High temporal resolution motion estimation using a self-navigated simultaneous multi-slice echo planar imaging acquisition.
High temporal resolution motion estimation using a self-navigated simultaneous multi-slice echo planar imaging acquisition.
复制标题
利用自导航同步多切片回波平面成像采集进行高时间分辨率运动估算。
DOI：
10.1002/jmri.25953
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发表时间：
2018-02-13
期刊：
影响因子：
--
通讯作者：
White NS
中科院分区：
文献类型：
--
作者：
Teruel JR;Kuperman JM;Dale AM;White NS
已知主体运动在功能连通性的时间序列中产生伪协方差，据报道会引起距离相关的伪相关。将扩展卡尔曼滤波（EKF）框架应用于静息状态功能MRI （rs-fMRI）序列的高时间分辨率运动校正的可行性研究，该框架使用每个同步多层（SMS）回波平面成像（EPI）镜头作为其自己的导航器。前瞻性可行性研究。三个人类志愿者。3T GE DISCOVERY MR750扫描仪使用32通道头线圈。同时多层rs- fMRI序列，重复时间(TR)/回声时间(TE) = 800/30 ms， SMS因子6。运动估计使用两种技术进行计算：传统的刚体体体方向配准；以及一种高时间分辨率运动估计刚体方法。使用两种方法获得的估计值对参考图像进行重新采样，并使用归一化均方误差（NMSE）总结这些预测体积与原始运动序列之间的差异。NMSE值的直接比较。对于所提出的样本，高时间运动估计总是优于体积运动估计。对于分阶段连续旋转，使用高时间分辨率运动估计的NMSE范围在第一个志愿者（平面内旋转）的[0.130,0.150]之间，第二个志愿者（平面内旋转）的[0.060,0.068]之间，第三个志愿者（平面内旋转）的[0.063,0.080]之间。这些值分别为[0.384,0.464]；[0.136, 0.179];和[0.080,0.096]，分别使用体积方向的运动估计。利用同时多层EPI亚tr镜头，rs-fMRI可以获得准确的高时间刚体运动估计。
Subject motion is known to produce spurious covariance among time-series in functional connectivity that has been reported to induce distance-dependent spurious correlations. To present a feasibility study for applying the extended Kalman filter (EKF) framework for high temporal resolution motion correction of resting state functional MRI (rs-fMRI) series using each simultaneous multi-slice (SMS) echo planar imaging (EPI) shot as its own navigator. Prospective feasibility study. Three human volunteers. 3T GE DISCOVERY MR750 scanner using a 32-channel head coil. Simultaneous multi-slice rs- fMRI sequence with repetition time (TR)/echo time (TE) = 800/30 ms, and SMS factor 6. Motion estimates were computed using two techniques: a conventional rigid-body volume-wise registration; and a high-temporal resolution motion estimation rigid-body approach. The reference image was resampled using the estimates obtained from both approaches and the difference between these predicted volumes and the original moving series was summarized using the normalized mean squared error (NMSE). Direct comparison of NMSE values. High-temporal motion estimation was always superior to volume-wise motion estimation for the sample presented. For staged continuous rotations, the NMSE using high-temporal resolution motion estimates ranged between [0.130, 0.150] for the first volunteer (in-plane rotations), between [0.060, 0.068] for the second volunteer (in-plane rotations), and between [0.063, 0.080] for the third volunteer (through-plane rotations). These values went up to [0.384, 0.464]; [0.136, 0.179]; and [0.080, 0.096], respectively, when using volume-wise motion estimates. Accurate high-temporal rigid-body motion estimates can be obtained for rs-fMRI taking advantage of simultaneous multi-slice EPI sub-TR shots.
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