Threshold perception performance with computed and screen-film radiography: implications for chest radiography.

Journal Article (Journal Article)

Images of a phantom obtained with computed radiography and standard screen-film imaging were compared to evaluate observer threshold perception performance with a modified contrast-detail technique. Optimum exposure necessary for performance with the imaging plate technique to match that with screen-film techniques was determined, as was comparative performance with variation in kilovoltages, plate type, spatial enhancement, and hard-copy interpolation method. It was found that computed radiography necessitates about 75%-100% more exposure than screen-film radiography to optimally match performance with Ortho-C film with Lanex regular or medium screens (Eastman Kodak, Rochester, NY) for detection of objects 0.05-2.0 cm in diameter. However, only minimal loss of detection performance (approximately 10% overall) was experienced if standard screen-film exposures were used with computed radiography. Little change in observer performance was found with variation in plate type, spatial enhancement, or method of hard-copy interpolation. However, perception performance with computed radiographic images was better at lower kilovoltages.

Full Text

Duke Authors

Cited Authors

  • Dobbins, JT; Rice, JJ; Beam, CA; Ravin, CE

Published Date

  • April 1992

Published In

Volume / Issue

  • 183 / 1

Start / End Page

  • 179 - 187

PubMed ID

  • 1549669

International Standard Serial Number (ISSN)

  • 0033-8419

Digital Object Identifier (DOI)

  • 10.1148/radiology.183.1.1549669


  • eng

Conference Location

  • United States