腹部磁共振成像的临床应用──探讨和比较几种扫描脉冲序列

笔者通过分析１００例腹部ＭＲＩ图像，研究和比较３对扫描脉冲序列的应用；研究结果表明：（１）Ｔ＿１加权像脉冲序列，快速ＳＰＧＲ（屏气）扫描速度快、呼吸伪影少、流动伪影多；而ＳＥ序列扫描时间长、流动伪影少、呼吸伪影多些；两者脉冲序列图像中解剖分辨和病变显示率相似（Ｐ＞０．０５，无显著差异）。（２）Ｔ＿２加权像脉冲序列，ＦＳＥ序列扫描时间短、呼吸伪影和流动伪影多；而ＳＥ序列扫描时间长、呼吸伪影和流动伪影少些；ＦＳＥ和ＳＥ图像中病变显示率相似（Ｐ＞０．０５，无显著差异）；ＳＥ图像中解剖分辨好于ＦｓＥ（Ｐ＜０．０１．有极显著差异）。（３）Ｔ＿２加权像加脂肪抑制序列图像中呼吸伪影、化学位移伪彤少，解剖分辨和病变显示清晰度均好于Ｔ＿２加权像不加脂肪抑制序列（Ｐ＜０．０ｌ，有极显著差异）。

Clinical Appication of Abdominal MR Imaging-Study and Comparison of several Pulse sequences

This article reported the application and comparison of three pulse sequences in ab-dominal MR naging of l00 cases,The results indicated that:(1) of the T_1-weighted sequences,FMPsPGR(breat-hold)had shorter imaging time,less respiratory motion artifact and more flow arti- fact,SE had longer imaging time,less flow artifact and more respiratory motion art ifact. Both se-quences were aimilar in demonstrating anatomic detail, and detection of lesions(P> 0. 05,statistically not significant).(2) Of the T_2-weighted sequences,FSE had shorter imaging time,much respiratory motion artifact and flow artifact.SE had longer imaging time,less respiratory motion and flow arti-facts,FSE and SE were similar in detection of lesions (P>0.05, statistically not significant).SE was superior to FSE in demonstrating anatomic detail (P< 0. 01, statistically very significant).(3)T_2-weighted with fat-suppression sequence had less respiratory-motion and chemical shift artifact,and was superior to T_2-weighted sequences without fat-suppression in showing anatomic detail and detec-tion of lesions (p<0. 0l , statistically very significant ).