A Novel Low-Dose Dual-Energy Imaging Method for a Fast-Rotating Gantry-Type CT Scanner

CT scan by use of a beam-filter placed between the x-ray source and patient allows single-scan low-dose dual-energy imaging with minimal hardware modification to existing systems. We have earlier demonstrated feasibility such method multi-slit reciprocating along direction perpendicular rotation axis in cone-beam system. However, would face mechanical challenges when is supposed cooperate fast-rotating gantry diagnostic In this work, we propose new scanning associated image reconstruction algorithm that can overcome these challenges. slide has structure its slits being at slanted angle during scan. A streaky pattern show up sinogram domain as result. Using notch filter Fourier sinogram, removed streaks reconstructed an filtered-backprojection algorithm. The remaining artifacts were suppressed applying l 0 norm based smoothing. prior, low- high-energy images iterative framework. An image-based material decomposition then followed. conducted simulation study test using XCAT phantom also experimental Catphan phantom, head iodine-solution monkey anesthesia, showed successful performance decomposition.