Source
Department of Neurology, Yonsei University College of Medicine, Gangnam-Gu, Seoul, Korea.
Abstract
PURPOSE:
Transient global amnesia (TGA) patients were retrospectively reviewed to determine the usefulness of high-field strength MRI in detecting probable ischemic lesions in TGA.
MATERIALS AND METHODS:
We investigated the lesion detection rate in patients with TGA using 1.5T and 3.0T MRI. Acute probable ischemic lesions were defined as regions of high-signal intensity in diffusion weighted image with corresponding low-signal intensity in apparent diffusion coefficient map.
RESULTS:
3.0T MRI showed 11 out of 32 patients with probable ischemic lesions in the hippocampus with mean lesion size of 2.8 +/- 0.6 mm, whereas 1.5T MRI detected no lesion in any of 11 patients. There were no significant differences in clinical characteristics between the groups of 1.5 and 3.0T MRI.
CONCLUSION:
High-field strength MRI has a higher detection rate of probable ischemic lesions than low-field strength MRI in patients with TGA.