Real-time geometric distortion correction for interventional imaging with echo-planar imaging (EPI).
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.
Dragonu
Iulius
I
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.
de Senneville
Baudouin Denis
BD
Quesson
Bruno
B
Moonen
Chrit
C
Ries
Mario
M
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*