Effects of scattered X-rays on CT images
- 1 March 1985
- journal article
- research article
- Published by IOP Publishing in Physics in Medicine & Biology
- Vol. 30 (3), 239-249
- https://doi.org/10.1088/0031-9155/30/3/004
Abstract
Scatter to primary radiation ratios at detector positions were calculated for uniform cylindrical water phantoms in both third and fourth generation X-ray CT scanners using the Monte Carlo simulation method. A rapid method for determining the scattering angle is given. In the process of image reconstruction, the effect of scatter was isolated by applying the authors' new calculation technique. The decrease in CT number due to scatter was found to be less than 10. In the third generation CT scanner the rate of scatter is larger at the centre than at the edge because of the effect of the collimator at the detectors. As a result the cupping artefact occurs in the CT image. The collimator cannot be used in the fourth generation CT scanner and, therefore, the rate of scatter is almost uniform, leading to the appearance of rounded-off edges.This publication has 13 references indexed in Scilit:
- An efficient method of randomly sampling the coherent angular scatter distributionPhysics in Medicine & Biology, 1983
- Compton scatter effects in CT reconstructionsMedical Physics, 1982
- The effects of scatter in x‐ray computed tomographyMedical Physics, 1982
- Scattered radiation in fan beam imaging systemsMedical Physics, 1982
- Monte Carlo simulation studies of detectors used in the measurement of diagnostic x-ray spectraMedical Physics, 1980
- Relativistic atomic form factors and photon coherent scattering cross sectionsJournal of Physical and Chemical Reference Data, 1979
- Compton-scatter tissue densitometry: calculation of single and multiple scatter photon fluencesPhysics in Medicine & Biology, 1978
- The Fourier reconstruction of a head sectionIEEE Transactions on Nuclear Science, 1974
- Liquid Water: Molecular Correlation Functions from X-Ray DiffractionThe Journal of Chemical Physics, 1971
- Three-dimensional Reconstruction from Radiographs and Electron Micrographs: Application of Convolutions instead of Fourier TransformsProceedings of the National Academy of Sciences, 1971