TOF MIP image (A), TWIST arterial phase subtracted MIP image (B), and HR MRA subtracted MIP image (C) demonstrate ulcerated plaque of the left ICA in an.

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Presentation transcript:

TOF MIP image (A), TWIST arterial phase subtracted MIP image (B), and HR MRA subtracted MIP image (C) demonstrate ulcerated plaque of the left ICA in an 80-year-old man (patient 4), causing mild (46%) stenosis (arrows). TOF MIP image (A), TWIST arterial phase subtracted MIP image (B), and HR MRA subtracted MIP image (C) demonstrate ulcerated plaque of the left ICA in an 80-year-old man (patient 4), causing mild (46%) stenosis (arrows). The degree of stenosis was overestimated by both readers using the TOF technique (73% and 65% for readers 1 and 2, respectively) and was accurately categorized for TWIST MRA (31% and 47%) and HR MRA (32% and 35%). TOF stenosis overestimation was attributed to in-plane saturation effects, because the proximal ICA is approaching the axial imaging plane in its orientation. Note the clear arterial phase image obtained by using the TWIST technique and the presence of venous contamination on the HR image. R.P. Lim et al. AJNR Am J Neuroradiol 2008;29:1847-1854 ©2008 by American Society of Neuroradiology