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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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