Physical and psychophysical evaluation of a new digital specimen radiography system for use in mammography

Elizabeth A. Krupinski, Hans Roehrig, William Schempp

Research output: Contribution to journalConference articlepeer-review


The goal of this project was to physically and psychophysically evaluate a new digital detector for surgical breast specimen radiography. It is an optical imaging system with a 1K × 1K CCD detector with 24 micron pixels and a 2:1 fiber reducer. Physical evaluation of linearity, noise and spatial resolution were conducted. To measure observer performance, two contrast-detail phantoms were imaged and displayed in four conditions: plain film, CR printed to film, CR displayed on a monitor, and the new digital images displayed on a monitor. Images were acquired at 25 and 30 kV at high, medium and low exposures. 10 observers participated. The system is linear, noise goes as the square-root of exposure, and resolution is in excess of 10 1p/mm. Observer performance was significantly higher with the new digital system (average 74% detections) than all other conditions at all exposure levels, both kVs and for both phantoms (film average 28%, CR film average 61%, CR monitor 50%). The digital specimen radiography system outperformed all other detectors. The system is compact and can easily be used in the operating room. The two versions of the contrast-detail phantoms used in the study are essentially comparable, although some differences were noted.

Original languageEnglish (US)
Pages (from-to)208-215
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2000
EventMedical Imaging 2000: Image Perception and Performance - San Diego, CA, USA
Duration: Feb 16 2000Feb 17 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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