Reduction of patient dose on medical radiographs using scattered x rays

Yoshiyuki Asai; Hitoshi Kanamori; Yoshiaki Ozaki; Atsushi Takigawa; Hideaki Kubota; Masao Matsumoto

doi:10.1117/12.440250

18 September 2001 Reduction of patient dose on medical radiographs using scattered x rays

Yoshiyuki Asai, Hitoshi Kanamori, Yoshiaki Ozaki, Atsushi Takigawa, Hideaki Kubota, Masao Matsumoto

Proceedings Volume 4549, Medical Image Acquisition and Processing; (2001) https://doi.org/10.1117/12.440250
Event: Multispectral Image Processing and Pattern Recognition, 2001, Wuhan, China

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) X_min 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) X_min for acrylate of thickness 20cm was 0.18mm, if the scattered X-rays were negligible. The value of (delta) X_min 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) X_min. The method of changing grid will be considered.

Citation Download Citation

Yoshiyuki Asai, Hitoshi Kanamori, Yoshiaki Ozaki, Atsushi Takigawa, Hideaki Kubota, and Masao Matsumoto "Reduction of patient dose on medical radiographs using scattered x rays", Proc. SPIE 4549, Medical Image Acquisition and Processing, (18 September 2001); https://doi.org/10.1117/12.440250

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