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Proceedings Paper

Port Film Enhancement By Digital Processing
Author(s): S. Shalev; C- W . Cheng; J. Arenson
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Paper Abstract

Port films are routinely exposed during radiotherapy treatment to verify correct patient positioning. Contrast is always poor, due to the high energy of the radiation, and spatial resolution is seriously degraded by scatter and large penumbra. We place port films on an illuminated panel facing a vidicon camera, and obtain digitized images for processing in our DICOM-8 digital imaging computer. Averaging up to 256 frames reduces camera noise. Convolution filtering, windowing, histogram equalization and blurred mask subtraction lead to significant improvement in the perception of anatomical structures. Digitization of the x-ray simulator film, using real-time subtraction for accurate alignment, permits the direct comparison of the actual field size with the prescribed treatment area.

Paper Details

Date Published: 19 September 1985
PDF: 6 pages
Proc. SPIE 0555, Medical Imaging and Instrumentation '85, (19 September 1985); doi: 10.1117/12.949482
Show Author Affiliations
S. Shalev, Manitoba Cancer Treatment and Research Foundation (Canada)
C- W . Cheng, Manitoba Cancer Treatment and Research Foundation (Canada)
J. Arenson, Manitoba Cancer Treatment and Research Foundation (Canada)

Published in SPIE Proceedings Vol. 0555:
Medical Imaging and Instrumentation '85
James A. Mulvaney, Editor(s)

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