磁共振增强动脉期及门静脉期成像在肝癌诊断中的价值

为评价磁共振(MR)动脉期和门脉期动态成像对肝癌的检测价值,运用快速扰向梯度回波技术对3 4例患者进行了MR动态成像.在静脉团注GD-DTPA的时间内连续采集,分别在动脉期与门脉期成像并与平扫SE-T1像、SE-T2像对肝癌的检测数目进行比较.结果显示64个得到证实的肝细胞癌(HCC)中,平扫SE-T1像发现56个(占88%)、SE-T2像发现54个(84%)、动脉期成像发现58个(90%)、门静脉期成像发现46个(72%).11个HCC仅在平扫SE列显示,8个HCC仅在动脉期得到确认,1个HCC仅在门静脉期得到确认.动态成像对非HCC肿瘤的检出率未增加.示动脉期和门静脉期动态成像能检测出某些SE平扫无法检出的HCC肿瘤,是对常规MR检查方法有力补充.

Hepatic Carcinomas: Value of Acquisition of Multiple Arterial and Portal Venous Phase Images at Dynamic Enhancement MR Imaging

To assess the value of examination by acquisition of multiple arterial and portal venous phase MR imaging in the diagnosis of hepatic carcinoma, dynamic MR imaging was performed in 34 patients by using a fast spoiled gradien echo technique. During intravenous bolus injection of GD DTPA multiple imaging was acquired. The number of tumors detected on arterial phase and portal venous phase images was evaluated and compared with un enhanced T1 and T2 weighted SE images. In the 64 hepatocellular carcinomas (HCCs), 48 (75 %) tumors were detected on un enhanced T1 weighted SE images, 46 (72 %) on un enhanced T2 weighted SE images, 54 (84 %) on arterial phase images and 44 (69 %) on portal venous phase images, respectively. Eight HCCs were detected only on arterial phase images, one only on portal venous phaseimage, and 11 only on un enhanced SE images. Detection of non HCC tumors did not increase by dynamic images. Acquisition of multiple dynamic arterial phase and portal venous phase images can detect some HCCs which cannot detect on conventional MR imaging and it is a complementary to routine MR imaging.