High-Fidelity Modeling of Detector Lag and Gantry Motion in CT Reconstruction

no code implementations • 29 May 2018 • Steven Tilley II, Alejandro Sisniega, Jeffrey H. Siewerdsen, J. Webster Stayman

We show that modeling detector lag can reduce/remove the characteristic lag artifacts in head imaging in both a simulation study and physical experiments.

Medical Physics

Model-based Iterative Reconstruction for Flat-Panel Cone-Beam CT with Focal Spot Blur, Detector Blur, and Correlated Noise

no code implementations • 14 Jun 2017 • Steven Tilley II, Jeffrey H. Siewerdsen, J. Webster Stayman

In this work, we develop a forward model for flat-panel-based systems that includes blur and noise correlation associated with finite focal spot size and an indirect detector (e. g., scintillator).

Medical Physics

Modeling shift-variant X-ray focal spot blur for high-resolution flat-panel cone-beam CT

no code implementations • 17 Oct 2016 • Steven Tilley II, Wojciech Zbijewski, Jeffrey H. Siewerdsen, J. Webster Stayman

In both experiments image quality using the shift-variant model was significantly improved over approaches that modeled no blur or only a shift-invariant blur, suggesting a potential means to overcome traditional CBCT spatial resolution and system design limitations.

Medical Physics Optimization and Control