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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.
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