Abstract #1399

The comparison of two ultra-short echo time methods for T2* mapping in Achilles tendon and enthesis

Vladimir Juras^1,2, Peter Latta³, Martin Kojan³, Zenon Starcuk⁴, Xeni Deligianni⁵, Oliver Bieri⁵, and Siegfried Trattnig¹

¹High Field MR Centre, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria, ²Institute of Measurement Science, Slovak Academy of Sciences, Bratislava 4, Slovakia, ³Central European Institute of Technology, Masaryk University, Brno, Czech Republic, ⁴Institute of Scientific Instruments, Czech Academy of Sciences, Brno, Czech Republic, ⁵Division of Radiological Physics, Department of Radiology, University of Basel Hospital, Basel, Switzerland

We compared the performance of two MR techniques, ultra-short TE (UTE) and variable-echo time (vTE), to estimate mono- and bi-exponential T2* in Achilles tendon and enthesis at 3T. In axial slice orientation, the mean T2* values for UTE were (mono, short, long) 4.1 ± 1.1 ms, 0.9 ± 0.3 ms and 19.6 ± 7 ms, for vTE we found the values 10.5 ± 3.9 ms, 1.4 ± 0.4 ms and 25 ± 3 ms. In sagittal slice orientation, the mean T2* values for UTE were (mono, short, long) 2.8 ± 0.5 ms, 0.4 ± 0.1 ms and 10.5 ± 1.7 ms, for vTE we found the values 5.3 ± 1.5 ms, 1.6 ± 0.3 ms and 22.3 ± 5.6 ms. T2* values calculated with vTE are overestimated in comparison to UTE, however, the clinical value of vTE might be higher, since it provides more slices with reduced blurring and lower scan times.

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