1. Parallel imaging ameliorates susceptibility-induced geometric distortions and T2 and T2* contrast blurring in 3T DWI performed with a single-shot echo-planar sequence.
Parallel imaging ameliorates susceptibility-induced geometric distortions and T2 and T2* contrast blurring in 3T DWI performed with a single-shot echo-planar sequence. A, The b = 1000 s/mm2 DWI image acquired at 3T without parallel imaging shows warping of the pons and anterior temporal lobes. There is also signal-intensity void with adjacent regions of signal-intensity pileup in the temporal lobes. These are typical artifacts encountered with 3T ssEPI DWI due to susceptibility effects from the adjacent air-filled mastoid sinuses and sphenoid sinus. B, The b = 1000 s/mm2 3T DWI image acquired at the same axial level with ASSET parallel imaging (R = 2) demonstrates reduced foreshortening of the pons and reduced warping and signal-intensity distortions in the temporal lobes. There is also mitigation of contrast blurring, seen as improved definition of the cerebellar fissures and folia as well as better gray-white matter differentiation in the occipital lobes.
P. Mukherjee et al. AJNR Am J Neuroradiol 2008;29:
©2008 by American Society of Neuroradiology