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Phase-encode segmented DWI has also been tested, where all readout k-space data are sampled at each shot, but at a limited number of phase encoding points. Such sequences can provide higher spatial resolution and imaging in all orientations. However, this sampling scheme cannot be easily combined with 2D, non-linear, navigator phase correction. Accordingly, phase-encode segmented DW images are more prone to motion-induced aliasing artifacts than readout-segmented ones.
Morelli JN, Saettele MR, Rangaswamy RA, et al. Echo planar diffusion-weighted imaging: possibilities and considerations with 12- and 32-channel head coils. J Clin Imaging Sci 2012;2:31.
Pipe JG, Farthing VG, Forbes KP. Multishot diffusion-weighted FSE using PROPELLER MRI. Magn Reson Med 2002; 47:42-52.
Porter DA, Heidemann RM. High resolution diffusion‑weighted imaging using readout‑segmented echo‑planar imaging, parallel imaging and a two‑dimensional navigator‑based reacquisition. Magn Reson Med 2009;62:468‑75.
What is echo-planar imaging (EPI)? Is this the same as Fast Spin Echo (FSE)?
You alluded to different trajectories for filling k-space. What are they?
How does PROPELLER reduce motion artifacts?