Abstract
The recent development of energy-resolved scintillation crystals opens the way to build novel imaging concepts based on the variable energy. Among them, Compton scattering tomography (CST) is one of the most ambitious concepts. Akin to Computerized Tomography (CT), it consists in probing the attenuation map of an object of interest using external ionizing sources but strives to exploit the scattered radiation as an imaging agent. For medical applications, the scattered radiation represents 70 to 80% when the energy of the source is larger than 100 keV and results from the Compton effect. This phenomenon stands for the collision of a photon with an electron and rules the change of course and loss of energy undergone by the photon. In this article, we propose a modeling for the scattered radiation assuming polychromatic sources such as 60Co and scintillation crystals such as LBC:Ce. Further, we design a general strategy for reconstructing the electron density of the target specimen. Our results are illustrated for toy objects.
Highlights
Invented and theorized by the Nobel medal award-winners G
One can mention Single Photon Emission Computerized Tomography (CT) (SPECT), Positron Emission Tomography (PET) and Cone-Beam CT for the imaging systems based on an ionizing source
Neglecting Thomson–Rayleigh scattering and the pair production, we focus on the Compton scattering to interpret our data and decompose the spectrum Spec(E, s, d) measured at a detector d with energy E as follows
Summary
Invented and theorized by the Nobel medal award-winners G. We intend to focus instead on the phenomenon of Compton scattering which enables a modeling of the energetic data in terms of electron density and for corresponding emission energies, see [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36] The purpose of this communication is to validate the possibility to use scintillation crystals and their energetic sensitivity in a fan-beam CT scan from a bichromatic ionizing source (here the Cobalt-60). The validation of our approach with the properties of the LBC:Ce scintillators motivates the potential of the imaging system in particular with better resolved crystals or semiconductor detectors such as CZT (CdZnTe) [37]
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