High‐resolution multi‐shot diffusion‐weighted MRI combining markerless prospective motion correction and locally low‐rank constrained reconstruction

作者：Hao Chen, Ke Dai, Sijie Zhong, Jiaxu Zheng, Xinyue Zhang, Shasha Yang, Tuoyu Cao, Chaohong Wang, Ekin Karasan, Lucio Frydman, Zhiyong Zhang · 发表于：Magnetic Resonance in Medicine · 年份：2022 · DOI：10.1002/mrm.29468 · 被引用次数：11 · 研究领域：Advanced Neuroimaging Techniques and Applications、MRI in cancer diagnosis、Advanced MRI Techniques and Applications

PURPOSE: Subject head motion is a major challenge in DWI, leading to image blurring, signal losses, and biases in the estimated diffusion parameters. Here, we investigate a combined application of prospective motion correction and spatial-angular locally low-rank constrained reconstruction to obtain robust, multi-shot, high-resolution diffusion-weighted MRI under substantial motion. METHODS: Single-shot EPI with retrospective motion correction can mitigate motion artifacts and resolve any mismatching of gradient encoding orientations; however, it is limited by low spatial resolution and image distortions. Multi-shot acquisition strategies could achieve higher resolution and image fidelity but increase the vulnerability to motion artifacts and phase variations related to cardiac pulsations from shot to shot. We use prospective motion correction with optical markerless motion tracking to remove artifacts and reduce image blurring due to bulk motion, combined with locally low-rank regularization to correct for remaining artifacts due to shot-to-shot phase variations. RESULTS: The approach was evaluated on healthy adult volunteers at 3 Tesla under different motion patterns. In multi-shot DWI, image blurring due to motion with 20 mm translations and 30° rotations was successfully removed by prospective motion correction, and aliasing artifacts caused by shot-to-shot phase variations were addressed by locally low-rank regularization. The ability of prospective motion correction to ...