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AJNR - American Journal of Neuroradiology

Published ahead of print on November 16, 2007
doi: 10.3174/ajnr.A0811

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Poststroke Cerebral Peduncular Atrophy Correlates with a Measure of Corticospinal Tract Injury in the Cerebral Hemisphere

V.W. Mark^a, E. Taub^b, C. Perkins^b, L.V. Gauthier^b, G. Uswatte^b and J. Ogorek^b

^a Departments of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, Alabama
^b Department of Psychology, University of Alabama at Birmingham, Birmingham, Alabama

View larger version (109K): [in this window] [in a new window]   Fig 1. Determination of peduncular asymmetry ratio. A, Original axial T1 image. B, Cerebral peduncles in magnified view, demonstrating smaller area on the figure’s left than on the right. C, Demarcation of medial boundary of peduncles. D, The enclosed areas of the demarcated peduncles that are to be measured by planimetry, shown in white. The peduncular asymmetry ratio is then calculated in this instance by dividing the left area by the right area.

View larger version (30K): [in this window] [in a new window]   Fig 2. Schematic demonstration of calculation of maximal proportional CST overlap by infarction. In this example, the infarction overlaps 30% of the CST area in the axial plane.

View larger version (12K): [in this window] [in a new window]   Fig 3. Relationship between peduncular asymmetry ratio and maximal proportion of CST overlap by infarction in the cerebral hemisphere.