title: Real-time geometric distortion correction for interventional imaging with echo-planar imaging (EPI).
abstract: 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.
authors.affiliation: Laboratory for Molecular and Functional Imaging: from Physiology to Therapy, Unité Mixte de Recherche 5231 Centre National de la Recherche Scientifique/Université Bordeaux 2, Bordeaux, France.
authors.forename: Iulius
authors.initials: I
authors.lastname: Dragonu
authors.forename: Baudouin Denis
authors.initials: BD
authors.lastname: de Senneville
authors.forename: Bruno
authors.initials: B
authors.lastname: Quesson
authors.forename: Chrit
authors.initials: C
authors.lastname: Moonen
authors.forename: Mario
authors.initials: M
authors.lastname: Ries
mesh_terms: D000465:Algorithms; D016477:Artifacts; D017352:Echo-Planar Imaging / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D025321:Surgery, Computer-Assisted / Q000379:methods*