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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