Development of a novel high-contrast cassette/film/screen system for radiation therapy portal localization imaging

Robert E. Dickerson; Arthur G. Haus; Kenneth E. Huff

doi:10.1117/12.274024

2 May 1997 Development of a novel high-contrast cassette/film/screen system for radiation therapy portal localization imaging

Robert E. Dickerson, Arthur G. Haus, Kenneth E. Huff

Author Affiliations +

Proceedings Volume 3032, Medical Imaging 1997: Physics of Medical Imaging; (1997) https://doi.org/10.1117/12.274024
Event: Medical Imaging 1997, 1997, Newport Beach, CA, United States

Abstract

Radiation therapy portal images have traditionally exhibited poor discrimination of areas of interest, due to low subject contrast of anatomical parts being imaged at megavoltage energies, and the contrast capabilities of the image receptors. As a result of this low contrast, positioning of the radiation beam and placement of shielding blocks can be difficult. A novel, high-contrast cassette/film/screen system has ben developed and clinically evaluated for portal imaging. This system features a copper front screen, a gadolinium oxysulfide, terbium activated intensifying screens and a slow speed film with inherently high contrast. Very high film contrast is achieved by narrow grain size distribution and metal ion doping of the silver halide microcrystals. This high-contrast film is exposed by light from the intensifying screen, further increasing contrast. Sensitometric data indicates this new system to have 3.5X greater contrast than conventional portal localization imaging systems at comparable monitor units. Initial clinical evaluation indicates this new system to yield significantly superior images showing clearer definition of structures and was much easier to read and interpret.

Citation Download Citation

Robert E. Dickerson, Arthur G. Haus, and Kenneth E. Huff "Development of a novel high-contrast cassette/film/screen system for radiation therapy portal localization imaging", Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997); https://doi.org/10.1117/12.274024

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