三维MRA技术在肝脏血管成像中的应用研究

目的：探讨三维增强MRA（3D CEMRA）技术在肝脏磁共振血管成像中的应用价值。方法：52例行肝脏磁共振血管成像患者及30例对照组病人，利用自动透视触发技术进行肝脏血管成像，造影剂到达降主动脉起始段时启动3D扫描，扫描时相包括肝动脉期、门静脉期及腔静脉期，分离各组图像并与蒙片剪影，再进行最大信号强度投影（MIP）及多平面图像重建（MPR），评价各期图像质量。结果：采用3DCEMRA技术所获肝动脉期及门静脉期图像质量满意；造影剂到达降主动脉起始段时间与造影剂流速、总量之间呈线性相关；造影剂总量和流速与肝血管信号强度呈正相关。结论：3DCEMRA技术可准确把握造影剂到达靶血管时间，结合最佳的造影剂总量和注射速度，明显提高肝脏磁共振血管成像质量。

Study of 3D CEMRA technique of hepatic vessels

Objective： To investigate the clinical value of 3D CEMRA of hepatic vessels. Methods： 3D CEMRA was performed in 82 cases. When contrast reached descending aorta, 3D scan started. Arterial phase, portal venous phase, vena cava phase were acquired. The images were subtracted and reconstructed by MIP or MPR. The quality of image was evaluated. Results： With this technique high quality of images were obtained. Contrast volume and flow rate correlated with the time when bolus reached the target vessel. Contrast volume and flow rate have linear correlation with the signal of hepatic vessel. Conclusion： 3D CEMRA technique can grasp the exact time when contrast reached target vessel. Combined with optimal contrast volume and injection rate can improve the image quality obviously.