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• W2121727823 abstract "Real-time magnetic resonance imaging is a promising tool for image-guided interventions. For applications such as thermotherapy on moving organs, a precise image-based compensation of motion is required in real time to allow quantitative analysis, retrocontrol of the interventional device, or determination of the therapy endpoint. Reduced field-of-view imaging represents a promising way to improve spatial and / or temporal resolution. However, it introduces new challenges for target motion estimation, since structures near the target may appear transiently due to the respiratory motion and the limited spatial coverage. In this paper, a new image-based motion estimation method is proposed combining a global motion estimation with a novel optical flow approach extending the initial Horn and Schunck (H&S) method by an additional regularization term. This term integrates the displacement of physiological landmarks into the variational formulation of the optical flow problem. This allowed for a better control of the optical flow in presence of transient structures. The method was compared to the same registration pipeline employing the H&S approach on a synthetic dataset and in vivo image sequences. Compared to the H&S approach, a significant improvement (p <; & 0.05) of the Dice's similarity criterion computed between the reference and the registered organ positions was achieved." @default.
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• W2121727823 date "2012-05-01" @default.
• W2121727823 modified "2023-10-13" @default.
• W2121727823 title "Robust Real-Time-Constrained Estimation of Respiratory Motion for Interventional MRI on Mobile Organs" @default.
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• W2121727823 doi "https://doi.org/10.1109/titb.2012.2190366" @default.
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