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Abstract #5003

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

Xeni Deligianni1,2, Michele Pansini3, Meritxell Garcia4, Anna Hirschmann4, Arno Schmidt-Trucksäss5, Oliver Bieri1,2, and Francesco Santini1,2

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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