New “improved” Compton scatter tomography modality for investigative imaging of one-sided large objects

Abstract

In an effort to promote Compton scatter tomography (CST) as an adequate modality for imaging the inner parts of large objects limited in a half-space of R 3 AQ1, we show that the standard CST can be 'improved' in some particular sense by 'doubling' the scanning mechanism. To this end, one needs to record for each position of a detector the scattered flux densities at two energies of scattered radiation, instead of one. Curiously, thanks to geometric inversion, this 'double' scanning may be converted into a transmission scanning on an apparent object, not along a straight line path as usual, but along a folded line in the shape of a V -line path. It has been proved that this V -line transmission scanning admits a well-defined reconstruction procedure. Therefore, the proposed CST with 'double' scanning, which solves the above imaging inverse problem, shows an 'improved' reconstructed image as compared to the standard one. We present theoretical arguments to support this claim as well as numerical simulations to illustrate its working and its viability AQ2 . ARTICLE HISTORY

Analytical reconstruction formula with efficient implementation for a modality of Compton scattering tomography with translational geometry

“…Thus, first order Compton scattering is the only source of attenuation for radiation and data acquisition is performed with a pair source detector, assumed to be point-like. These conditions are common in the literature[18,35,36,3,31,29,27] and have been already discussed in[19,33,35,27].…”

An analytical reconstruction formula with efficient implementation for a modality of Compton Scattering Tomography with translational geometry

“…Thus, first order Compton scattering is the only source of attenuation for radiation and data acquisition is performed with a pair source detector, assumed to be point-like. These conditions are common in the literature[16,26,29,30,31,20,24] and have been already discussed in[15,19,26,24].…”

On a three-dimensional Compton scattering tomography system with fixed source

“…Transmission Compton scatter tomography consists in illuminating the object under study with a source of radiation and registering the scattered photons in the neighborhood of the object. The interest in this technique is supported by its numerous potential applications namely non-destructive testing, homeland security and the study of composite materials used in aircraft industry [2,3]. Recent works in medical imaging suggest possible advantages in diagnosis since images exhibit better contrast in certain scenarios such as lung tumors [4,5].…”

“…Depending on the setup, forward models are based on integral transforms on different manifolds. When collimated detectors are used, manifolds are circular arcs [1,9,10,11,12,13] or pairs of circular arcs [2]. When collimator is removed from detectors, manifolds are toric sections [3,14].…”