Fig. 2From: Methodology for analysis and reporting patterns of failure in the Era of IMRT: head and neck cancer applicationsClassification scheme of IMRT patterns of failure using combined centroid based geometric method coupled with the dosimetric parameters. Panel a) shows an example of types A (central high dose) and C (central elective dose) failures, panel b) shows an example of types B (peripheral high dose) and D (peripheral elective dose) failures, and panel c) shows an example of type E (extraneous dose) failure.Back to article page