正常胰腺快速MR成像序列的比较研究

A Comparative Study of Fast MRI Sequences in Normal Pancreas

目的选择最适当的胰腺快速ＭＲ成像序列。材料与方法对２０例胰腺正常者行六种快速ＭＲ成像序列检查，其中包括四种快速自旋回波序列（ＴＳＥ—Ｔ１ＷＩ、Ｔ１ＦＳ、Ｔ２ＷＩ、Ｔ２ＦＳ）和二种梯度回波序列（ＧＲＥ—ＴＦＥ、ＦＦＥ），然后对所得图像进行定量、定性分析。结果定量分析表明，Ｔ１ＦＳ有最高的胰腺信噪比。定性分析表明，Ｔ１ＷＩ显示脾静脉最好，且能同时清楚显示肠系膜上血管、门静脉和腹腔动脉。Ｔ１ＦＳ的伪影最少，且能同时清楚显示胰——十二指肠分界、胰一胃分界及肠系膜上静脉。Ｔ２ＷＩ的图像质量及对胰一十二指肠分界显示最好，且能同时清楚显示胆总管、肠系膜上血管、门静脉和腹腔动脉。Ｔ２ＦＳ显示胆总管最好，显示胰一十二指肠分界的能力同Ｔ２ＷＩ，同时能清楚显示门静脉。ＴＦＥ和ＦＦＥ无明显的优点。六个序列中任何一个，均不能使正常胰管成像。结论在正常胰腺快速ＭＲ成像序列中，Ｔ１ＦＳ和Ｔ２ＷＩ优于其它序列。

Purpose To Select the most suitable MRI sequence for pancreas. Materials and methods Six sequences including 4 fast spin echo sequences (TSE -T1 WI. T1 FS. T2 WI. T2 FS ) and 2 gradient echo sequences (GRE - TFE.FFE ) were used in 20 cases with normal pancreas. The images from these sequences were analysed quantitatively and qualitatively. Results Quantitative analysis showed that the T1FS had the highest pancreatic SNR. Qualitative analysis showed that the T1WI was the best sequence for demonstrating the splenic vein and could clearly show the superior mesenteric vessels .the portal vein and the coeliac artery. The T,FS had the least artifact and could clearly show the boundary between the pancreas and duodenum. the boundary between the pancreas and stomach as well as the superior mesenteric vein. The quality of images and the demonstration of the boundary between the pancreas and duodenum were the best in T,WI. The common binary duct.the superior mesenteric vessels .the portal vein and the coeliac artery could be clearly shown in the T2WI at the same time. The T2FS was the best sequence for demonstrating the common binary duct and it's ability to demonstrate the boundary between the pancreas and duodenum was the same as T2WI's. T2WI could also clearly show the portal vein. No obvious advantage was found in the TFE and FFE. None of the six sequences mentioned above could show the normal pancreatic duct. Conclusion The T1FS and T2WI were superior to other fast MRI sequences for normal pancreas.