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Abstract #1426

Anisotropic analysis and decay characteristics of T2* relaxation of the human Achilles tendon studied with 7 T MR-microscopy

Benedikt Hager1,2, Vladimir Juras1,2,3, Martin Zalaudek1,2, Joachim Friske1,2, Xeni Deligianni4, Oliver Bieri4, Lena Hirtler5, Andreas Berg6, Markus Schreiner1,7, Sonja Walzer7, and Siegfried Trattnig1,2

1High-Field MR Centre, Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, 2Christian Doppler Laboratory for Clinical Molecular MR Imaging, Vienna, Austria, 3Department of Imaging Methods, Institute of Measurement Science, Bratislava, Slovakia, 4Division of Radiological Physics, Department of Radiology, University of Basel Hospital, Basel, Switzerland, 5Center for Anatomy and Cell Biology, Department for Systematic Anatomy, Medical University of Vienna, Vienna, Austria, 6Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria, 7Department of Orthopaedic Surgery, Medical University of Vienna, Vienna, Austria

The fiber-to-field angle dependence and the T2* characteristics of a human Achilles tendon were investigated. The results show an increase of approx. factor 20 in T2* values when the long axis of the tendon is change from 0° to 55°, which is much higher than previously reported. Moreover, in contrast to previous findings we found no homogenous biexponential decay behavior for the tendon on a small sized voxel basis. The results reported here are to our knowledge the first MR-microscopy evaluations of the orientational dependence of T2* relaxation in the Achilles tendon.

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