Effects of scattered x-rays on cone-beam CT images

Kohji Inoue; Nobuyuki Nakamori; Hitoshi Kanamori; Masahiro Endo

doi:10.1117/12.174254

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1 May 1994 Effects of scattered x-rays on cone-beam CT images

Kohji Inoue, Nobuyuki Nakamori, Hitoshi Kanamori, Masahiro Endo

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Proceedings Volume 2163, Medical Imaging 1994: Physics of Medical Imaging; (1994) https://doi.org/10.1117/12.174254
Event: Medical Imaging 1994, 1994, Newport Beach, CA, United States

Abstract

Scatter to primary radiation ratios at detector positions were calculated for spherical water phantoms in the cone-beam x-ray 3D CT scanner using the Monte Carlo simulation method. In the Monte Carlo simulation, 1 X 10⁶ photons of cone-beamed 120-kV polyenergetic x-rays with the filter of 4 mm Al have been traced individually as these photons interact within the phantoms with diameters 15 cm and 20 cm. The decrease in CT number due to scatter was found to be about 100. In the process of image reconstruction, the effect of scatter was isolated by applying our new calculation technique. The scatter reduces CT numbers in the whole region of images and the intensity of scattered rays is nearly uniform, so that rounded- off image is reconstructed.

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Kohji Inoue, Nobuyuki Nakamori, Hitoshi Kanamori, and Masahiro Endo "Effects of scattered x-rays on cone-beam CT images", Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); https://doi.org/10.1117/12.174254

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