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Abstract #0477

An 8Tx/8Rx coil validation workflow toward Virtual Observation Points-based parallel transmission cervical spinal cord in vivo imaging at 7T

Aurélien Massire1,2,3, Andreas K. Bitz4, Nicolas Boulant5, Dorothee Schüler6, Tobias Wichmann 6, Thomas Troalen7, Jean-Philippe Ranjeva1,2,3, and Virginie Callot1,2,3

1Aix-Marseille Université, CNRS, CRMBM UMR 7339, Marseille, France, Marseille, France, 2AP-HM, Hôpital de la Timone, Pôle d’imagerie médicale, CEMEREM, Marseille, France, 3iLab-Spine - Laboratoire international associé - Imagerie et Biomécanique du rachis, France/Canada, 4Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 5UNIRS, NeuroSpin, CEA/DSV/I2BM, Gif-sur-Yvette, France, 6RAPID Biomedical GmbH, Rimpar, Germany, 7Siemens Healthineers, Saint-Denis, France

Parallel transmission is a cutting-edge asset to tackle RF field inhomogeneity or to realize inner volume selection for cervical spinal cord imaging at 7T. To perform VOP-based pTx in vivo exams with a dedicated 8Tx/8Rx coil the following workflow is proposed: 1) starting from electromagnetic simulations on generic human body models, Q-matrices sets were compressed with the VOP method. 2) B1+ mapping was performed on a phantom with known properties to validate these electromagnetic simulations by deriving calibration matrices, and initialize error propagations and further related safety margins. 3) MR thermometry was also performed to cross-check obtained results.

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