Feasibility of automated matching of supine and prone CT-colonography examinations.
Br J Radiol
; 79(945): 740-4, 2006 Sep.
Article
in En
| MEDLINE
| ID: mdl-16641418
ABSTRACT
Matching of prone and supine positions in CT colonography may improve accuracy of polyp detection. The purpose of this study was to investigate the feasibility of automatic prone-supine matching in CT-colonography using proven polyps as fixed points of reference. The method is based on similarities in the direction of centre-lines and allows for compression and extraction of the centre-lines in both positions. To illustrate the impact of the match error of the new method in practice, the visibility of the matched polyps in a primary three-dimensional unfolded cube setting was determined as well. The method was compared with a method that relies on the normalized distance along the centre-line (NDAC method). The median absolute match error was 14 mm (range 0-59 mm, average 20 mm) either proximal or distal from the actual polyp in prone position. In the observer study, 70% (26/37) of the polyps were directly visible in prone view. The overall difference in median absolute match error between both methods was small (2 mm), although half way along the centre-line there were polyps with substantial differences in match error (larger with NDAC). We concluded that automated prone-supine matching of CT-colonography studies is feasible and has a low match error. The difference with the NDAC method was small and not significant, although half way along the centre-line some differences were seen.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Colonic Polyps
/
Colonography, Computed Tomographic
Type of study:
Evaluation_studies
Limits:
Humans
Language:
En
Journal:
Br J Radiol
Year:
2006
Document type:
Article
Affiliation country:
Netherlands