Simultaneous acquisition of storage phosphor and asymmetric screen-film chest images using a hybrid cassette

Brent K. Stewart; Carolyn Kimme-Smith; Sandra L. Johnson; Timothy Johnson; Denise R. Aberle

doi:10.1117/12.174287

1 May 1994 Simultaneous acquisition of storage phosphor and asymmetric screen-film chest images using a hybrid cassette

Brent K. Stewart, Carolyn Kimme-Smith, Sandra L. Johnson, Timothy Johnson, Denise R. Aberle

Proceedings Volume 2163, Medical Imaging 1994: Physics of Medical Imaging; (1994) https://doi.org/10.1117/12.174287
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

Abstract

A hybrid cassette has been developed for simultaneous acquisition of storage phosphor and asymmetric screen-film chest images. This is important for the collection of images for Receiver Operating Characteristic studies comparing conventional radiography and computed radiography, without either increased exposure or non-identical imaging conditions. This hybrid radiographic cassette consists of a computed radiography imaging plate (in front) and an intact, high contrast variant of a commercially available asymmetric screen-film system (in the rear) with a speed of approximately 425. The high contrast, speed and efficiency of this screen-film system allow for positioning of the storage phosphor plate in the front of the cassette. As the imaging plate absorption is approximately 35%, the fast screen-film system provides high quality diagnostic images. There is minimal beam hardening, which is ameliorated by the high contrast of the asymmetric front screen. There is minimal differences in the Plexiglas step wedge phantom gray level values for CR and CR-hybrid images and in optical density values for InSight^TM and InSight^TM-hybrid films. The signal to noise ratio of either hybrid image, while fractionally less than their standard counterparts, is negligibly so. Only a slight modification in radiographic technique is required (10%) for use of this hybrid cassette, providing images that are virtually the same as those obtained through the standard CR and InSight^TM ITC imaging methods.

Citation Download Citation

Brent K. Stewart, Carolyn Kimme-Smith, Sandra L. Johnson, Timothy Johnson, and Denise R. Aberle "Simultaneous acquisition of storage phosphor and asymmetric screen-film chest images using a hybrid cassette", Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); https://doi.org/10.1117/12.174287

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KEYWORDS

Chromium

Imaging systems

Radiography

Signal to noise ratio

Chest

Lung

Physics

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