摘要
目的 :探讨真实稳态进动快速成像T2 加权序列在胎儿MRI中的临床应用价值。材料和方法 :6例中、晚期孕程的孕妇行真实稳态进动快速成像 (trueFISP)T2 加权序列扫描 ,评价图像质量、模糊程度、正常胎儿器官显示、胎儿和母体异常的显示以及胎儿信噪比 (SNR)及胎儿 -孕妇腰椎椎体对比噪声比 (F -LCNR)等 ,并与TSE序列T2WI进行比较。结果 :与TSE序列T2WI相比 ,trueFISP序列T2 WI可清楚显示胎头、胎儿肢体、胎儿脊柱、胎儿的脏器解剖结构以及母体子宫、胎盘、脐带等附属结构 ,胎儿和母体异常显示也较清晰 ,并能清晰显示灰、白质分界、脑回、脑髓鞘等结构。trueFISP序列获得的图像其SNR以及F -LCNR均优于TSE序列。结论 :真实稳态进动快速成像T2 加权序列能够清晰显示胎儿及母体的解剖结构 ,获得的图像具有较高的T2对比 ,可作为胎儿MR成像的常用序列。
Purpose: To evaluate the application of true fast imaging with steady state precession T2* weighted imaging in fetus. Materials and Methods: Six women with complicated pregnancies were scanned with true FISP T2* weighted imaging in a 1.5T super-conductive MR imaging unit. Images were analyzed with regard to image quality, degree of blurring, visualization of the normal fetal organs, and visualization of fetal and maternal abnormalities. Signal-noise ratio (SNR) of fetus and fetus-maternal lumbar vertebra contrast-noise ratio (F-L CNR) were evaluated. The results were compared with those from Turbo-SE T2 weighted imaging. Results: On true FISP sequences, visualization of the fetal brain, visceral organs (lung, kidney, and bladder), extremities, and umbilical cord were significantly better than on turbo spin-echo sequences (P<0.05). Pathologic processes including fetal abnormalities, placenta and maternal abnormalities were clearly seen on true FISP imaging. In the brain, the white matter-gray matter distinction, gyrus formation, and myelination of the brain were clearly revealed by the true FISP sequence. SNR and F-A CNR of true FISP sequences were better than those of turbo spin-echo sequences. Conclusion: MR imaging with a true FISP sequence allows clear fetal imaging with high T2 weighted contrast, which can be used as a standard sequence of fetal MR imaging.
出处
《中国医学影像学杂志》
CSCD
2004年第4期272-275,共4页
Chinese Journal of Medical Imaging
关键词
真实稳态进动快速成像T2
加权序列
胎儿
MRI
孕妇
magnetic resonance imaging
fetus
true fast imaging with steady state precession
T2* weighted imaging
