To investigate the value of color Doppler ultrasound in differentiation of benign and malignant solid superficial soft-tissue tumors using receiver operation characteristiccurve(ROC curve).
应用受试者工作特征曲线（ROC曲线）评价彩色超声判断实性浅表软组织肿物良恶性的价值。
2
The position of knee point of Phase-frequency characteristic mean valuecurve is invariant, but the kurtosis of the curve near the knee point decreases.
刚度与质量参数随机时相频特性均值曲线的拐点位置不变，只是拐点附近曲线陡峭度减小。
3
Objective to evaluate the value of diagnostic negative MDCT cholangiopancreatography in patients with suspected obstructive biliary diseases by receiver operating characteristic (ROC) curve.