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Proceedings Paper

Physical and psychophysical evaluation of a new digital specimen radiography system for use in mammography
Author(s): Elizabeth A. Krupinski; Hans Roehrig; William V. Schempp
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Paper Abstract

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 X 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 lp/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.

Paper Details

Date Published: 14 April 2000
PDF: 8 pages
Proc. SPIE 3981, Medical Imaging 2000: Image Perception and Performance, (14 April 2000); doi: 10.1117/12.383112
Show Author Affiliations
Elizabeth A. Krupinski, Univ. of Arizona (United States)
Hans Roehrig, Univ. of Arizona (United States)
William V. Schempp, MedOptics Corp. (United States)

Published in SPIE Proceedings Vol. 3981:
Medical Imaging 2000: Image Perception and Performance
Elizabeth A. Krupinski, Editor(s)

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