Publication: Distortion-free, high-isotropic-resolution diffusion MRI with gSlider BUDA-EPI and multicoil dynamic B<inf>0</inf> shimming
Issued Date
2021-08-01
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ISSN
15222594
07403194
07403194
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2-s2.0-85102312694
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Mahidol University
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SCOPUS
Bibliographic Citation
Magnetic Resonance in Medicine. Vol.86, No.2 (2021), 791-803
Suggested Citation
Congyu Liao, Berkin Bilgic, Qiyuan Tian, Jason P. Stockmann, Xiaozhi Cao, Qiuyun Fan, Siddharth Srinivasan Iyer, Fuyixue Wang, Chanon Ngamsombat, Wei Ching Lo, Mary Kate Manhard, Susie Y. Huang, Lawrence L. Wald, Kawin Setsompop Distortion-free, high-isotropic-resolution diffusion MRI with gSlider BUDA-EPI and multicoil dynamic B<inf>0</inf> shimming. Magnetic Resonance in Medicine. Vol.86, No.2 (2021), 791-803. doi:10.1002/mrm.28748 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/78020
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Title
Distortion-free, high-isotropic-resolution diffusion MRI with gSlider BUDA-EPI and multicoil dynamic B<inf>0</inf> shimming
Abstract
Purpose: We combine SNR-efficient acquisition and model-based reconstruction strategies with newly available hardware instrumentation to achieve distortion-free in vivo diffusion MRI of the brain at submillimeter-isotropic resolution with high fidelity and sensitivity on a clinical 3T scanner. Methods: We propose blip-up/down acquisition (BUDA) for multishot EPI using interleaved blip-up/blip-down phase encoding and incorporate B0 forward-modeling into structured low-rank reconstruction to enable distortion-free and navigator-free diffusion MRI. We further combine BUDA-EPI with an SNR-efficient simultaneous multislab acquisition (generalized slice-dithered enhanced resolution [“gSlider”]), to achieve high-isotropic-resolution diffusion MRI. To validate gSlider BUDA-EPI, whole-brain diffusion data at 860-μm and 780-μm data sets were acquired. Finally, to improve the conditioning and minimize noise penalty in BUDA reconstruction at very high resolutions where B0 inhomogeneity can have a detrimental effect, the level of B0 inhomogeneity was reduced by incorporating slab-by-slab dynamic shimming with a 32-channel AC/DC coil into the acquisition. Whole-brain 600-μm diffusion data were then acquired with this combined approach of gSlider BUDA-EPI with dynamic shimming. Results: The results of 860-μm and 780-μm datasets show high geometry fidelity with gSlider BUDA-EPI. With dynamic shimming, the BUDA reconstruction’s noise penalty was further alleviated. This enables whole-brain 600-μm isotropic resolution diffusion imaging with high image quality. Conclusions: The gSlider BUDA-EPI method enables high-quality, distortion-free diffusion imaging across the whole brain at submillimeter resolution, where the use of multicoil dynamic B0 shimming further improves reconstruction performance, which can be particularly useful at very high resolutions.