目的 :探讨原发性肝癌的电子束CT增强特征。材料和方法 :3 2例原发性肝癌行 3 5例次平扫和双期或三期增强扫描。肝动脉期扫描时间约为 2 0～ 2 5s ,门静脉期约为 40～ 5 0s ,平衡期扫描延长至 10 0s甚至 5～ 10min。把肝癌的增强分为 7种方式分析肿瘤增强特征。结果 :共检出 86个肿块和结节 ,动脉期能显示肿瘤的血管、动脉门静脉瘘、假包膜血供、门静脉癌栓。≤ 3 0cm结节动脉期 61%呈均匀高密度增强 ,13个表现为均匀或不均匀等密度 ,6个为低密度。门静脉期低密度肝癌结节 2 8个 (65 % ) ,均匀等密度结节 13个 ,少数表现为不均匀等密度和高密度。 >3 0cm肿块动脉期65 %表现为均匀或不均匀高密度 ,7个为不均匀等密度 ,6个为低密度。在门静脉期肿瘤主要表现为不均匀低密度 79%(2 7/3 4) ,5个表现为不均匀等密度 ,2个为均匀等密度 ,无 1例高密度。无论肿瘤大小平衡期呈等、低密度。结论 :EBCT显示肿瘤的血供特征以及门静脉累及 ,是肝癌和临床怀疑肝癌的重要检查技术 Objective: To investigate the enhanced characteristics of primary liver cancer by electron beam computed tomography. Materials and Methods: Twenty-five patients with primary liver cancer underwent plain scan and double or triple enhanced scanning. Hepatic arterial phase scan time is about 20 ~ 25s, portal vein period is about 40 ~ 5 0s, the balance of the scan extended to 10 0s or even 5 ~ 10min. The enhancement of liver cancer is divided into 7 ways to analyze the characteristics of tumor enhancement. Results: A total of 86 masses and nodules were detected. Arterial phase showed tumor vessels, arterial portal vein fistula, pseudocapsule blood supply and portal vein tumor thrombus. ≤ 3 0cm nodular artery phase was 61% uniform high density enhancement, 13 showed uniform or uneven density, 6 for the low density. Portal vein low-density liver cancer nodules 28 (65%), 13 uniform equal density nodules, a small number of heterogeneous and density showed high density. > 3 0cm Massive arterial phase 65% showed uniform or uneven high density, 7 non-uniform density, 6 low density. In the portal venous phase, the tumor mainly showed uneven low density of 79% (2 7/3 4), 5 showed inhomogeneous density, 2 uniform inhomogeneous density and none in 1 high density. No matter the tumor size balance period was equal, low density. Conclusion: EBCT showed that the blood supply characteristics of the tumor and portal vein involvement, is an important examination of liver cancer and clinical suspicion of liver cancer