A5066602793- Ultrasound Imaging and Elastography
- Ultrasound and Hyperthermia Applications
- Photoacoustic and Ultrasonic Imaging
- Anesthesia and Neurotoxicity Research
- Intensive Care Unit Cognitive Disorders
- Anesthesia and Sedative Agents
- Microwave Imaging and Scattering Analysis
- Advanced MRI Techniques and Applications
- Particle Detector Development and Performance
- Optical Imaging and Spectroscopy Techniques
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Gamma-ray bursts and supernovae
- Elasticity and Material Modeling
- AI in cancer detection
- Ultrasonics and Acoustic Wave Propagation
University of Wisconsin–Madison
2022-2023
Universidad Nacional Autónoma de México
2014-2021
Concordia University
2021
Pulse-echo quantitative ultrasound (PEQUS), which estimates the properties of tissue microstructure, entails estimating average attenuation and backscatter coefficient (BSC). Growing recent research has focused on regularized estimation these parameters. Herein, we make two contributions to this field: first, consider physics backscattering devise regularization terms accordingly. More specifically, since gradually alters in different parts tissue, while BSC can vary markedly from apply L2...
This study applied three methods to compensate for intervening tissue attenuation in the estimation of backscatter coefficient a tissue-mimicking phantom with spatial variations attenuation. The first method, considered as gold standard, made use estimates measured using an independent substitution technique. second method estimated local Constrained-Spectral Log Difference (CLD) technique, and then used these values quantify total third consisted on regularized, dynamic programming...
We report the characterization of thalamus fourteen newborn Rhesus macaques using incoherent and coherent ultrasound scattering. Particularly, we study whether sources scattering could contribute to variability estimates effective scatterer size, ESS, used detect neurotoxic effects anesthesia. This is performed by computing generalized spectrum, echo-amplitude signal-to-noise ratio, echo phase histogram nonuniformity, comparing their values those obtained from a reference material with...
In this study we present a preliminary evaluation of the inter-operator (InterOp) and intra-operator (IntraOp) variability Quantitative Ultrasound features based on first-order speckle statistics used in breast cancer characterization. echo signals from ten patients with biopsy-confirmed invasive ductal carcinomas were acquired vivo radial antiradial planes commercial ultrasound system using linear array transducer. Each patient was scanned by three radiologists, each which performed...
Goal: This study compares two strategies to compensate for attenuation in the estimation of backscatter coefficient σ breast cancer Methods: Attenuation compensation was performed using local estimates from a constrained Spectral-Log-Difference (CSLD) method, and average dynamic programming (DP)-based regularized method. First, bias linearity both were evaluated Gammex 410SCG phantom with inclusions known imaged at 8 MHz on Verasonics Vantage 128 scanner. Then, compared terms...
Here we report on the intra- and inter-operator variability of backscatter coefficient (BSC) estimated with a new low-variance quantitative ultrasound (QUS) approach applied to breast lesions in vivo.Radiofrequency (RF) echo signals were acquired from 29 BIRADS 4 5 2 sequential cohorts following imaging protocols: cohort 1) radial antiradial views, 2) short- long-axis views. Protocol was implemented after retraining discussion how improve reproducibility. Each patient scanned by at least 3...
This talk will present recent results from our multi-institutional effort to advance the application of Quantitative Ultrasound in obstetrics and perinatal care. In field obstetrics, we are investigating use shear wave elasticity imaging (SWEI) predict risk preterm birth based on assessing viscoelastic properties uterine cervix. Longitudinal studies non-human primates (NHP) humans showed a similar rate decrease speed, SWS (1.6% 1.5%/% gestational age, respectively), validating animal model...
Quantitative ultrasound (QUS) aims to extract quantitative properties of the tissue, and as such, can be used in both diagnostic interventional imaging. Using pulse echo QUS techniques attenuation backscatter coefficients (BSC) estimated. Our group recently introduced a strategy named AnaLytical Globally rEgularized BacksccatteR quAntitative ultrasound, or ALGEBRA estimate BSC average by optimizing regularized cost function. considers equal contributions for different frequencies across...