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

K. Rajendran, M. F. Walsh, N. J.A. De Ruiter, A. I. Chernoglazov, R. K. Panta, A. P.H. Butler, P. H. Butler, S. T. Bell, N. G. Anderson, T. B.F. Woodfield, S. J. Tredinnick, J. L. Healy, C. J. Bateman, R. Aamir, R. M.N. Doesburg, P. F. Renaud, S. P. Gieseg, D. J. Smithies, J. L. Mohr, V. B.H. MandalikaA. M.T. Opie, N. J. Cook, J. P. Ronaldson, S. J. Nik, A. Atharifard, M. Clyne, P. J. Bones, C. Bartneck, R. Grasset, N. Schleich, M. Billinghurst

Research output: Contribution to journalArticlepeer-review

Abstract

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 (http://hdl.handle.net/10092/8851) for testing with other software routines.

Original languageEnglish (US)
Article numberP03015
JournalJournal of Instrumentation
Volume9
Issue number3
DOIs
StatePublished - Mar 2014

Keywords

  • Computerized Tomography (CT) and Computed Radiography (CR)
  • Medical-image reconstruction methods and algorithms, computer-aided diagnosis
  • X-ray detectors

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation

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