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 Temiz^1,2, Fernando Pérez-García^1,2, Catherine Jenny³, Stéphane Lehéricy^1,4, Marguerite Cuttat ³, Didier Dormont⁴, Damien Galanaud^1,4, Chales Valery⁵, Carine Karachi^1,5, Romain Valabregue ², Sara Fernandez-Vidal^1,2, Nadya Pyatigorskaya⁴, and Eric Bardinet^1,2

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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