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Proceedings Paper

Reduction of patient dose on medical radiographs using scattered x rays
Author(s): Yoshiyuki Asai; Hitoshi Kanamori; Yoshiaki Ozaki; Atsushi Takigawa; Hideaki Kubota; Masao Matsumoto
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Paper Abstract

We propose a new method for reduction of the patient dose by using scattered X-rays in order to achieve the same density without scattered rays. The minimum perceptible thickness difference (delta) Xmin of the object was calculated using psychophysical analysis for various radiographic densities, scatter fractions and luminous exitances of the viewer. The mAs values to obtain many densities were measured using four kinds of anti-scattered X-ray grid with their scatter fractions. These measured values were applied to above calculated psychophysical results. The smallest value of (delta) Xmin for acrylate of thickness 20cm was 0.18mm, if the scattered X-rays were negligible. The value of (delta) Xmin increases with increasing scatter fraction. The perceptibility of human eye is influenced by luminous exitance of the viewer. By increasing the luminous exitance from 1500 lm(DOT)m-2 to 8000 lm(DOT)m-2, the patient dose can be reduced 33 percent in maximum under the same perceptibility of (delta) Xmin. The method of changing grid will be considered.

Paper Details

Date Published: 18 September 2001
PDF: 6 pages
Proc. SPIE 4549, Medical Image Acquisition and Processing, (18 September 2001); doi: 10.1117/12.440250
Show Author Affiliations
Yoshiyuki Asai, Kinki Univ. Hospital (Japan)
Hitoshi Kanamori, Fukui Univ. of Technology (Japan)
Yoshiaki Ozaki, Kyoto Prefectural Police Headquarters (Japan)
Atsushi Takigawa, Hiroshima Prefectural College of Health Sciences (Japan)
Hideaki Kubota, Osaka Univ. (Japan)
Masao Matsumoto, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4549:
Medical Image Acquisition and Processing
Jayaram K. Udupa; Aaron Fenster, Editor(s)

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