Figure 1.

Flow of the OAR delineation QA tool. The open arrowhead (⇾) represents preparation and generation of the QA tool, the solid arrowhead (→) represents the QA procedure of a new OAR delineation. The reference OAR set is initialized with historic OAR delineations. A parameterized distribution of each volumetric feature is used to establish the statistical inference test. The multicriteria outlier detection system is developed from the parametric distributions in the initial reference. The QA procedure starts with calculation of the volumetric features, followed by the inference test to identify deviated features. The outlier detection system reports delineation abnormalities if detected. After finalizing, the newly approved OAR delineation will be included in the OAR reference for future QA procedures. [Color figure can be viewed at wileyonlinelibrary.com]