An MRI protocol for RT planning: preliminary results for distortion, contrast and bulk density assignment. Protocole IRM pour la planification RT : résultats préliminaires pour la distorsion, le contraste et l'assignation de densité

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Sayaque, Laura | Benjamin, Leporq | Chloé, Miran | Olivier, Hamelin | Frank, Pilleul | Gregoire, Vincent | Beuf, Olivier

Edité par CCSD -

International audience. The excellent contrast between soft tissues in MRI is of great interest for head and neck radiotherapy planning. This work presents an in vivo study aiming to evaluate a multimodal acquisition protocol for tumors and organs at risks delineation and synthetic CT reconstruction based on a density assignment method. Our results showed better contrast between the tumor and healthy tissues with injected T1 MRI compared to injected CT (44,7 +/-30,5 vs 29,9 +/-27,2) and acceptable geometric distortions (less than 2mm). Fat content mean absolute error between CT and synthetic CT is about 0,27.

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