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A comparison of rigid registration methods for prostate localization on CBCT and the dependence on rectum distension

Abstract : We evaluated automatic three-dimensional intensity-based rigid registration (RR) methods for prostate localization on CBCT scans and studied the impact of rectum distension on registration quality. 106 CBCT scans of 9 prostate patients were used. Each one was registered to the planning computed tomography (CT) scan using different methods: (a) global registration, (b) pelvis bony structure registration, (c) bony registration refined by a local prostate registration using the CT clinical target volume (CTV) expanded with 1, 3, 5, 8, 10, 12, 15 or 20-mm margin. Automatic CBCT contours were generated after propagation of the manual CT contours. To evaluate results, a radiation oncologist was asked to manually delineate the CTV on the CBCT scans (gold standard). The Dice similarity coefficients between propagated and manual CBCT contours were calculated.
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Christine Boydev, David Pasquier, Foued Derraz, Laurent Peyrodie, Abdelmalik Taleb-Ahmed, et al.. A comparison of rigid registration methods for prostate localization on CBCT and the dependence on rectum distension. Journal of Physics: Conference Series, IOP Publishing, 2014, 489 (1), pp.012025. ⟨10.1088/1742-6596/489/1/012025⟩. ⟨hal-03470239⟩

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