Is Postcontrast trueFISP Imaging Advantageous?
Is Postcontrast trueFISP Imaging Advantageous?
复制标题
对比后真实FISP 成像有优势吗？
DOI：
10.1097/01.rli.0000131476.52176.44
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发表时间：
2004
影响因子：
6.7
通讯作者：
A. Buecker
中科院分区：
文献类型：
--
作者：
B. Jung;G. Krombach;R. Günther;A. Buecker
原理和目的：TrueFISP图像的对比度主要取决于T2/T1比值。因此，尽管T2加权较强，但顺磁性造影剂给药后信号强度可能会增加。本研究的目的是分析应用造影剂后腹部器官的信号强度，并确定与造影前TrueFISP相比，这是否会改善病理的对比度。材料和方法：50例患者接受了腹部检查，包括注射造影剂前后的TrueFISP序列。所有图像均使用1.5 T系统获得。评估腹部器官、血管、肌肉和脂肪造影剂前后的平均信噪比。计算病变的对比噪声比（CNR）。结果：在应用造影剂后，除了脂肪和主动脉外，所有器官的TrueFISP序列都产生了更高的信噪比。实性病变（血管平滑肌脂肪瘤、肝腺瘤、肝血管瘤、肝细胞癌）的CNR增加，而囊肿的对比度降低。结论：应用造影剂后的TrueFISP成像导致许多实性病变的CNR更好，而囊肿显示对比度降低。我们建议在应用造影剂前后使用TrueFISP成像序列。
Rationale and Objectives:Contrast of trueFISP images depends mainly on the T2/T1 ratio. Consequently, there is a potential gain in signal intensity after administration of paramagnetic contrast medium despite the strong T2 weighting. The purpose of this study was to analyze signal intensities of abdominal organs after applying contrast medium and to determine whether this yields an improved contrast for pathologies compared with precontrast trueFISP. Materials and Methods:Fifty patients underwent an abdominal examination, including the trueFISP sequence before and after the administration of contrast medium. All images were obtained with a 1.5 T system. The mean signal-to-noise ratio before and after contrast medium was assessed for abdominal organs, vessels, muscle, and fat. The contrast-to-noise ratio (CNR) of pathologic lesions was calculated. Results:The trueFISP sequence yielded a higher signal-to-noise ratio after application of contrast medium for all organs except for fat and the aorta. CNR of solid lesions (angiomyolipoma, liver adenoma, liver hemangioma, hepatocellular carcinoma) increased whereas contrast of cysts decreased. Conclusions:TrueFISP imaging after application of contrast medium led to better CNR for many solid lesions while cysts showed a diminished contrast. We advise trueFISP imaging sequences before and after contrast medium application.