Objective To evaluate the diagnosis evidence of malignant tumors in the parotid gland by using two -dimensional ultrasonography (2-d) and color Doppler flow imaging (CDFI).
目的：采用二维超声图像并结合彩色多谱勒血流显像探讨腮腺恶性肿瘤的超声诊断依据。
Methods 49 patients with venous valvular insufficiency were examined using 2-D color Doppler flow imaging to observe the anatomic structures of valves and hemodynamics of venous flow in legs.
方法应用二维彩色多普勒血流显像检查下肢静脉瓣功能不全49例，观察下肢静脉血管及瓣膜的解剖结构和血流动力学的改变。
Methods 49 patients with venous valvular insufficiency were examined using 2-D color Doppler flow imaging to observe the anatomic structures of valves and hemodynamics of venous flow in legs.
方法应用二维彩色多普勒血流显像检查下肢静脉瓣功能不全49例，观察下肢静脉血管及瓣膜的解剖结构和血流动力学的改变。
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