Three-dimensional breathhold SSFP coronary MRA: A comparison between 1.5T and 3.OT
Three-dimensional breathhold SSFP coronary MRA: A comparison between 1.5T and 3.OT
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DOI：
10.1002/jmri.20374
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发表时间：
2005-08-01
影响因子：
4.4
通讯作者：
Li, DB
中科院分区：
文献类型：
--
作者：
Bi, XM;Deshpande, V;Li, DB
目的：评价3.0T稳态自由旋进（SSFP）序列屏气三维冠状动脉磁共振血管成像（MRA）的可行性，并量化1.5T ~ 3.0T全身和相控阵心脏线圈接收信号时冠状动脉MRA的信噪比（SNR）和对比噪声比（CNR）增益。材料与方法：8名健康志愿者在1.5T和3.0T全身系统上使用SSFP序列进行扫描。对SSFP序列进行了数值模拟，以优化翻转角并预测从1.5T到3.0T的信号增强。冠状动脉图像，采集与全身线圈在发送-接收模式或发送只与相控阵心脏线圈receiver.Results：在同一志愿者组在两个场强在体内研究表明，增加了87%的SNR和83%的CNR从1.5T到3.0T使用全身线圈作为信号接收器。使用相控阵接收机的相应增加是53%的SNR和92%的CNR。然而，在3.0T的图像质量比1.5T的变化，增加磁敏感伪影和局部增亮的结果增加的B-0和131 inhomogeneity.Conclusion：在3.0T冠状动脉MRA使用三维屏气SSFP序列是可行的。在3.0T条件下改善的SNR保证了使用具有更快采集和/或更高空间分辨率的冠状动脉MRA。需要进一步研究以提高3.0T下图像质量和信号均匀性的一致性。
Purpose: To assess the feasibility of three-dimensional breathhold coronary magnetic resonance angiography (MRA) at 3.0T using the steady-state free precession (SSFP) sequence, and quantify the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) gains of coronary MRA from 1.5T to 3.0T using whole-body and phased-array cardiac coils as the signal receiver.Materials and Methods: Eight healthy volunteers were scanned on 1.5T and 3.0T whole-body systems using the SSFP sequence. Numerical simulations were performed for the SSFP sequence to optimize the flip angle and predict signal enhancement from 1.5T to 3.0T. Coronary artery images, were acquired with the whole-body coil in transmit-receive mode or transmit-only with phased-array cardiac coil receivers.Results: In vivo studies of the same volunteer group at both field strengths showed increases of 87% in SNR and 83% in CNR from 1.5T to 3.0T using a whole-body coil as the signal receiver. The corresponding increases using phased-array receivers were 53% in SNR and 92% in CNR. However, image quality at 3.0T was more variable than 1.5T, with increased susceptibility artifacts and local brightening as the result of increased B-0 and 131 inhomogeneities.Conclusion: Coronary MRA at 3.0T using a three-dimensional breathhold SSFP sequence is feasible. Improved SNR at 3.0T warrants the use of coronary MRA with faster acquisition and/or improved spatial resolution. Further investigations are required to improve the consistency of image quality and signal uniformity at 3.0T.