no code implementations • 6 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.
no code implementations • 23 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.
no code implementations • 16 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.
no code implementations • 1 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.
no code implementations • 30 Aug 2023 • Luke Lozenski, Hanchen Wang, Fu Li, Mark A. Anastasio, Brendt Wohlberg, Youzuo Lin, Umberto Villa
Once trained, the CNN can perform real-time FWI image reconstruction from USCT waveform data.
no code implementations • 2 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.
1 code implementation • 21 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.
no code implementations • 11 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.
1 code implementation • 10 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.
1 code implementation • 30 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.