Abstract #2807

The influence of the knee position on vTE-T2* values of patellar- and quadriceps tendon measured at 3T and 7T

Benedikt Hager^1,2, Markus M. Schreiner³, Vladimir Mlynarik¹, Vladimir Juras¹, Xeni Deligianni^4,5, Oliver Bieri^4,5, Reinhard Windhager³, and Siegfried Trattnig^1,2

¹Department of Biomedical Imaging and Image-guided Therapy, High Field MR Centre, Medical University of Vienna, Vienna, Austria, ²CD Laboratory for Clinical Molecular MR Imaging, Vienna, Austria, ³Department of Orthopaedics and Trauma Surgery, Medical University of Vienna, Vienna, Austria, ⁴Department of Radiology, Division of Radiological Physics, University of Basel Hospital, Basel, Switzerland, ⁵Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland

In our study in which we used a variable echo-time sequence for T₂*-mapping of tendons in vivo at 3T and 7T, we showed that even small changes in the knee position in the knee coil can lead to significant changes in the T₂*-values of the patellar tendon and quadriceps tendon. We have also shown that the T₂*-values of the tendons correlate well with the angle of the bulk of the collagen fibers to the magnetic field. Based on these results, we recommend that for T₂*-mapping it is important to examine the tendon in exactly the same position in the follow-up.

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