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Proceedings Paper

Effects of scattered x-rays on cone-beam CT images
Author(s): Kohji Inoue; Nobuyuki Nakamori; Hitoshi Kanamori; Masahiro Endo
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Paper 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.

Paper Details

Date Published: 1 May 1994
PDF: 8 pages
Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); doi: 10.1117/12.174254
Show Author Affiliations
Kohji Inoue, Kyoto Institute of Technology (Japan)
Nobuyuki Nakamori, Kyoto Institute of Technology (Japan)
Hitoshi Kanamori, Kyoto Institute of Technology (Japan)
Masahiro Endo, National Institute of Radiological Science (Japan)


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

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