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Proceedings Paper

Optimal display processing for digital radiography
Author(s): Michael J. Flynn; Mary Couwenhoven; William R. Eyler; Bruce R. Whiting; Ehsan Samei; David H. Foos; Richard M. Slone; Edith Marom
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Paper Abstract

Display processing is used to transform digital radiography raw data in log-signal units to display values for presentation using a workstation or film printer. Radiographic appearance with respect to subject latitude and detail contrast varies significantly depending on the signal equalization and grayscale rendition used for processing. A human observer study was conducted to define the latitude and detail contrast that is judged optimal for a broad spectrum of chest radiographs. Raw data for 12 chest radiographs acquired with storage phosphor digital radiography systems were transformed using 52 different combinations of latitude and detail contrast. For specific latitude values, contrast was adjusted by varying the equalization gain. Three radiologists at three different medical centers evaluated the images. Each image was compared to a reference image using a calibrated display on a computer workstation. For PA views, processing that produced a detail contrast of 3.14 ((Delta) D/(Delta) logE) and latitude of 1.47 ((Delta) logE for (Delta) D = 1.75) was determined to be best for all cases and was achieved with an equalization gain of 2.64. For lateral views, a detail contrast of 3.42 and latitude of 1.17 was best for all cases (gain = 2.29). For individual cases, the preferred processing varied from the global average primarily with respect to latitude.

Paper Details

Date Published: 28 May 2001
PDF: 8 pages
Proc. SPIE 4319, Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures, (28 May 2001); doi: 10.1117/12.428068
Show Author Affiliations
Michael J. Flynn, Henry Ford Health System (United States)
Mary Couwenhoven, Eastman Kodak Co. (United States)
William R. Eyler, Henry Ford Health System (United States)
Bruce R. Whiting, Mallinckrodt Institute of Radiology (United States)
Ehsan Samei, Duke Univ. Medical Ctr. (United States)
David H. Foos, Eastman Kodak Co. (United States)
Richard M. Slone, Mallinckrodt Institute of Radiology (United States)
Edith Marom, Duke Univ. Medical Ctr. (United States)

Published in SPIE Proceedings Vol. 4319:
Medical Imaging 2001: Visualization, Display, and Image-Guided Procedures
Seong Ki Mun, Editor(s)

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