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In vivo diffusion tensor imaging of the human calf muscle

✍ Scribed by Shantanu Sinha; Usha Sinha; V. Reggie Edgerton

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
672 KB
Volume
24
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

Purpose

To demonstrate the feasibility of in vivo calf muscle fiber tracking in human subjects.

Materials and Methods

An EPI‐based diffusion tensor imaging (DTI) sequence with six‐direction diffusion gradient sensitization was implemented, and DT images were acquired at 3 Tesla on five subjects using an extremity coil. The mean diffusivity, fractional anisotropy (FA), and fiber angle (with respect to the magnet z‐axis) were measured in different muscles, and fibers were tracked from several regions of interest (ROIs).

Results

The fiber orientations in the current DTI studies agree well with those determined in previous spectroscopic studies. The orientation angles ranged from 13.4° in the lateral gastrocnemius to 48.5° in the medial soleus. The diffusion ellipsoid in muscle tissue is anisotropic and approximates a prolate model, as shown by color maps of the anisotropy. Fibers were tracked from the different muscle regions, and the unipennate and bipennate structure of muscle fibers was visualized.

Conclusion

The study clearly shows that in vivo fiber tracking of muscle fibers is feasible and could potentially be applied to study muscle structure function relationships. J. Magn. Reson. Imaging 2006. © 2006 Wiley‐Liss, Inc.

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