A robust motion compensation algorithm for volumetric MR-temperature monitoring during microwave ablation of liver tumor in patients
Résumé
Micro-wave tumor ablation (MWA) in the liver could benefit from magnetic resonance guidance that enable real-time temperature and lesion size monitoring during the energy delivery. Nevertheless, motion of abdominal organs causes significant challenges [2] and can be addressed either by synchronizing the acquisition with the physiological motion or by acquiring continuously the acquisition and compensating for the effect of displacement on magnitude and phase images using additional image processing method. In such context, local intensity changes during MWA ablation (due to changes in tissue properties with heating) may be interpreted as motion and lead to local erroneous displacement vector fields, which can compromise MR temperature mapping. We investigate the use of a novel motion compensation algorithm during liver tumor ablation. The performance of the method was retrospectively evaluated on experimental images under gated conditions.
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