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Proceedings Paper

Evaluation of a selenium-based digital chest radiography system
Author(s): Carey E. Floyd; Harrell G. Chotas; Carl E. Ravin
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Paper Abstract

Preliminary results are presented from an examination of a selenium based thoracic radiography system (Philips Thoravision). The system has been evaluated with four criteria: (1) systems repeatability, (2) digital linearity, (3) spatial resolution, and (4) scattered photon detection fractions. Phantoms were imaged at 120 kV. Repeatability was measured using a polystyrene phantom and evaluating the mean exposure value detected in a region of interest over a period of time. Digital linearity was examined by plotting the output digital value as a function of input exposure. Resolution was evaluated using a line pair phantom. To measure scatter fractions, an anthropomorphic phantom was exposed with a superimposed array of lead beam stops. Three configurations were examined: (1) the selenium system (including an air gap), (2) the system with an added 12:1 antiscatter grid, and (3) a photostimulable phosphor system (Philips PCR) for reference. For a 4 day interval, output varied less than 1%. Digital output of the system was linear with exposure (regression Rvalue of 0.998) over the range from 0.2 mR to 10 mR. The system resolved 2.5 line pair per mm. Resolution was comparable to phosphor plate systems. Scatter fractions were improved when a grid was included.

Paper Details

Date Published: 1 May 1994
PDF: 7 pages
Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); doi: 10.1117/12.174246
Show Author Affiliations
Carey E. Floyd, Duke Univ. Medical Ctr. (United States)
Harrell G. Chotas, Duke Univ. Medical Ctr. (United States)
Carl E. Ravin, Duke Univ. Medical Ctr. (United States)


Published in SPIE Proceedings Vol. 2163:
Medical Imaging 1994: Physics of Medical Imaging
Rodney Shaw, Editor(s)

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