Abstract #5071

How reliable is DTI of the lower extremity muscles at high-field (3T) and ultra-high-field (7T) MRI?

Chiara Giraudo¹, Stanislav Motyka¹, Michael Weber¹, Thorsten Feiweier², Siegfried Trattnig¹, and Wolfgang Bogner¹

¹High Field MR Center, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria, ²Siemens Healthcare GmbH, Erlangen, Germany

The feasibility of DTI at 7T was already demonstrated for brain and muscles but, to date, the assessment of its reliability for calf muscles and a comparison with the reliability at 3T were still missing.Our results showed excellent ICCs(>.750) at 7T and 3T mainly for single muscles(e.g.,gastrocnemii’s tracks number).The comparison of absolute differences of the two consecutive measurements with each device demonstrated similar variability except for tracks’ number of the whole-calf(lower absolute difference at 7T;p=0.034) and FA of the gastrocnemius lateralis(lower absolute difference at 3T;p=0.032).Larger studies should further assess the overall performance of 7T for specific healthy and injured muscles.

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