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Proceedings Paper

Improving spatial-resolution in high cone-angle micro-CT by source deblurring
Author(s): Heyang Li; Andrew Kingston; Glenn Myers; Benoit Recur; Michael Turner; Andrian Sheppard
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Paper Abstract

Micro scale computed tomography (CT) can resolve many features in cellular structures, bone formations, minerals properties and composite materials not seen at lower spatial-resolution. Those features enable us to build a more comprehensive model for the object of interest. CT resolution is limited by a fundamental trade off between source size and signal-to-noise ratio (SNR) for a given acquisition time. There is a limit on the X-ray flux that can be emitted from a certain source size, and fewer photons cause a lower SNR. A large source size creates penumbral blurring in the radiograph, limiting the effective spatial-resolution in the reconstruction. High cone-angle CT improves SNR by increasing the X-ray solid angle that passes through the sample. In the high cone-angle regime current source deblurring methods break down due to incomplete modelling of the physical process. This paper presents high cone-angle source de-blurring models. We implement these models using a novel multi-slice Richardson-Lucy (M-RL) and 3D Conjugate Gradient deconvolution on experimental high cone-angle data to improve the spatial-resolution of the reconstructed volume. In M-RL, we slice the back projection volume into subsets which can be considered to have a relative uniform convolution kernel. We compare these results to those obtained from standard reconstruction techniques and current source deblurring methods (i.e. 2D Richardson-Lucy in the radiograph and the volume respectively).

Paper Details

Date Published: 11 September 2014
PDF: 11 pages
Proc. SPIE 9212, Developments in X-Ray Tomography IX, 92120B (11 September 2014); doi: 10.1117/12.2062415
Show Author Affiliations
Heyang Li, The Australian National Univ. (Australia)
Andrew Kingston, The Australian National Univ. (Australia)
Glenn Myers, The Australian National Univ. (Australia)
Benoit Recur, The Australian National Univ. (Australia)
Michael Turner, The Australian National Univ. (Australia)
Andrian Sheppard, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 9212:
Developments in X-Ray Tomography IX
Stuart R. Stock, Editor(s)

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