目的：检测大肠癌患者的肝脏血流灌注指数(DPI)，探索大肠癌肝转移患者DPI变化的规律。

Objective: To investigate the variation of doppler Perfusion Index (DPI) in patients with liver metastases of colorectal carcinoma by color doppler sonography.

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目的：应用多普勒超声测定多普勒血流灌注指数（DPI）、阻力比（RR）等血流参数，用以评价其对肝癌术后复发患者的诊断价值。

Purpose:To assess the value of the DPI and RR measured with Doppler Ultrasound (DUS) in diagnosing recurrent primary hepatocellular carcinoma after partial hepatectomy.

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通过扫描软件得出肝血流量（BF）、血容量（BV）、对比剂平均通过时间（MTT）、渗透表面积乘积（PS）、肝动脉灌注指数（HAF）。

The liver perfusion parameters including hepatic blood flow(BF), blood volume(BV), mean transit time(MTT), permeability surface area product(PS) and hepatic arterial fraction (HAF)was calculated.

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