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Proceedings Paper

Measurement and modeling of x-ray scatter using lead discs in digital fluoroscopy
Author(s): Anthony Greaves; Moshi Geso
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Paper Abstract

The lead disc method is a commonly used technique to measure scatter and glare in digital x-ray imaging1,2,3,4, however it is well known that the measurements are dependent upon the size of the disc. A common procedure is to take a series of measurements for a range of disc sizes and to extrapolate them to zero disc size, however the exact technique is not uniform of how this is done. Some use disc radius/diameter as the independent variable with extrapolation, some use non-linear extrapolation, while others use disc area and either linear or non-linear extrapolation. This paper presents a simple geometric model of x-ray scatter based on the ray tracing to calculate an estimate of scatter in the presence of lead discs. Under the experimental conditions used, the model predicted a non-linear relationship with both disc radius and area. A Toshiba mobile surgical x-ray apparatus, model SXT - 6 - 11, was used to measure scatter and glare with different field sizes for a range of disc diameters from 0.17 cm to 12 cm, for 16 cm of lucite. The model was found to be within 2 percent of measured estimates in the case of the 12 cm diameter field of view (FOV) for disc sizes greater than1cm, and greater than 3 cm for the case of the 5 cm FOV.

Paper Details

Date Published: 3 May 2002
PDF: 12 pages
Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); doi: 10.1117/12.465593
Show Author Affiliations
Anthony Greaves, Swinburne Univ. (Australia)
Moshi Geso, RMIT Univ. (Australia)

Published in SPIE Proceedings Vol. 4682:
Medical Imaging 2002: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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