Correction procedure for the self-absorption artifacts in x-ray Compton tomography

Antonio Brunetti; Bruno Golosio; Roberto Cesareo; Cesare Cappio Borlino

doi:10.1117/12.452859

7 January 2002 Correction procedure for the self-absorption artifacts in x-ray Compton tomography

Antonio Brunetti, Bruno Golosio, Roberto Cesareo, Cesare Cappio Borlino

Proceedings Volume 4503, Developments in X-Ray Tomography III; (2002) https://doi.org/10.1117/12.452859
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Transmission tomography is a powerful tool in several fields of investigation, ranging from medicine to industrial quality control. It is based on the radiation that doesn't interact with the sample and that reaches the detector. However, this kind of technique cannot always be used or the information from it is poor. In some of these cases other kinds of tomography can be applied such as scattering (Compton or Rayleigh) tomography or fluorescence tomography. The use of the latter techniques requires a different reconstruction technique of that used in transmission tomography. Some adaptation of the backprojection algorithm is often used, but in this case a complete scan of the sample is required with a fixed geometry. Another type of reconstruction algorithms are the iterative ones, but they present a high computational cost and so only small, low spatial resolution matrix, can be treated. In the past another kind of scanning techniques has been proposed. It is based on two linear translations (x-y) against translation and rotation required by the backprojection algorithm. The x-y scanning presents a big advantage compared with the backprojection scanning, i.e. the reconstruction does not need to be performed on the whole sample; it can also be performed on a part of the sample, the region of interest (ROI). However this scanning technique is affected by a big drawback: the influence of x-ray self-absorption by the matrix is stronger than the backprojection scanning producing a lower quality of the reconstruction. In this paper a recently developed correction technique is described.

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Antonio Brunetti, Bruno Golosio, Roberto Cesareo, and Cesare Cappio Borlino "Correction procedure for the self-absorption artifacts in x-ray Compton tomography", Proc. SPIE 4503, Developments in X-Ray Tomography III, (7 January 2002); https://doi.org/10.1117/12.452859

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KEYWORDS

Tomography

Chemical elements

X-rays

Reconstruction algorithms

Sensors

Collimation

Fluorescence tomography

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