Validation of diffusion tensor MRI‐based muscle fiber tracking

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<jats:title>Abstract</jats:title><jats:p>Diffusion‐tensor (DT) MRI fiber tracking may potentially be used for in vivo structural analysis. The purpose of this study was to assess quantitatively the ability of a DT‐MRI fiber‐tracking algorithm to measure the fiber orientation (pennation) in skeletal muscle in vivo. In five adult Sprague‐Dawley rats, the pennation angle (θ) was measured in the rat lateral gastrocnemius with DT‐MRI (θ<jats:sub>DT‐MRI</jats:sub>) and by direct anatomical inspection (DAI) (θ<jats:sub>DAI</jats:sub>). The mean θ<jats:sub>DT‐MRI</jats:sub> was not significantly different from the mean θ<jats:sub>DAI</jats:sub>. In addition, the two methods were highly correlated (<jats:italic>r</jats:italic> = 0.89) and the regression of θ<jats:sub>DT‐MRI</jats:sub> on θ<jats:sub>DAI</jats:sub> resulted in a slope not significantly different from 1 and an intercept not significantly different from zero. These data indicate that DT‐MRI‐based fiber tracking as implemented here is a valid tool for in vivo structural analysis of small‐animal skeletal muscle. Magn Reson Med 48:97–104, 2002. © 2002 Wiley‐Liss, Inc.</jats:p>

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