三维肝脏快速容积采集整合阵列空间敏感编码技术在肝脏动态增强扫描中的应用

目的 评价三维肝脏快速容积采集(3D-LAVA)整合阵列空间敏感编码技术(ASSET)在肝脏动态增强扫描中的应用价值. 方法 对147例患者行磁共振常规平扫,并对其中90例行3D-LAVA增强扫描(其中72例整合ASSET),57例行二维陕速扰相梯度回波(2D-FSPGR)增强扫描(其中20例行肝门静脉增强磁共振血管成像).比较3D-LAVA和2D-FSPGR对不同病灶的显示能力,以及3D-LAVA整合ASSET前后的采集时间.将60例3D-LAVA采集的原始图像进行最大密度投影处理后,与20例肝门静脉增强磁共振血管成像进行对比,分析其对肝门静脉血管解剖的显示.结果 3D-LAVA对转移性肝癌敏感性高于2D-FSPGR(P＜0.05).3D-LAVA整合ASSET后,34例实现动脉早期、动脉期采集,23例实现动脉早期、动脉期和动脉晚期采集.60例门静脉期原始图像经最大密度投影处理后,与增强磁共振血管成像对肝内门静脉分支显示基本一致(P＞0.05).结论 3DLAVA整合ASSET在肝脏动态扫描中,在较短时间内可获得高质量的多期增强图像并可同时提供血管解剖信息,具有很高应用价值.

The application of 3D liver acquisition volume acceleration integrated with array spatial sensitivity encoding technique in liver dynamic-enhancement scanning

OBJECTIVE: To evaluate the application of 3D liver acquisition volume acceleration (3D-LAVA) integrated with array spatial sensitivity encoding technique (ASSET) in liver dynamic-enhancement scanning. METHODS: One hundred forty-seven patients underwent conventional plain and contrast enhancement liver MR imaging. 3D-LAVA and 2D fast spoiled gradient recalled echo were used for contrast enhancement liver MR scanning in 90 and 57 patients respectively. In the 3D-LAVA group, integrated ASSET was used in 72 out of the 90 patients. Of the 57 patients who underwent examinations using 2D fast spoiled gradient recalled echo, portal vein CE-MRA was performed on 20. The ability of 3D-LAVA to detect the lesions and the advantage to shorten the acquisition time after integrating with ASSET were analyzed. Original images of 60 patients in the 3D-LAVA group were processed using MIP to illustrate the anatomy of the portal vein. They were compared with those shown by CE-MRA to evaluate the illustration abilities of the two approaches. RESULTS: 3D-LAVA is more sensitive than 2D-FSPGR in detecting metastatic hepatic carcinomas. In the 3D-LAVA group integrated with ASSET, earlier and peak arterial phase images were acquired in 34 cases; and earlier, peak and late arterial phase images were acquired in 23 cases. The illustrations of the portal vein anatomy by 3D-LAVA were similar to those shown by portal vein CE-MRA. CONCLUSION: 3D-LAVA integrated with ASSET can obtain higher quality multi-phase dynamic enhancement images of the liver in a shorter time, and in the meantime also shows the vascular anatomy.