Contrast-optimal simultaneous multi-slice bSSFP cine cardiac imaging at 0.55 T.
Contrast-optimal simultaneous multi-slice bSSFP cine cardiac imaging at 0.55 T.
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0.55 T 下的对比度最佳同步多切片 bSSFP 电影心脏成像。
DOI：
10.1002/mrm.29472
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发表时间：
2023-02
影响因子：
3.3
通讯作者：
Nayak, Krishna S.
中科院分区：
文献类型：
--
作者：
Tian, Ye;Cui, Sophia X.;Lim, Yongwan;Lee, Nam G.;Zhao, Ziwei;Nayak, Krishna S.
关键词：
为了确定当代0.55 T磁共振成像是否支持使用对比度最佳翻转角(FA)来同时进行多层(SM)平衡SSFP心功能评估，这在常规场强下是不切实际的，因为存在过多的合成孔径雷达和/或条带伪影。BLIPPEP-CAIPI bSSFP结合螺旋采样在0.55 进行心功能评价。对7名健康志愿者拍摄单频段电影，SMS2和3(SMS2和3)，FA 60°~160°。测量由背景噪声和血液-心肌对比度归一化的左心室血和心肌信号强度(SI)，并在不同采集设置下进行比较。单频段的心肌SI略高于Sm段，且随FA的增加而降低。单频段血SI随FA增加而增加，FA ≥12 0°增加幅度较小。SMS2和SMS3的血液SI随着FA的增加而增加，直至∼为100°。当FA ≥为12 0°时，血-心肌对比度随FA增加而增加，在FA=12 0°时达到峰值(收缩：2 8.43，舒张期：2 9.15)，主要归因于心肌SI降低。SMS2的对比度在120°时最大(收缩：21.43，舒张期：19.85)。SMS3的对比度峰值为收缩120°(16.62°)，舒张期100°(19.04°)。配备高性能梯度系统的现代0.55 T磁共振扫描仪允许在不影响图像质量的情况下，使用对比度最佳的FA进行短信加速的bSSFP电影检查。对比度最佳的FA对于单波段是140°到160°，对于SMS2和3是100°到120°。点击这里进行作者和读者的讨论
To determine if contemporary 0.55 T MRI supports the use of contrast‐optimal flip angles (FA) for simultaneous multi‐slice (SMS) balanced SSFP (bSSFP) cardiac function assessment, which is impractical at conventional field strengths because of excessive SAR and/or banding artifacts. Blipped‐CAIPI bSSFP was combined with spiral sampling for ventricular function assessment at 0.55 T. Cine movies with single band and SMS factors of 2 and 3 (SMS 2 and 3), and FA ranging from 60° to 160°, were acquired in seven healthy volunteers. Left ventricular blood and myocardial signal intensity (SI) normalized by background noise and blood–myocardium contrast were measured and compared across acquisition settings. Myocardial SI was slightly higher in single band than in SMS and decreased with an increasing FA. Blood SI increased as the FA increased for single band, and increment was small for FA ≥120°. Blood SI for SMS 2 and 3 increased with an increasing FA up to ∼100°. Blood–myocardium contrast increased with an increasing FA for single band, peaked at FA = 160° (systole: 28.43, diastole: 29.15), attributed mainly to reduced myocardial SI when FA ≥120°. For SMS 2, contrast peaked at 120° (systole: 21.43, diastole: 19.85). For SMS 3, contrast peaked at 120° in systole (16.62) and 100° in diastole (19.04). Contemporary 0.55 T MR scanners equipped with high‐performance gradient systems allow the use of contrast‐optimal FA for SMS accelerated bSSFP cine examinations without compromising image quality. The contrast‐optimal FA was found to be 140° to 160° for single band and 100° to 120° for SMS 2 and 3. Click here for author‐reader discussions
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影响因子：
3.3
作者：
Yutzy, Stephen R.;Seiberlich, Nicole;Duerk, Jeffrey L.;Griswold, Mark A.
通讯作者：
Griswold, Mark A.
影响因子：
19.7
作者：
Campbell-Washburn, Adrienne E.;Ramasawmy, Rajiv;Balaban, Robert S.
通讯作者：
Balaban, Robert S.
影响因子：
3.3
作者：
Srinivasan, Subashini;Ennis, Daniel B.
通讯作者：
Ennis, Daniel B.
影响因子：
3.3
作者：
Restivo, Matthew C.;Ramasawmy, Rajiv;Campbell-Washburn, Adrienne E.
通讯作者：
Campbell-Washburn, Adrienne E.
影响因子：
3.3
作者：
Lee, Nam G.;Ramasawmy, Rajiv;Lim, Yongwan;Campbell-Washburn, Adrienne E.;Nayak, Krishna S.
通讯作者：
Nayak, Krishna S.