Search Results for author: Umberto Villa

Found 10 papers, 3 papers with code

ProxNF: Neural Field Proximal Training for High-Resolution 4D Dynamic Image Reconstruction

no code implementations6 Mar 2024 Luke Lozenski, Refik Mert Cam, Mark A. Anastasio, Umberto Villa

Neural fields can address the twin challenges of data incompleteness and computational burden by exploiting underlying redundancies in these spatiotemporal objects.

Image Reconstruction

Technical Note: An Efficient Implementation of the Spherical Radon Transform with Cylindrical Apertures

no code implementations23 Feb 2024 Luke Lozenski, Refik Mert Cam, Mark A. Anastasio, Umberto Villa

The spherical Radon transform (SRT) is an integral transform that maps a function to its integrals over concentric spherical shells centered at specified sensor locations.

Image Reconstruction

Investigating the Use of Traveltime and Reflection Tomography for Deep Learning-Based Sound-Speed Estimation in Ultrasound Computed Tomography

no code implementations16 Nov 2023 Gangwon Jeong, Fu Li, Umberto Villa, Mark A. Anastasio

Deep learning-based image-to-image learned reconstruction (IILR) methods are being investigated as scalable and computationally efficient alternatives.

Spatiotemporal Image Reconstruction to Enable High-Frame Rate Dynamic Photoacoustic Tomography with Rotating-Gantry Volumetric Imagers

no code implementations1 Oct 2023 Refik M. Cam, Chao Wang, Weylan Thompson, Sergey A. Ermilov, Mark A. Anastasio, Umberto Villa

Aim: The aim of this study is to develop a spatiotemporal image reconstruction (STIR) method for dynamic PACT that can be applied to commercially available volumetric PACT imagers that employ a sequential scanning strategy.

4D reconstruction Image Reconstruction

Ideal Observer Computation by Use of Markov-Chain Monte Carlo with Generative Adversarial Networks

no code implementations2 Apr 2023 Weimin Zhou, Umberto Villa, Mark A. Anastasio

Medical imaging systems are often evaluated and optimized via objective, or task-specific, measures of image quality (IQ) that quantify the performance of an observer on a specific clinically-relevant task.

Generative Adversarial Network

Derivative-Informed Neural Operator: An Efficient Framework for High-Dimensional Parametric Derivative Learning

1 code implementation21 Jun 2022 Thomas O'Leary-Roseberry, Peng Chen, Umberto Villa, Omar Ghattas

We propose derivative-informed neural operators (DINOs), a general family of neural networks to approximate operators as infinite-dimensional mappings from input function spaces to output function spaces or quantities of interest.

Dimensionality Reduction Experimental Design

A Memory-Efficient Dynamic Image Reconstruction Method using Neural Fields

no code implementations11 May 2022 Luke Lozenski, Mark A. Anastasio, Umberto Villa

Computational and memory requirements are particularly burdensome for three-dimensional dynamic imaging applications requiring high resolution in both space and time.

Image Reconstruction Object

Mining the manifolds of deep generative models for multiple data-consistent solutions of ill-posed tomographic imaging problems

1 code implementation10 Feb 2022 Sayantan Bhadra, Umberto Villa, Mark A. Anastasio

In this work, a new empirical sampling method is proposed that computes multiple solutions of a tomographic inverse problem that are consistent with the same acquired measurement data.

Generative Adversarial Network Stochastic Optimization +2

Derivative-Informed Projected Neural Networks for High-Dimensional Parametric Maps Governed by PDEs

1 code implementation30 Nov 2020 Thomas O'Leary-Roseberry, Umberto Villa, Peng Chen, Omar Ghattas

We use the projection basis vectors in the active subspace as well as the principal output subspace to construct the weights for the first and last layers of the neural network, respectively.

Experimental Design Uncertainty Quantification

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