Welcome to the H&N auto-segmentation challenge 2009 website. This competition is part of the workshop 3D Segmentation Challenge for Clinical Applications, in conjunction with MICCAI 2009 (in continuation of the MICCAI 2007 and 2008 workshops "3D Segmentation in the Clinic: a Grand Challenge"). The goal of this competition is to quantitatively compare fully automatic methods for segmenting anatomical structures in head and neck CT data, such as mandible and brainstem. The data for this challenge is provided by the Princess Margaret Hospital, Toronto. It stems from a context of radiation therapy planning which requires high delineation accuracy. Challenge Results are now available online More (new) information is available in the About section. More will be in the answers to frequently asked questions. You may also want to visit the website for the Carotid Segmentation in CT, Prostate Tracking in MR, and Left Ventricle Segmentation in MR competitions, which are also part of the workshop mentioned above. The content of this website is copyrighted © 2009 Vladimir Pekar, John Kim, Stéphane Allaire, David A. Jaffray