Abstract #3316

Reduced Distortion Artifact Whole Brain CBF Mapping using Blip-Reversed Non-Segmented 3D Echo Planar Imaging

Neville D Gai¹, Yi Yu Chou^1,2, Dzung Pham^1,2, and John A Butman¹

¹Radiology & Imaging Sciences, NIH, Bethesda, MD, United States, ²Center for Neuroscience and Regenerative Medicine, Henry Jackson Foundation, Bethesda, MD, United States

Arterial spin labeling is typically performed with segmented k-space acquisition schemes to reduce B0 inhomogeneity related distortion. Non-segmented techniques offer the advantage of higher SNR/time allowing greater brain coverage in shorter scan times. Here we use a modified 3D EPI acquisition scheme along with pseudo-continuous arterial spin labeling to correct for B0 inhomogeneity related distortion. By employing phase encoding along opposite directions in alternating control-label pairs and with subsequent post-processing, we correct for the distortion. CBF images were compared with GM masks obtained from relatively distortion free MPRAGE images to show improved localization of the CBF maps.

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