Model-based Segmentation and Image Fusion of 3D Computed Tomography and 3D Ultrasound of the Eye for Radiotherapy PlanningReportar como inadecuado




Model-based Segmentation and Image Fusion of 3D Computed Tomography and 3D Ultrasound of the Eye for Radiotherapy Planning - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Presented at: VIPIMAGE, Porto, Portugal, October 14-16, 2009 Published in: Second ECCOMAS Thematic Conference on Computational Vision and Medical Image Processing, p. 53-58 : , 2009

For radiotherapy treatment planning of retinoblastoma in childhood, Computed Tomography (CT) represents the standard method for tumor volume delineation, despite some inherent limitations. CT scan is very useful in providing information on physical density for dose calculation and morphological volumetric information but presents a low sensitivity in assessing the tumor viability. On the other hand, 3D ultrasound (US) allows a high accurate definition of the tumor volume thanks to its high spatial resolution but it is not currently integrated in the treatment planning but used only for diagnosis and follow-up. Our ultimate goal is an automatic segmentation of gross tumor volume (GTV) in the 3D US, the segmentation of the organs at risk (OAR) in the CT and the registration of both. In this paper, we present some preliminary results in this direction. We present 3D active contour-based segmentation of the eye ball and the lens in CT images; the presented approach incorporates the prior knowledge of the anatomy by using a 3D geometrical eye model. The automated segmentation results are validated by comparing with manual segmentations. Then, for the fusion of 3D CT and US images, we present two approaches: (i) landmark-based transformation, and (ii) object-based transformation that makes use of eye ball contour information on CT and US images.

Keywords: LTS5 ; Segmentation ; Active contours ; Multimodal imaging ; 3D Ultrasound imaging ; Radiotherapy planning ; Radiotherapy Reference EPFL-CONF-138683





Autor: Bach Cuadra, Meritxell; Gorthi, Subrahmanyam; Karahanoglu, F. I.; Salvador, F.; Pica, A.; Do, H.P.; Balmer, A.; Munier, F.; Thiran

Fuente: https://infoscience.epfl.ch/record/138683?ln=en







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