Real-time geometric distortion correction for interventional imaging with echo-planar imaging (EPI)

Iulius Dragonu (1) , Baudouin Denis de Senneville (2) , Bruno Quesson (1) , Chrit Moonen (1) , Mario Ries (3)

1 Imagerie moléculaire et fonctionnelle: de la physiologie à la thérapie
2 IMB - Institut de Mathématiques de Bordeaux
3 University Medical Center [Utrecht]

Many MR-guided interventional procedures rely on fast imaging sequences for providing images in real-time with a precise relation between the target position in the image and its true position. Echo-planar imaging (EPI) methods are very fast but prone to geometric distortions. Here, we propose a correction method designed for real-time conditions, adapting existing approaches based on dual EPI acquisition with varying echo times. The method is demonstrated with MR-thermometry for guiding thermal therapies. The proposed approach imposes a small penalty in acquisition speed but adds negligible latency to data processing, an important element for interventions of mobile organs.

Domaines: Traitement du signal et de l'image [eess.SP]; Imagerie

Iulius Dragonu, Baudouin Denis de Senneville, Bruno Quesson, Chrit Moonen, Mario Ries. Real-time geometric distortion correction for interventional imaging with echo-planar imaging (EPI). Magnetic Resonance in Medicine, 2009, 61 (4), pp.994-1000. ⟨10.1002/mrm.21903⟩. ⟨hal-01503905⟩