Mitigation of near-band balanced steady-state free precession through-plane flow artifacts using partial dephasing.
Mitigation of near-band balanced steady-state free precession through-plane flow artifacts using partial dephasing.
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DOI：
10.1002/mrm.26957
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发表时间：
2018-06
影响因子：
3.3
通讯作者：
Nishimura DG
中科院分区：
文献类型：
--
作者：
Datta A;Cheng JY;Hargreaves BA;Baron CA;Nishimura DG
使用部分失相减轻平衡稳态自由进动（SSFP）中稳态阻带位置处的过平面流伪影。通过略微不平衡切片选择移相器，在TR期间在体素上创建60°范围的相位增加。模拟了在不同恒定流速和脉动流期间具有部分去相位的SSFP的光谱轮廓，以确定部分去相位是否减少了源自SSFP暗带附近的通过平面的流动伪影，同时保持共振信号。然后在流动体模中验证模拟。最后，在6名受试者中采集了相位循环SSFP心脏电影图像（有和无部分失相）。部分移相降低了信号在阻带处对通过平面的流速的依赖性的强度和非线性。因此，它减轻了超增强的切片外信号的贡献和瞬态相关的伪影所造成的可变流量在体模和体内。在6名志愿者中，部分失相明显减少了所有相位循环心脏电影数据集中的伪影。部分去相位可以减轻在平衡SSFP中的阻带处看到的流动伪影，同时保持序列的期望信号。通过减轻源于阻带的超增强和瞬态相关伪影，部分失相有助于心脏中的稳健的多采集相位循环SSFP。
To mitigate artifacts from through-plane flow at the locations of steady-state stopbands in balanced steady-state free precession (SSFP) using partial dephasing. A 60° range in the phase accrual during a TR was created over the voxel by slightly unbalancing the slice-select dephaser. The spectral profiles of SSFP with partial dephasing for various constant flow rates and during pulsatile flow were simulated to determine if partial dephasing decreases through-plane flow artifacts originating near SSFP dark bands while maintaining on-resonant signal. Simulations were then validated in a flow phantom. Lastly, phase-cycled SSFP cardiac cine images were acquired with and without partial dephasing in six subjects. Partial dephasing decreased the strength and nonlinearity of the dependence of the signal at the stopbands on the through-plane flow rate. It thus mitigated hyper-enhancement from out-of-slice signal contributions and transient-related artifacts caused by variable flow both in the phantom and in vivo. In six volunteers, partial dephasing noticeably decreased artifacts in all of the phase-cycled cardiac cine datasets. Partial dephasing can mitigate the flow artifacts seen at the stopbands in balanced SSFP while maintaining the sequence’s desired signal. By mitigating hyper-enhancement and transient-related artifacts originating from the stopbands, partial dephasing facilitates robust multiple-acquisition phase-cycled SSFP in the heart.
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影响因子：
3.3
作者：
Bangerter, NK;Hargreaves, BA;Nishimura, DG
通讯作者：
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3.3
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