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Abstract #4513

Multiparametric evaluation of geometric distortions in stereotactic MR imaging at 1.5 and 3 Tesla with a plexiglass phantom: towards practical recommendations for clinical imaging protocols

Gizem Temiz1,2, Fernando Pérez-García1,2, Catherine Jenny3, Stéphane Lehéricy1,4, Marguerite Cuttat 3, Didier Dormont4, Damien Galanaud1,4, Chales Valery5, Carine Karachi1,5, Romain Valabregue 2, Sara Fernandez-Vidal1,2, Nadya Pyatigorskaya4, and Eric Bardinet1,2

1Institut du Cerveau et de la Moelle épinière, ICM, Inserm U 1127, CNRS UMR 7225, Sorbonne Université, F-75013, Paris, France, 2Centre de Neuro-Imagerie de Recherche, CENIR, Paris, France, 3Department of Radiotherapy, Medical Physics Unit, AP-HP Pitié-Salpêtrière Hospital, Paris, France, 4Department of Neuroradiology, AP-HP Pitié-Salpêtrière Hospital, Paris, France, 5Department of Neurosurgery, AP-HP Pitié-Salpêtrière Hospital, Paris, France

Accurate MRI-based targeting is a critical issue for stereotactic surgery. Therefore, geometric distortions need to be evaluated for any pre-operative MR imaging protocol. In this study, we investigated MRI protocols used in Deep Brain Stimulation and Gamma Knife radiosurgery, and focused on the influence of 5 factors on the geometric distortions, at 1.5T and 3T, for 3D T1-weighted and 3D FLAIR images. We found that in order to minimize geometric distortions in stereotactic imaging operator training, careful centering in the MR scanner and systematic activation of constructor’s distortion correction filter are essentials.

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