Affiliations: Department of Physics and Astronomy, University of
Manitoba, Winnipeg, MB, Canada | CancerCare Manitoba, Winnipeg, MB, Canada | Department of Radiology, University of Manitoba,
Winnipeg, MB, Canada
Abstract: The reconstructed electron density image quality is sensitive to the
detector size and energy resolution, which contribute to the blurring and noise
in the image. This work evaluates optimal values of the detector parameters for
a realistic system through analytical simulations of the transverse slice of
the dedicated breast CT system geometry. This study introduces a spectroscopic
x-ray tomography technique which uses multiple projections to reconstruct
electron density images by backprojecting scattered photons over isogonic
curves. The reconstruction can be obtained using a single projection yet its
quality degrades as the acquisition conditions i.e. detector size and energy
resolution deviate from the ideal. The reconstruction quality becomes
inconsistent throughout the image due to the data under sampling caused by the
finite resolution of the detector. The extension to the multi-projection mode
effectively fills-in the missing data space and improves the ability to
reconstruct an object. This work demonstrates the possibility to obtain images
in the presence of noise.
Keywords: Compton scatter tomography, detector size, detector energy resolution
