A variable flip angle-based method for reducing blurring in 3D GRASE ASL

Journal article


Liang, Xiaoyun, Connelly, Alan, Tournier, Jacques-Donald and Calamante, Fernando. (2014) A variable flip angle-based method for reducing blurring in 3D GRASE ASL. Physics in Medicine and Biology. 59(18), pp. 5559 - 5573. https://doi.org/10.1088/0031-9155/59/18/5559
AuthorsLiang, Xiaoyun, Connelly, Alan, Tournier, Jacques-Donald and Calamante, Fernando
Abstract

Arterial Spin Labeling (ASL) is an MRI technique to measure cerebral blood flow directly and noninvasively, and thus provides a more direct quantitative correlate of neural activity than blood-oxygen-level-dependent fMRI. A 3D gradient and spin-echo (GRASE) sequence is capable of enhancing signal-to-noise ratio, and has been shown to be a very useful readout module for ASL sequences. Nonetheless, the introduction of significant blurring in its single-shot version, due to T2 decay along the partition dimension, compromises the achievable spatial resolution, limiting the potential of this technique for whole-brain coverage. To address this issue, a method for reducing blurring based on a variable flip angle (VFA) scheme is proposed in this study for 3D GRASE ASL perfusion. Numerical simulations show that the proposed method is capable of reducing the blurring significantly compared to the standard constant flip angle approach; this result was further confirmed using in vivo data. The proposed VFA method should therefore be of significance to 3D GRASE ASL fMRI studies, since it is able to reduce blurring without sacrificing temporal resolution.

Keywordsarterial spin labeling; 3D GRASE; blurring; variable flip angle; perfusion
Year2014
JournalPhysics in Medicine and Biology
Journal citation59 (18), pp. 5559 - 5573
PublisherInstitute of Physics Publishing Ltd.
ISSN0031-9155
Digital Object Identifier (DOI)https://doi.org/10.1088/0031-9155/59/18/5559
Scopus EID2-s2.0-84906902014
Page range5559 - 5573
Research GroupMary MacKillop Institute for Health Research
Place of publicationUnited Kingdom
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