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Proceedings Paper

Fast algorithm for radiation field edge detection
Author(s): Georgi J. Gluhchev; Shlomo Shalev
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Paper Abstract

The efficacy of radiation treatment depends strongly on the accuracy of the treatment field set up. On-line portal imaging provides the possibility of detecting and correcting field placement errors before a significant radiation dose is delivered. A heuristic algorithm is described for fast field contour delineation based on the properties of the portal images, and its accuracy and reproducibility are tested on a number of artificial and real images. Its speed depends on the size of the field and varies between 0.1 s and 0.3 s for 480 X 512 pixel images for implementation on a PC-386 computer. A correction is proposed for local distortions in the contour line based on an estimation of the oriented curvature. Experimental results with real portal images demonstrate the reliability of the approach and its suitability for clinical implementation.

Paper Details

Date Published: 14 September 1993
PDF: 8 pages
Proc. SPIE 1898, Medical Imaging 1993: Image Processing, (14 September 1993); doi: 10.1117/12.154514
Show Author Affiliations
Georgi J. Gluhchev, Manitoba Cancer Treatment and Research Foundation (Canada)
Shlomo Shalev, Manitoba Cancer Treatment and Research Foundation and Univ. of Manitoba (Canada)

Published in SPIE Proceedings Vol. 1898:
Medical Imaging 1993: Image Processing
Murray H. Loew, Editor(s)

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