多次激发回波平面成像用于改善心肌标记对比：与分段扰相梯度回波的比较
Multi-shot EPI for improvement of myocardial tag contrast: comparison with segmented SPGR.
作者信息
Tang C, McVeigh E R, Zerhouni E A
机构信息
Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
出版信息
Magn Reson Med. 1995 Mar;33(3):443-7. doi: 10.1002/mrm.1910330321.
Abstract
To assess the potential value of multi-shot EPI relative to segmented k-space SPGR for myocardial tagging, we measured tag contrast for both sequences in a phantom and human study and compared it with theoretical predictions. In the human heart, EPI tag contrast was three times that of SPGR at the end of systole. Tag duration was lengthened with EPI to at least 600 ms. In addition, the entire heart was examined in a total of 32 heartbeats with EPI versus 152 heartbeats with SPGR.
摘要
为了评估多次激发回波平面成像（multi-shot EPI）相对于分段 k 空间扰相梯度回波（SPGR）用于心肌标记的潜在价值，我们在体模和人体研究中测量了两种序列的标记对比度，并将其与理论预测值进行比较。在人体心脏中，收缩期末 EPI 的标记对比度是 SPGR 的三倍。使用 EPI 时标记持续时间延长至至少 600 毫秒。此外，使用 EPI 总共 32 次心跳即可检查整个心脏，而使用 SPGR 则需要 152 次心跳。
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