Abstract #5003

Repeatability of quantitative muscle strain and strain rate measurements by means of synchronous dynamic muscle MRI during electrical muscle stimulation

Xeni Deligianni^1,2, Michele Pansini³, Meritxell Garcia⁴, Anna Hirschmann⁴, Arno Schmidt-Trucksäss⁵, Oliver Bieri^1,2, and Francesco Santini^1,2

¹Radiology, Division of Radiological Physics, University of Basel Hospital, Basel, Switzerland, ²Biomedical Engineering, University of Basel, Basel, Switzerland, ³Ricerche Diagnostiche Srl, Bari, Italy, ⁴Musculoskeletal Radiology, Clinic of Radiology and Nuclear Medicine, University of Basel Hospital, Basel, Switzerland, ⁵Sports Medicine, University of Basel, Switzerland

Stimulation of the quadriceps muscle group of the thigh and synchronous phase contrast imaging at a 3T MRI scanner were applied to six healthy volunteers, to assess repeatability of the dynamic strain and strain rate maps. The repeatability was higher for strain (ICC=0.665-0.751) than for strain rate (ICC=0.242-0.571) and the correlation of the results increased with longer intra-scan rest periods. In conclusion, strain and strain rate measured with synchronous MRI of EMS-controlled muscle contraction are repeatable, though attention should be paid to intra-stimulation rest periods.

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