Abstract #3176

Imaging of calf muscle contraction in pediatric patients with cerebral palsy: comparison of voluntary motion and electrically evoked motion

Claudia Weidensteiner^1,2, Xeni Deligianni^1,2, Tanja Haas¹, Philipp Madoerin¹, Oliver Bieri^1,2, Meritxell Garcia³, Jacqueline Romkes⁴, Erich Rutz⁵, Francesco Santini^1,2, and Reinald Brunner⁶

¹Department of Radiology, Division of Radiological Physics, University Hospital Basel, Basel, Switzerland, ²Department of Biomedical Engineering, University of Basel, Basel, Switzerland, ³Department of Radiology, Division of Neuroradiology, University Hospital Basel, Basel, Switzerland, ⁴Laboratory for Movement Analysis, University Children's Hospital Basel, Basel, Switzerland, ⁵Hugh Williamson Gait Laboratory, The Royal Children's Hospital Melbourne, Parkville, Australia, ⁶Department of Orthopedic Surgery, University Children's Hospital Basel, Basel, Switzerland

Aim of this study is to investigate the feasibility of phase contrast imaging at 3T for assessment of muscle function in children with cerebral palsy. Time-resolved cine phase contrast MRI was synchronized with (a) electrical muscle stimulation (EMS) of the calf muscle (b) voluntary plantarflexion following visual instructions. The achieved force was higher for the voluntary task, but its periodicity was lower compared to the stimulated contraction. Therefore, it was not possible to resolve two distinct velocity peaks for voluntary contraction and release, but it was during EMS, in case the tolerated current was high enough to evoke sufficient contraction.

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