Manifold-based respiratory phase estimation enables motion and distortion correction of free-breathing cardiac diffusion tensor MRI.
Manifold-based respiratory phase estimation enables motion and distortion correction of free-breathing cardiac diffusion tensor MRI.
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DOI：
10.1002/mrm.28972
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发表时间：
2022-01
影响因子：
3.3
通讯作者：
Nguyen CT
中科院分区：
文献类型：
--
作者：
Coll-Font J;Chen S;Eder R;Fang Y;Han QJ;van den Boomen M;Sosnovik DE;Mekkaoui C;Nguyen CT
对于体内心脏弥散张量成像（DTI），呼吸运动和B 0场不均匀性在利用常规单次激发回波平面成像（EPI）采集的弥散加权（DW）图像中产生未对准和几何失真。我们建议使用降维方法来回顾性地估计DW图像的呼吸相位，并促进失真校正（DisCo）和运动补偿（MoCo）。对11名健康志愿者进行了自由呼吸ECG触发的全左心室（LV）心脏DTI，使用二阶运动补偿自旋回波EPI序列和交替方向性相位编码信号。在将DW图像投影到具有拉普拉斯特征映射的2D空间中之后，估计每个DW图像的呼吸相位。将DisCo和MoCo应用于呼吸分类DW图像。结果与传统的屏气HASTE进行了比较。心脏DTI参数，包括分数各向异性（FA），平均扩散率（MD），螺旋角透壁性（HAT）进行了比较和不DisCo。DisCo和MoCo后的LV几何形状显著改善了DW图像与HASTE参考的对齐。DisCo使左心室轮廓之间的距离减少了13.2+/-19.2% p<0.05（DisCo为2.0+/-0.4 mm，未校正为2.4+/-0.5 mm）。DisCo DTI参数图显示无显著差异（MD：1.55+/−0.13 x10− 3 mm 2/s和1.53+/−0.13 x10− 3 mm 2/s，p=0.09; FA：0.375+/−0.041和0.379+/−0.045，p=0.11; HAT：1.00+/−0.10 °/%和0.99+/−0.12 °/%，p=0.44），尽管单个张量的方向不同。在自由呼吸心脏DTI中使用基于LE的DisCo和MoCo进行回顾性呼吸相位估计，可显著减少几何失真，并改善切片内和切片间的对齐。
For in-vivo cardiac diffusion-tensor imaging (DTI), breathing motion and B0 field inhomogeneities produce misalignment and geometric distortion in diffusion weighted (DW) images acquired with conventional single shot echo planar imaging (EPI). We propose using a dimensionality reduction method to retrospectively estimate the respiratory phase of DW images and facilitate both distortion correction (DisCo) and motion compensation (MoCo). Free-breathing ECG-triggered whole left-ventricular (LV) cardiac DTI using a second order motion compensated spin echo EPI sequence and alternating directionality of phase encoding blips was performed on eleven healthy volunteers. The respiratory phase of each DW image was estimated after projecting the DW images into a 2D space with Laplacian Eigenmaps. DisCo and MoCo was applied to the respiratory sorted DW images. The results were compared against conventional breath-held HASTE. Cardiac DTI parameters including fractional anisotropy (FA), mean diffusivity (MD), and helix angle transmurality (HAT) were compared with and without DisCo. The LV geometries after DisCo and MoCo resulted in significantly improved alignment of DW images with HASTE reference. DisCo reduced the distance between the LV contours by 13.2+/−19.2% p<0.05 (2.0+/−0.4 for DisCo and 2.4+/−0.5 mm for uncorrected). DisCo DTI parameter maps yielded no significant differences (MD: 1.55+/−0.13 x10−3mm2/s and 1.53+/−0.13 x10−3mm2/s, p=0.09; FA: 0.375+/−0.041 and 0.379+/−0.045, p=0.11; HAT: 1.00+/−0.10 °/% and 0.99+/−0.12 °/%, p=0.44), although the orientation of individual tensors differed. Retrospective respiratory phase estimation with LE-based DisCo and MoCo in free-breathing cardiac DTI resulting in significantly reduced geometric distortion and improved alignment within and across slices.
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影响因子：
3.5
作者：
Garyfallidis E;Brett M;Amirbekian B;Rokem A;van der Walt S;Descoteaux M;Nimmo-Smith I;Dipy Contributors
通讯作者：
Dipy Contributors
影响因子：
5.7
作者：
Andersson JLR;Graham MS;Drobnjak I;Zhang H;Campbell J
通讯作者：
Campbell J
DOI：
10.1111/jon.12708
发表时间：
2020-05
期刊：
Journal of neuroimaging : official journal of the American Society of Neuroimaging
影响因子：
--
作者：
Afacan O;Hoge WS;Wallace TE;Gholipour A;Kurugol S;Warfield SK
通讯作者：
Warfield SK
影响因子：
10.6
作者：
Hodneland, Erlend;Hanson, Erik A.;Munthe-Kaas, Antonella Z.
通讯作者：
Munthe-Kaas, Antonella Z.
影响因子：
3.3
作者：
Aliotta, Eric;Wu, Holden H.;Ennis, Daniel B.
通讯作者：
Ennis, Daniel B.