Search Results for author: Joseph A. O'Sullivan

Found 9 papers, 1 papers with code

MB-DECTNet: A Model-Based Unrolled Network for Accurate 3D DECT Reconstruction

no code implementations1 Feb 2023 Tao Ge, Maria Medrano, Rui Liao, David G. Politte, Jeffrey F. Williamson, Bruce R. Whiting, Joseph A. O'Sullivan

Therefore, to improve its convergence, we have embedded DECT SIR into a deep learning model-based unrolled network for 3D DECT reconstruction (MB-DECTNet) that can be trained in an end-to-end fashion.

A Metal Artifact Reduction Scheme For Accurate Iterative Dual-Energy CT Algorithms

no code implementations31 Jan 2022 Tao Ge, Maria Medrano, Rui Liao, Jeffrey F. Williamson, David G. Politte, Bruce R. Whiting, Joseph A. O'Sullivan

We compared DEAM with the proposed method to the original DEAM and vendor reconstructions with and without metal-artifact reduction for orthopedic implants (O-MAR).

Metal Artifact Reduction

Iterative Algorithms for Joint Scatter and Attenuation Estimation From Broken Ray Transform Data

no code implementations25 Jun 2020 Michael R. Walker II, Joseph A. O'Sullivan

Transmission measurements resolve low-frequency ambiguity in the joint image estimation problem, while multiple scatter measurements resolve the attenuation image.

Laplacian Prior Variational Automatic Relevance Determination for Transmission Tomography

no code implementations26 Oct 2017 Jingwei Lu, David G. Politte, Joseph A. O'Sullivan

In the classic sparsity-driven problems, the fundamental L-1 penalty method has been shown to have good performance in reconstructing signals for a wide range of problems.

Spectrally Grouped Total Variation Reconstruction for Scatter Imaging Using ADMM

no code implementations29 Jan 2016 Ikenna Odinaka, Yan Kaganovsky, Joel A. Greenberg, Mehadi Hassan, David G. Politte, Joseph A. O'Sullivan, Lawrence Carin, David J. Brady

We pursue an optimization transfer approach where convex decompositions are used to lift the problem such that all hyper-voxels can be updated in parallel and in closed-form.

Image Reconstruction

Multiresolution Approach to Acceleration of Iterative Image Reconstruction for X-Ray Imaging for Security Applications

no code implementations24 Jun 2015 S. Degirmenci, Joseph A. O'Sullivan, David G. Politte

As the iterations proceed, the wavelet tree on which the updates are made is expanded based on a criterion and detail coefficients at each level are updated and the tree is expanded this way.

Image Reconstruction

Alternating Minimization Algorithm with Automatic Relevance Determination for Transmission Tomography under Poisson Noise

1 code implementation29 Dec 2014 Yan Kaganovsky, Shaobo Han, Soysal Degirmenci, David G. Politte, David J. Brady, Joseph A. O'Sullivan, Lawrence Carin

We propose a globally convergent alternating minimization (AM) algorithm for image reconstruction in transmission tomography, which extends automatic relevance determination (ARD) to Poisson noise models with Beer's law.

Image Reconstruction

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