Purpose: To study the principle of ultrasound imaging.
前言： 目的：研究超声回波成像的原理；
Objective To study the influence of IRR on imaging reading.
目的探讨阅片室内环境照度（IRR）对影像识读的影响。
Objective To study the diagnostic value of early cirrhosis by the Color Doppler Flow Imaging.
目的探讨早期肝硬化的彩色多普勒超声诊断价值。
AIM To study the diagnostic value of the imaging in the negative ureteral calculous.
目的探讨输尿管阴性结石的影象学诊断价值。
AIM To study the diagnostic value of the imaging in the negative ureteral calculous.
目的探讨输尿管阴性结石的影象学诊断价值。
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