A Detailed Monte Carlo Study of Multiple Scattering Contamination in Compton Tomography at 90

A low dose technique has been recently proposed for tomographic studies of the lung, which makes use of a gamma camera to detect 90° Compton-scattered photons from external planar gamma source. In this paper, we present a detailed Monte Carlo study of this technique. A 20 × 20 × 20 cm3 water phantom...

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Veröffentlicht in:	IEEE transactions on medical imaging 1982-10, Vol.1 (2), p.147-152
Hauptverfasser:	Del Guerra, Alberto, Bellazzini, Ronaldo, Tonelli, Guido, Venturi, Renzo, Nelson, Walter R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Cameras Contamination Electromagnetic scattering Gamma ray detection Gamma ray detectors Imaging phantoms Lungs Monte Carlo methods Particle scattering Tomography
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creator	Del Guerra, Alberto Bellazzini, Ronaldo Tonelli, Guido Venturi, Renzo Nelson, Walter R.
description	A low dose technique has been recently proposed for tomographic studies of the lung, which makes use of a gamma camera to detect 90° Compton-scattered photons from external planar gamma source. In this paper, we present a detailed Monte Carlo study of this technique. A 20 × 20 × 20 cm3 water phantom was simulated as a target and a large gamma camera equipped with an imaging collimator as a detector. The multiple scattering contamination of the single scattered signal was studied as a function of the source-detector geometry and of the incident energy in the range 100-500 keV. The multiple to single scatter ratio has an approximate 1/E0.7 dependence and increases almost linearly with the phantom depth and the transversal thickness at 90°. Simulation has been also performed with a 16 × 16 × 10 cm3 sawdust phantom of 0.3 g/cm3 density; the Monte Carlo results agree to within a few percent with experimental data.
doi_str_mv	10.1109/TMI.1982.4307562
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In this paper, we present a detailed Monte Carlo study of this technique. A 20 × 20 × 20 cm3 water phantom was simulated as a target and a large gamma camera equipped with an imaging collimator as a detector. The multiple scattering contamination of the single scattered signal was studied as a function of the source-detector geometry and of the incident energy in the range 100-500 keV. The multiple to single scatter ratio has an approximate 1/E0.7 dependence and increases almost linearly with the phantom depth and the transversal thickness at 90°. 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In this paper, we present a detailed Monte Carlo study of this technique. A 20 × 20 × 20 cm3 water phantom was simulated as a target and a large gamma camera equipped with an imaging collimator as a detector. The multiple scattering contamination of the single scattered signal was studied as a function of the source-detector geometry and of the incident energy in the range 100-500 keV. The multiple to single scatter ratio has an approximate 1/E0.7 dependence and increases almost linearly with the phantom depth and the transversal thickness at 90°. Simulation has been also performed with a 16 × 16 × 10 cm3 sawdust phantom of 0.3 g/cm3 density; the Monte Carlo results agree to within a few percent with experimental data.</abstract><pub>IEEE</pub><pmid>18238268</pmid><doi>10.1109/TMI.1982.4307562</doi><tpages>6</tpages></addata></record>
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subjects	Cameras Contamination Electromagnetic scattering Gamma ray detection Gamma ray detectors Imaging phantoms Lungs Monte Carlo methods Particle scattering Tomography
title	A Detailed Monte Carlo Study of Multiple Scattering Contamination in Compton Tomography at 90
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