American Journal of Neuroradiology 23:794-802, May 2002
© 2002 American Society of Neuroradiology
BRAIN
Diffusion Tensor MR Imaging in Diffuse Axonal Injury
a Department of Medical Physics, University of Wisconsin, Madison
b Department of Radiology, University of Wisconsin, Madison
c Department of Statistics, University of Wisconsin, Madison
d Department of Neurosurgery, University of Wisconsin, Madison
Address reprint requests to Konstantinos Arfanakis, PhD, University of Wisconsin, 1530 Medical Science Center, 1300 University Ave, Madison, WI 53706-1532
BACKGROUND AND PURPOSE: Disruption of the cytoskeletal network and axonal membranes characterizes diffuse axonal injury (DAI) in the first few hours after traumatic brain injury. Histologic abnormalities seen in DAI hypothetically decrease the diffusion along axons and increase the diffusion in directions perpendicular to them. DAI therefore is hypothetically associated in the short term with decreased diffusion anisotropy. We tested this hypothesis by measuring the diffusion characteristics of traumatized brain tissue with use of diffusion tensor MR imaging.
METHODS: Five patients with mild traumatic brain injuries and 10 control subjects were studied with CT, conventional MR imaging, and diffusion tensor imaging. All patients were examined within 24 hours of injury. In each participant, diffusion tensor indices from homologous normal-appearing white matter regions of both hemispheres were compared. These indices were also compared between homologous regions of each patient and the control group. In two patients, diffusion tensor images from the immediate posttrauma period were compared with those at 1 month follow-up.
RESULTS: Patients displayed significant reduction of diffusion anisotropy in several regions compared with the homologous ones in the contralateral hemisphere. Such differences were not observed in the control subjects. Significant reduction of diffusion anisotropy was also detected when diffusion tensor results from the patients were compared with those of the controls. This reduction was often less evident 1 month after injury.
CONCLUSION: White matter regions with reduced anisotropy are detected in the first 24 hours after traumatic brain injury. Therefore, diffusion tensor imaging may be a powerful technique for in vivo detection of DAI.
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