Prospective motion correction for single-voxel 1H MR spectroscopy.

Prospective motion correction for single-voxel 1H MR spectroscopy.
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DOI:
10.1002/mrm.22448
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发表时间:
2010-09
影响因子:
3.3
通讯作者:
Ernst, Thomas
Ernst, Thomas
中科院分区:
医学3区
文献类型:
--
作者:
Keating, Brian;Deng, Weiran;Roddey, J. Cooper;White, Nathan;Dale, Anders;Stenger, V. Andrew;Ernst, Thomas

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1H磁共振波谱(MRS)采集过程中的头部运动可能会影响体内代谢物测量的质量和可靠性。因此,基于3平面图像的运动跟踪模块被集成到单体素1H MRS(PRESS)序列中。为了估计头部运动,在MRS水抑制模块之前采集了一系列3个正交螺旋导航仪图像。通过应用适当的旋转和平移,可以更新MRS体素位置,以使其相对于大脑保持静止。在后处理过程中进行了频率和相位校正,以减小线宽并恢复相干平均。11名志愿者在故意头部运动过程中获得的光谱显示,当应用运动校正时,减少了脂质污染,提高了光谱重复性。
Head motion during 1H MR spectroscopy (MRS) acquisitions may compromise the quality and reliability of in vivo metabolite measurements. Therefore, a 3-plane image-based motion tracking module was integrated into a single-voxel 1H MRS (PRESS) sequence. A series of 3 orthogonal spiral navigator images were acquired immediately prior to the MRS water suppression module in order to estimate head motion. By applying the appropriate rotations and translations, the MRS voxel position can be updated such that it remains stationary with respect to the brain. Frequency and phase corrections were applied during post-processing to reduce line-width and restore coherent averaging. Spectra acquired during intentional head motion in 11 volunteers demonstrate reduced lipid contamination and increased spectral reproducibility when motion correction is applied.
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发表时间: 1987-05-01
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