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Proceedings Paper

Dynamic contour model for aligning and segmenting OCT B-scans
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Paper Abstract

Aligning A-scans from OCT B-scan images are of relevance in a number of applications. One important case is when producing an average A-scan profile over a given sample region to suppress the speckle noise in the reflectance profile. From fitting the average A-scan curve to a mathematical model one can then extract optical parameters, from which it might be possible for instance to discriminate between healthy and pathologic tissue. Aligning B-scans may also be appropriate in order to present OCT images in a visually consistent way appropriate for comparison between corresponding images such as OCT images of the retinal layers. Alignment is most often based on tracking the position of the boundary curve that has to be aligned. Carrying out this tracking manually is tedious when dealing with many images and it is more desirable to perform it using image-tracking algorithms. Dynamic contour models or image snakes are appropriate tools for carrying out this task. We illustrate the use of dynamic programming implementations for contour tracking and subsequent alignment and compare with the result of doing the tracking by hand. In addition we illustrate the use of contour tracking for measuring the thickness of the nerve fiber layer in retinal OCT images. With the illustrated algorithms we have produced software modules for assisting medical doctors in handling the OCT data obtained using commercial equipment.

Paper Details

Date Published: 13 April 2005
PDF: 6 pages
Proc. SPIE 5690, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine IX, (13 April 2005); doi: 10.1117/12.592715
Show Author Affiliations
Thomas Martini Jorgensen, Riso National Lab. (Denmark)
Jakob Thomadsen, Riso National Lab. (Denmark)
Lars Thrane, Riso National Lab. (Denmark)
Peter Eskil Andersen, Riso National Lab. (Denmark)

Published in SPIE Proceedings Vol. 5690:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine IX
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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