由于X线成像过程的复杂性和非线性，普通的减影方法并不能完全消除与血管重叠的其它组织的影像。
Because of the complexity and non_linearity of the X_ray imaging process, the common DSA technique cannot completely remove other tissue's image which lapped over the vessels.
原发性肝癌；动脉化疗栓塞术；血管数字减影(DSA)；影像学评价；肿瘤血供。
Primary liver cancer; Arterial chemoembolization (TACE); Digital subtraction angiography (DSA); Imaging Evaluation; Tumor blood supply.
目的探讨超声、CT、MRI和数字减影血管造影(dsa)等各种影像学检查在颈动脉海绵窦瘘(CCF)诊断中的价值。
Objective To evaluate the value of ultrasonography, ct, MRI and digital subtraction angiography (DSA) in the diagnosis of carotid cavernous fistula (CCF).
方法：回顾性分析了213例脑动脉瘤患者的二维、三维数字减影脑血管造影的影像学资料，并对其结果进行了对比分析。
Methods: Two-dimensional angiography and three-dimensional angiography were performed in 213 patients with intracranial aneurysm, the radiographic files were analyses retrospectively.
方法：回顾性分析了213例脑动脉瘤患者的二维、三维数字减影脑血管造影的影像学资料，并对其结果进行了对比分析。
Methods: Two-dimensional angiography and three-dimensional angiography were performed in 213 patients with intracranial aneurysm, the radiographic files were analyses retrospectively.
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