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MR diffusion tensor imaging of white matter tract disruption in stroke at 3 T

Departments of ¹Radiology, ²Physiology, ³Neurology and ⁴Neurosurgery and ⁵The Wolfson Brain Imaging Centre, University of Cambridge, Cambridge CB2 2QQ, UK

View larger version (128K): [in a new window]   Figure 1. Two representative slices from the diffusion tensor images (A,B) and the trace images (C,D) in a 55-year-old male smoker (patient No. 3) who presented with a right hemiplegia, right seventh nerve palsy and dysarthria. The diffusion tensor imaging demonstrates displacement of the internal and external capsules (arrows) by an acute stroke based on the left corpus striatum extending into the corona radiata. The trace images confirm an acute ischaemic event.

View larger version (113K): [in a new window]   Figure 2. A 25-year-old smoker (patient No. 9) presented with dysphasia and a right hemiparesis. Diffusion tensor images (A,B) are normal. The initial trace images (C,D) demonstrate a subtle area of increased signal in the anterior left putamen. The patient was re-imaged at 6 days, which demonstrated disruption of white matter tracts in the left corona radiata (E) with associated trace map changes (F) confirming early ischaemia.