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• W2166176455 abstract "In nowadays prostate interstitial brachytherapy, transrectal ultrasound guidance is typically used to localize the prostate and the rectum. However, the ability of ultrasound to distinct normal from cancer tissues is weak. In most treatments, the organ as a whole is thus irradiated, leading to numerous side effects such as urinary or sexual dysfunction. The quality of magnetic resonance images (MRI), on the other hand, has improved over the last few years and allows for an accurate delineation of the tumor [1]. This paper proposes a novel framework for MRI-US surface registration of the prostate and the rectum. The preoperative MRI is first segmented using a multiresolution graph-cut method. The intraoperative US image is manually segmented by the surgeon. The registration is then performed in two steps. In a first step, a bi-affine registration is performed on the surfaces of the rectum and the prostate using an expectation maximization iterative closest point method (EM-ICP). In the second step, non-rigid registration is applied to the distance maps resulting from the pre-registered surfaces. Our approach has been applied on 5 MR/US pairs and shows a relative independence between prostate and rectum motions." @default.
• W2166176455 created "2016-06-24" @default.
• W2166176455 creator A5014165192 @default.
• W2166176455 date "2012-03-01" @default.
• W2166176455 modified "2023-09-26" @default.
• W2166176455 title "Diffeomorphic surface-based registration for MR-US fusion in prostate brachytherapy" @default.
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• W2166176455 doi "https://doi.org/10.1109/melcon.2012.6196575" @default.
• W2166176455 hasPublicationYear "2012" @default.
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