Improving the contrast-to-noise ratio by averaging in scintillation detectors

0466632 - ÚTAM 2017 RIV FR eng A - Abstract
Vopálenský, Michal - Kumpová, Ivana - Vavřík, Daniel
Improving the contrast-to-noise ratio by averaging in scintillation detectors.
IEEE Nuclear Science Symposium and Medical Imaging Conference. Strasbourg: IEEE, 2016.
[2016 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC. 29.10.2016-05.11.2016, Strasbourg]
R&D Projects: GA MŠMT(CZ) LO1219
Keywords : X-ray radiography * scintillation detectors * computed tomography
Subject RIV: AL - Art, Architecture, Cultural Heritage

From the point of view of the image quality, the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) are crucial parameters. In case of the scintillation detectors, which are widely used in X-ray radiography and computed tomography, these two parameters are strongly determined by the inherent noise of the detector and the X-ray beam fluctuation. Both parameters can be lowered by averaging of images from the same projections, but this approach leads to an increased time of the tomography, which can be an undesirable effect. This paper shows a method that allows determination of a minimum number of averaged images for required SNR or CNR based on two initial projections. The results are intended to be used for optimized setting of the detector parameters and X-ray source parameters for a tomography to obtain the best possible results in a reasonable time.
Permanent Link: http://hdl.handle.net/11104/0265101