A Spectral CT Method to Directly Estimate Basis Material Maps From Experimental Photon-Counting Data
Document Type
Article
Language
Eng
Publication Date
9-2017
Publisher
Institute of Electrical and Electronic Engineers (IEEE)
Source Publication
IEEE Transactions on Medical Imaging
Source ISSN
0278-0062
Abstract
The proposed spectral CT method solves the constrained one-step spectral CT reconstruction (cOSSCIR) optimization problem to estimate basis material maps while modeling the nonlinear X-ray detection process and enforcing convex constraints on the basis map images. In order to apply the optimization-based reconstruction approach to experimental data, the presented method empirically estimates the effective energy-window spectra using a calibration procedure. The amplitudes of the estimated spectra were further optimized as part of the reconstruction process to reduce ring artifacts. A validation approach was developed to select constraint parameters. The proposed spectral CT method was evaluated through simulations and experiments with a photon-counting detector. Basis material map images were successfully reconstructed using the presented empirical spectral modeling and cOSSCIR optimization approach. In simulations, the cOSSCIR approach accurately reconstructed the basis map images (
Recommended Citation
Schmidt, Tal Gilat; Barber, Rina Foygel; and Sidky, Emil Y., "A Spectral CT Method to Directly Estimate Basis Material Maps From Experimental Photon-Counting Data" (2017). Biomedical Engineering Faculty Research and Publications. 517.
https://epublications.marquette.edu/bioengin_fac/517
ADA Accessible Version
Comments
Accepted version. IEEE Transactions on Medical Imaging. Vol. 36, No. 9 (September 2017): 1808-1819. DOI. © 2017 Institute of Electrical and Electronic Engineers (IEEE). Used with permission.