Port Film Enhancement By Digital Processing

S. Shalev; C- W . Cheng; J. Arenson

doi:10.1117/12.949482

19 September 1985 Port Film Enhancement By Digital Processing

S. Shalev, C- W . Cheng, J. Arenson

Proceedings Volume 0555, Medical Imaging and Instrumentation '85; (1985) https://doi.org/10.1117/12.949482
Event: Medical Imaging and Instrumentation '85, 1985, Boston, United States

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.

Citation Download Citation

S. Shalev, C- W . Cheng, and J. Arenson "Port Film Enhancement By Digital Processing", Proc. SPIE 0555, Medical Imaging and Instrumentation '85, (19 September 1985); https://doi.org/10.1117/12.949482

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