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Proceedings Paper

Development of a computerized portal verification system for radiation therapy of breast cancers
Author(s): Fang-Fang Yin; Weiwen Lai; Chang Wen Chen; Diana F. Nelson; M. C. Schell; P. Rubin
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Paper Abstract

A fully automated system is being developed for the portal verification of tangential breast fields in radiation therapy of breast cancer. The automated verification system involves image acquisition, image feature extraction, feature correlation between reference and portal images, and quantitative evaluation of patient setup. In this study, the portal images are acquired using a matrix liquid ion-chamber electronic portal imaging device (EPID), and have a matrix size of 256 X 256 pixels with 12-bit gray levels. A hierarchical region processing technique is developed to extract poor contrast features in the portal image generated by megavoltage photon beams at different levels sequentially. The treatment field is initially extracted from the portal image. The skin line is then extracted from the treatment field. Finally, the lung/soft tissue separation is extracted from the breast region. A Chamfer matching filter is used to correlate features in the portal image with those in the reference image. The resulting parameters for rotation, translation and scaling are used for the setup evaluation of the treatment field.

Paper Details

Date Published: 12 May 1995
PDF: 6 pages
Proc. SPIE 2434, Medical Imaging 1995: Image Processing, (12 May 1995); doi: 10.1117/12.208725
Show Author Affiliations
Fang-Fang Yin, Univ. of Rochester (United States)
Weiwen Lai, Univ. of Rochester (United States)
Chang Wen Chen, Univ. of Rochester (United States)
Diana F. Nelson, Univ. of Rochester (United States)
M. C. Schell, Univ. of Rochester (United States)
P. Rubin, Univ. of Rochester (United States)


Published in SPIE Proceedings Vol. 2434:
Medical Imaging 1995: Image Processing
Murray H. Loew, Editor(s)

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