title: Distance deviation measure of contouring variability.
abstract: BACKGROUND
  Several methods that are currently used for contouring analysis have problems providing reliable and/or meaningful results. In this paper a solution to these problems is proposed in a form of a novel measure, which was developed based on requirements defined for contouring studies.
  
  
  METHODS
  The proposed distance deviation measure can be understood as an extension of the closest point measures in such a way that it does not measure only distances between points on contours but rather analyse deviation of distances to both/all contours from each image point/voxel. The obtained result is information rich, reliable and provided in a form of an image, enabling detailed topographic analysis. In addition to image representation, results can be further processed into angular representation for compact topographic analysis or into overall scalar estimates for quick assessment of contour disagreement.
  
  
  RESULTS
  Distance deviation method is demonstrated on a multi observer contouring example with complex contour shapes, i.e., with pronounced extremes and void interior. The results are presented using the three proposed methods.
  
  
  CONCLUSIONS
  The proposed method can detect and measure contour variation irrespective of contour complexity and number of contour segments, while the obtained results are easy to interpret. It can be used in various situations, regarding the presence of reference contour or multiple test contours.
authors: Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Koper, Slovenia.
authors: Peter
authors: P
authors: Rogelj
authors: Robert
authors: R
authors: Hudej
authors: Primoz
authors: P
authors: Petric
keywords: contour comparison; contouring; distance transform