ, which displayed a sensitivity of 94.1%, a specificity of 82.6%, and a accuracy of 87.3%. The critical value of SWV in distinguishing benign nodules with malignant nodules was 3.39 m/s, which displayed a sensiti-vity of 88.9%, a specificity of 91.1%, and a accuracy of 90.5%. Conclusion US, EI, and VTQ techniques all have diagnostic values in the differential diagnosis between benign and malignant thyroid nodules, and we should make combination with all of the 3 kinds of technique when performing differential diagnosis.
Objective To evaluate the clinical value of elasticity indicators in differential diagnosis of thyroid nodules. Methods Gray-scale ultrasound and elasticity imaging were used to examine 116 thyroid nodules. The rate of diameter change and ratio of area in the elasticity and gray-scale imaging were calculated and compared with pathology. Results In nodules of the ultrasonic elasticity grade 4 level and above, the proportion of malignant nodules was significanty higher than that of benign thyroid nodules （P＜0.05）. The malignant nodules was significanty higher than benign thyroid nodules in the rate of diameter change and ratio of area in the elasticity and gray-scale imaging （P＜0.05）. According to ROC analysis, the value of diagnosis and the diagnostic accuracy of the ratio of area was superior to that of the rate of diameter change （P＜0.05）. Conclusion As diagnostic indicators for differential diagnosis of thyroid nodules, the rate of diameter change and the ratio of area in elasticity can significantly improve the value of diagnosis and the accuracy of differential diagnosis level of thyroid nodules.