Abstract #1426

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

Benedikt Hager^1,2, Vladimir Juras^1,2,3, Martin Zalaudek^1,2, Joachim Friske^1,2, Xeni Deligianni⁴, Oliver Bieri⁴, Lena Hirtler⁵, Andreas Berg⁶, Markus Schreiner^1,7, Sonja Walzer⁷, and Siegfried Trattnig^1,2

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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