Quantitative evaluation of CT Images by means of Shannon Entropy
| Autor: | Richard Schielein Stefan Schröpfer Markus Kiunke Simon Zabler Stefan Kasperl |
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| Rok vydání: | 2014 |
| Popis: | Scattering of high energetic X ray photons causes artefacts in industrial computed tomography (CT). For MeV photons the interaction cross sections for scattering processes dominate those of the photoelectric effect and electron positron pair formation is enabled. In this paper the effect of scattering processes on the distribution of the absorbed energy in a linear detector is examined as a model for a transmission image. To separate contributions of the different interaction processes Monte Carlo simulations are performed based on the GEANT4 framework. This study focuses on the simulation of primitive objects such as boxes or cylinders of different materials as well as simplified models for the components of a CT system to examine the contribution of scattering by system components. In particular our results indicate that with the help of detector collimation a reduction of the scattering contribution up to a factor of 2 can be achieved. |
| Databáze: | OpenAIRE |
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