Sequential diffusion-weighted images show bright basal ganglia as the initial finding after anoxia. Sequential diffusion-weighted images show bright basal.

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Presentation transcript:

Sequential diffusion-weighted images show bright basal ganglia as the initial finding after anoxia. Sequential diffusion-weighted images show bright basal ganglia as the initial finding after anoxia. A, Axial high-strength diffusion-weighted image (0.8/123/1100), obtained less than 3 hours after cardiac arrest (because of electrocution), shows abnormal brightness in lentiform nuclei (arrows). Brightness in splenium of corpus callosum is normal because transverse white matter fibers are perpendicular to the plane (z) in which the diffusion gradient was applied.B, Axial T2-weighted image (4200/105/1), obtained 3 days after insult, shows increased signal intensity in basal ganglia and possibly in occipital cortices.C, High-strength diffusion-weighted image (0.8/123/1100), obtained at same time as the image shown in B, reveals abnormally bright basal ganglia and cortex in frontal, posterior temporal, and occipital lobes.D, High-strength diffusion-weighted image (0.8/123/1100), obtained at same time as the image shown in B, shows that the cortex in the frontal and parietal regions is abnormally bright.E, High-strength diffusion-weighted image (0.8/123/1100), obtained 14 days after insult and corresponding to the image shown in C, reveals decreasing signal intensity from gray matter structures and abnormal brightness in posterior limb of internal capsules.F, Axial high-strength diffusion-weighted image (0.8/123/1100), obtained at the same time as the image shown in E and at same level as the image shown in D, reveals decreasing signal intensity from the cortex and abnormal brightness in the centra semiovale.G, Corresponding conventional T2-weighted image (4500/105/1) shows normal results. This patient survived. Andres Arbelaez et al. AJNR Am J Neuroradiol 1999;20:999-1007 ©1999 by American Society of Neuroradiology