Item – Theses Canada

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OCLC number
46528420
Author
Wang, Hui,1964-
Title
Automatic image segmentation and correlation in radiotherapy verification.
Degree
M. Sc. -- McGill University, 1993
Publisher
Ottawa : National Library of Canada = Bibliothèque nationale du Canada, 1994.
Description
1 microfiche.
Notes
Includes bibliographical references.
Abstract
Two active topics in radiation therapy treatment verification, portal image segmentation and correlation, are addressed, and a robust algorithm for automatic segmentation of portal images and portal image registration with respect to a reference image is developed. Morphological techniques have been intensively applied in all stages of the segmentation part of this algorithm, from edge detection to feature extraction. An important issue, edge enhancement, is discussed particularly in detail. The performance of the morphological edge detection technique on portal images is compared with that of local gradient operators and optimal edge detectors, while the advantage of the morphological edge detection and segmentation techniques is justified. The treatment field mask is proposed as the landmark for portal-simulator image correlation achieved by matching inertia moments of landmarks. The effect of two different landmarks, the treatment field mask and the treatment field contour, is examined with this correlation method, and the superiority of using the treatment field mask is shown.
ISBN
0315918152
9780315918153