A spectral calibration technique for x-ray CT

Samuel M. Johnston; Cristian T. Badea

doi:10.1117/12.911532

3 March 2012 A spectral calibration technique for x-ray CT

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 831333 (2012) https://doi.org/10.1117/12.911532
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

Spectral reconstruction algorithms for x-ray CT require an accurate spectral model of the system, including the spectrum of the photons emitted by the source and the spectral sensitivity of the detector. Although these components of the spectral model have been characterized in previous studies, there might be additional components that are unaccounted for, such as the inherent filtration of the x-ray source and the detector. In this study, we present a technique for measuring the inaccuracies in the spectral model and accounting for them. This technique entails the acquisition of photon measurements with several materials placed between the source and the detector, and the solution of a linear system of equations. We test the accuracy of this technique in simulations, and demonstrate its potential to improve the results of spectral reconstruction.

Citation Download Citation

Samuel M. Johnston and Cristian T. Badea "A spectral calibration technique for x-ray CT", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831333 (3 March 2012); https://doi.org/10.1117/12.911532

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