Reducing beam hardening effects and metal artefacts in spectral CT using Medipix3RX

Rajendran, K
Walsh, MF
de Ruiter, NJA
Chernoglazov, AI
Panta, RK
Butler, APH
Butler, PH
Bell, ST
Anderson, NG
Woodfield, TBF
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Journal Article
Fields of Research
ANZSRC::020203 Particle Physics , ANZSRC::11 Medical and Health Sciences , ANZSRC::40 Engineering , ANZSRC::51 Physical sciences
This paper discusses methods for reducing beam hardening effects and metal artefacts using spectral x-ray information in biomaterial samples. A small-animal spectral scanner was operated in the 15 to 80 keV x-ray energy range for this study. We use the photon-processing features of a CdTe-Medipix3RX ASIC in charge summing mode to reduce beam hardening and associated artefacts. We present spectral data collected for metal alloy samples, its analysis using algebraic 3D reconstruction software and volume visualisation using a custom volume rendering software. The cupping effect and streak artefacts are quantified in the spectral datasets. The results show reduction in beam hardening effects and metal artefacts in the narrow high energy range acquired using the spectroscopic detector. A post reconstruction comparison between CdTe-Medipix3RX and Si-Medipix3.1 is discussed. The raw data and processed data are made available ( for testing with other software routines.
© CERN 2014, published under the terms of the Creative Commons Attribution 3.0 License by IOP Publishing Ltd and Sissa Medialab srl. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI.
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