<abstract xmlns="http://www.w3.org/1999/xhtml"> 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. Materials and 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, <italic>i.e</italic>., 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.</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. Materials and 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.

Distance deviation measure of contouring variability

Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška 8, SI-6000, Koper, Slovenia

Institute of Oncology Ljubljana, Ljubljana Slovenia

Radiology and Oncology

{"article-title":"Distance deviation measure of contouring variability"}

Background. Several methods that are currently used for contouring analysis have problems providing reliable and/ or meaningful results. In this paper a...

Distance deviation measure of contouring variability

Published Online: Feb 01, 2013

Page range: 86 - 96

DOI: https://doi.org/10.2478/raon-2013-0005

Keywords
contouring, contour comparison, distance transform

This content is open access.

Distance deviation measure of contouring variability

Published Online: Feb 01, 2013

Page range: 86 - 96

DOI: https://doi.org/10.2478/raon-2013-0005

Keywordscontouring, contour comparison, distance transform

This content is open access.

Keywords
contouring, contour comparison, distance transform