Intracranial aneurysms: evaluation by MR angiography.

摘要: The purpose of this study was to compare the accuracy a volume gradient-echo MR angiography (MRA) technique with that intraarterial digital subtraction (IA DSA) in identification intracranial aneurysms. vasculature examined 47 patients by MRA and compared IA DSA findings 19 these who had saccular or giant remaining 28 patients, whom no aneurysm found, served as control group. performed use velocity-compensated sequence (TR = 40-50/TE 7-15) 15 degree flip angle. sensitivity specificity were calculated for evaluation cine 3D reconstructions (cine MRA) only, + inspection individual partitions, partitions spin-echo studies. Of 21 aneurysms, which three missed two varied from 67% only 86% studies; among it assumed diagnosis any one patient would lead detection additional 73% 95% results suggest can define circle Willis sufficiently allow aneurysms small 3-4 mm. holds promise truly noninvasive screening examination at risk