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1 May 1994 Effects of scattered x-rays on cone-beam CT images
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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