Wadeson, Nicola (2015) Aluminium foam data reconstruction using CGLS and TV Regularisation - 100 and 200 projection data. [MIMS Preprint]

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Abstract

The Henry Mosely X-ray Imaging Facility (HMXIF) is a suite of x-ray imaging systems located at the University of Manchester in the School of Materials Science. Most commercial x-ray CT machines provide an in-built variant of the filtered back-projection (FBP) algorithm as standard. These algorithms are fast and accurate but have specific requirements in terms of ray sampling and can lead to streak artifacts in the background of the reconstructed image, creating difficulties during image segmentation. Algebraic reconstruction algorithms are largely over-looked due to lower accuracy, slow speed and large memory requirements (historically). However, they are more flexible in terms of data sampling. This study investigates the results of software implementations of two algebraic iterative algorithms, Conjugate Gradient Least Squares (CGLS) and CGLS with Total-Variation Regularisation (TV-Reg), applied to data collected using the Nikon Xtek Custom Bay: A large 3D imaging system. Comparisons are made with the in-built FBP reconstruction and CGLS/TV-Reg reconstructions, where the latter are applied to datasets with a significantly reduced number of projections. Subsequently, data-acquisition time is reduced and increased machine functionality in the way of time-lapse imaging becomes a possibility.

Item Type: MIMS Preprint
Uncontrolled Keywords: X-ray computed tomography, algebraic reconstruction algorithms and implementation, fewer projections.
Subjects: MSC 2010, the AMS's Mathematics Subject Classification > 65 Numerical analysis
MSC 2010, the AMS's Mathematics Subject Classification > 68 Computer science
PACS 2010, the AIP's Physics and Astronomy Classification Scheme > 40 ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID MECHANICS > 41 Electromagnetism; electron and ion optics
Depositing User: Miss Sophia Bethany Coban
Date Deposited: 14 Apr 2015
Last Modified: 08 Nov 2017 18:18
URI: http://eprints.maths.manchester.ac.uk/id/eprint/2286

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