PURPOSE: To determine the clinical efficacy of diffusion-weighted and perfusion echo-planar magnetic resonance (MR) imaging in the evaluation of @entity7025 . MATERIALS AND METHODS: Seventeen @entity1 with @entity7025 were examined prospectively with diffusion-weighted and perfusion echo-planar MR imaging and conventional angiography. The change in the effective transverse relaxation rate (delta R2*) peak value, delta R2* peak time, and delta R2* integral were calculated to assess regional cerebral perfusion. The MR images were compared with angiographic images. RESULTS: Of the 34 posterior cerebral arteries (PCAs) of the 17 @entity1 , 14 PCAs (41%) in 11 @entity1 showed @entity850 or @entity432 . The delta R2* peak value ratio in the cerebral hemispheres decreased significantly, and the delta R2* peak time ratio increased significantly, with @entity5546 and @entity432 . However, no correlation was apparent between perfusion and extent of the stenotic or occlusive lesions of the internal carotid artery bifurcation. The frequency of @entity385 was significantly increased in @entity1 with stenotic or occlusive @entity75 . For three acute @entity1188 , a decrease in the apparent diffusion coefficient was significantly correlated with a decrease in the delta R2* peak value, an increase in the delta R2* peak time, and a decrease in the delta R2* integral. CONCLUSION: Regional cerebral perfusion in @entity7025 is decreased and delayed with @entity5546 , with greater decrease and delay with @entity432 . Diffusion-weighted and perfusion imaging are useful for evaluating @entity2806 in @entity7025 .

XXXX : evaluation with diffusion-weighted and perfusion echo-planar MR imaging.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity2806 :: ('MESH:D002545', 'Disease') :: ['cerebral ischemia'] @entity75 :: ('MESH:D001927', 'Disease') :: ['PCA lesions'] @entity5546 :: ('MESH:C562643', 'Disease') :: ['PCA stenosis'] @entity1188 :: ('MESH:D007238', 'Disease') :: ['infarctions'] @entity7025 :: ('MESH:D009072', 'Disease') :: ['moyamoya disease'] @entity432 :: ('MESH:D001157', 'Disease') :: ['PCA occlusion', 'occlusion'] @entity850 :: ('MESH:D003251', 'Disease') :: ['stenosis'] @entity385 :: ('MESH:D002544', 'Disease') :: ['cerebral infarctions']
@entity7025 :: (MESH:D009072,Disease) :: ['Moyamoya disease']
