Phase-cycled simultaneous multislice balanced SSFP imaging with CAIPIRINHA for efficient banding reduction.
Phase-cycled simultaneous multislice balanced SSFP imaging with CAIPIRINHA for efficient banding reduction.
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DOI：
10.1002/mrm.26076
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发表时间：
2016-12
影响因子：
3.3
通讯作者：
Wang DJ
中科院分区：
文献类型：
--
作者：
Wang Y;Shao X;Martin T;Moeller S;Yacoub E;Wang DJ
旨在通过使用CAIPIRINHA的相位循环同步多切片（SMS）采集（并行成像中的受控混叠导致更高的加速度），提供一种在平衡稳态自由进动（bSSFP）成像中减少条带的时间效率技术。所提出的技术利用SMS成像与CAIPIRINHA的固有相位调制来获取多个相位循环图像，其可以被组合以在单频带bSSFP扫描的相同扫描时间内有效地减少条带。Bloch方程模拟，体模和在体脑，腹部和心脏成像实验在健康志愿者在3T使用多通道头部和身体阵列线圈与SMS加速因子为2至4。在体模和人体研究中，根据信号分布的涟漪和信噪比（SNR）效率定量评价条带减少的性能。使用相位循环SMS bSSFP成像在2至4的SMS因子范围内成功去除或抑制了条带伪影。条带减少的性能随着SMS因子的提高而改善，沿着SNR效率的提高。具有CAIPIRINHA的相位循环SMS bSSFP是用于bSSFP中的有效频带减少而不延长扫描时间的有前途的技术。这项技术在临床应用中的进一步评价是必要的。
To present a time-efficient technique for banding reduction in balanced steady-state free precession (bSSFP) imaging by utilizing phase-cycled simultaneous multi-slice (SMS) acquisition with CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration). The proposed technique exploits the inherent phase modulation of SMS imaging with CAIPIRINHA to acquire multiple phase-cycled images, which can be combined for efficient banding reduction within the same scan time of a single-band bSSFP scan. Bloch equation simulation, phantom and in vivo brain, abdominal and cardiac imaging experiments were performed on healthy volunteers at 3T using multi-channel head and body array coils with SMS acceleration factors of two to four. The performance of banding reduction was quantitatively evaluated based on the percent ripple of signal distribution and signal-to-noise ratio (SNR) efficiency in both phantom and human studies. The banding artifact was successfully removed or suppressed using phase-cycled SMS bSSFP imaging across SMS factors of two to four. The performance of banding reduction improved with higher SMS factors along with increased SNR efficiency. Phase-cycled SMS bSSFP with CAIPIRINHA is a promising technique for efficient band reduction in bSSFP without prolonged scan time. Further evaluation of this technique in clinical applications is warranted.