Image Processing

Penalized-likelihood image reconstruction for x-ray fluorescence computed tomography

[+] Author Affiliations
Patrick J. La Rivière, David Billmire, Phillip Vargas

The University of Chicago, Department of Radiology, 5841 S. Maryland Avenue, MC-2026, Chicago, Illinois 60615

Mark Rivers, Stephen R. Sutton

GSECARS, Consortium of Advanced Radiation Sources, Advanced Photon Source, Argonne, Illinois 60439 and The University of Chicago, Department of Geophysical Sciences, Chicago, Illinois 60615

Opt. Eng. 45(7), 077005 (July 20, 2006). doi:10.1117/1.2227273
History: Received September 13, 2005; Revised November 22, 2005; Accepted December 13, 2005; Published July 20, 2006
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X-ray fluorescence computed tomography (XFCT) allows for the reconstruction of the distribution of elements within a sample from measurements of fluorescence x rays produced by irradiation of the sample with monochromatic synchrotron radiation. XFCT is not a transmission tomography modality, but rather a stimulated emission tomography modality; thus correction for attenuation of the incident and fluorescence photons is essential if accurate images are to be obtained. This is challenging because the attenuation map is, in general, known only at the stimulating beam energy and not at the various fluorescence energies of interest. We make use of empirically fitted analytic expressions for x-ray attenuation coefficients to express the unknown attenuation maps as linear combinations of known quantities and the unknown elemental concentrations of interest. We then develop an iterative image reconstruction algorithm based on penalized-likelihood methods that have been developed for medical emission tomography. Studies with numerical phantoms indicate that the approach is able to produce qualitatively and quantitatively accurate reconstructed images even in the face of severe attenuation. We also apply the method to real synchrotron-acquired data and demonstrate a marked improvement in image quality relative to filtered backprojection reconstruction.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Patrick J. La Rivière ; David Billmire ; Phillip Vargas ; Mark Rivers and Stephen R. Sutton
"Penalized-likelihood image reconstruction for x-ray fluorescence computed tomography", Opt. Eng. 45(7), 077005 (July 20, 2006). ; http://dx.doi.org/10.1117/1.2227273


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