肝脏局灶性病变MR动态增强扫描及临床意义

目的探讨肝脏局灶性病变ＭＲ动态增强扫描方法及临床意义。方法作者前瞻性研究了１３６例肝脏局灶性病变，包括肝细胞性肝癌、周围型肝内胆管细胞性肝癌、转移瘤及海绵状血管瘤。采用平静呼吸状态下梯度回波Ｋ空间中心部分采集技术、７个连续层面８个时相动态增强扫描。结果各例均动态增强扫描成功。动态扫描显示时间信号强度曲线在肝细胞性肝癌呈速升速降型；胆管细胞癌呈渐升型；转移瘤呈环形强化，缓慢升高型；海绵状血管瘤呈速升平台型。结论平静呼吸下Ｋ空间中心部分采集肝脏动态扫描，可以显示肝脏局灶病变的血供状态，而且不同病变具有不同的强化特征。

MRI dynamic scanning focal liver lesions: method and clinical significance

Purpose To evaluate dynamic contrast enhanced MR scanning in the diagnosis of focal liver lesions. Methods Focal liver lesions in 137 patients, including hepatocellular carcinoma (HCC), intrahepatic peripheral cholangiocarcinoma, metastasis, hemangioma and cyst, were prospectively studied. After SE T 1 weighted imaging and turbo SE T 2 weighted imaging at transverse section, dynamic scans with fast field echo sequence and central K space acquisition without breath hold were obtained at seven contiguous sections with eight phases. Results Dynamic scans were obtained successfully in all patients. Time intensity curves at dynamic scans presented fast up and down in HCCs, slow up in intrahepatic peripheral cholangiocarcinomas, slow up with ring enhancement in metastasis, fast up and keeping high level in hemangiomas and no enhancement in hepatic cysts. Conclusion Central K space acquisition without breath hold could be used to do dynamic scan of the liver. Various hepatic focal lesions had different enhancement patterns on the dynamic scans.