Search Results for author: Nicholas Dwork

Found 9 papers, 1 papers with code

Accelerated Parallel Magnetic Resonance Imaging with Compressed Sensing using Structured Sparsity

1 code implementation4 Dec 2023 Nicholas Dwork, Erin K. Englund

Compressed sensing allows one to reconstruct a high-quality image with fewer samples which can be collected with a faster scan.

The Dependence of Parallel Imaging with Linear Predictability on the Undersampling Direction

no code implementations18 Jan 2023 Alex McManus, Stephen Becker, Nicholas Dwork

Parallel imaging with linear predictability takes advantage of information present in multiple receive coils to accurately reconstruct the image with fewer samples.

Image Reconstruction

Physics-driven Deep Learning for PET/MRI

no code implementations11 Jun 2022 Abhejit Rajagopal, Andrew P. Leynes, Nicholas Dwork, Jessica E. Scholey, Thomas A. Hope, Peder E. Z. Larson

In this paper, we review physics- and data-driven reconstruction techniques for simultaneous positron emission tomography (PET) / magnetic resonance imaging (MRI) systems, which have significant advantages for clinical imaging of cancer, neurological disorders, and heart disease.

MRI Reconstruction

Utilizing the Structure of the Curvelet Transform with Compressed Sensing

no code implementations24 Jul 2021 Nicholas Dwork, Peder E. Z. Larson

The curvelet representation is approximately sparse; thus, it is a useful sparsifying transformation to be used with compressed sensing.

Denoising Image Reconstruction

Least Squares Optimal Density Compensation for the Gridding Non-uniform Discrete Fourier Transform

no code implementations12 Jun 2021 Nicholas Dwork, Daniel O'Connor, Ethan M. I. Johnson, Corey A. Baron, Jeremy W. Gordon, John M. Pauly, Peder E. Z. Larson

The Gridding algorithm has shown great utility for reconstructing images from non-uniformly spaced samples in the Fourier domain in several imaging modalities.

Fast Variable Density Poisson-Disc Sample Generation with Directional Variation

no code implementations14 Apr 2020 Nicholas Dwork, Corey A. Baron, Ethan M. I. Johnson, Daniel O'Connor, John M. Pauly, Peder E. Z. Larson

We present a fast method for generating random samples according to a variable density Poisson-disc distribution.

Di-chromatic Interpolation of Magnetic Resonance Metabolic Imagery

no code implementations11 Mar 2020 Nicholas Dwork, Jeremy W. Gordon, Shuyu Tang, Daniel O'Connor, Esben Sovso Szocska Hansen, Christoffer Laustsen, Peder E. Z. Larson

Magnetic resonance imaging with hyperpolarized contrast agents can provide unprecedented \textit{in-vivo} measurements of metabolism, but yields images that are lower resolution than that achieved with proton anatomical imaging.

Utilizing the Wavelet Transform's Structure in Compressed Sensing

no code implementations11 Feb 2020 Nicholas Dwork, Daniel O'Connor, Corey A. Baron, Ethan M. I. Johnson, Adam B. Kerr, John M. Pauly, Peder E. Z. Larson

In this work, we take advantage of the structure of this wavelet transform and identify an affine transformation that increases the sparsity of the result.

Denoising Image Reconstruction

Cannot find the paper you are looking for? You can Submit a new open access paper.