Badawi Lab - UC Davis
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Towards component-based validation of GATE: aspects of the coincidence processor.

Moraes, Eder R Poon, Jonathan K Balakrishnan, Karthikayan Wang, Wenli Badawi, Ramsey D

Published in Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)

GATE is public domain software widely used for Monte Carlo simulation in emission tomography. Validations of GATE have primarily been performed on a whole-system basis, leaving the possibility that errors in one sub-system may be offset by errors in others. We assess the accuracy of the GATE PET coincidence generation sub-system in isolation, focus...

Evaluation of penalty design in penalized maximum-likelihood image reconstruction for lesion detection.

Yang, Li Ferrero, Andrea Hagge, Rosalie J Badawi, Ramsey D Qi, Jinyi

Published in Journal of medical imaging (Bellingham, Wash.)

Detecting cancerous lesions is a major clinical application in emission tomography. Previously, we developed a method to design a shift-variant quadratic penalty function in penalized maximum-likelihood (PML) image reconstruction to improve the lesion detectability. We used a multiview channelized Hotelling observer (mvCHO) to assess the lesion det...

Performance and limitations of positron emission tomography (PET) scanners for imaging very low activity sources.

Freedenberg, Melissa I Badawi, Ramsey D Tarantal, Alice F Cherry, Simon R

Published in Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)

Emerging applications for positron emission tomography (PET) may require the ability to image very low activity source distributions in the body. The performance of clinical PET scanners in the regime where activity in the field of view is

Characterization of a high-resolution hybrid DOI detector for a dedicated breast PET/CT scanner.

Godinez, Felipe Chaudhari, Abhijit J Yang, Yongfeng Farrell, Richard Badawi, Ramsey D

Published in Physics in medicine and biology

The aim of this study is to design and test a new high-resolution hybrid depth of interaction (DOI) detector for a dedicated breast PET/CT scanner. Two detectors have been designed and built. The completed detectors are based on a 14 × 14 array of 1.5 × 1.5 × 20 mm(3) unpolished lutetium orthosilicate scintillation crystals, with each element coate...

Spontaneous Coronary Artery Dissection following Topical Hormone Replacement Therapy. PDF available through Get Fulltext Research

Pan, Alexander L Fergusson, David Hong, Robert Badawi, Ramy A

Published in Case reports in cardiology

Spontaneous coronary artery dissection is a rare condition, usually presenting as an acute coronary syndrome, and is often seen in states associated with high systemic estrogen levels such as pregnancy or oral contraceptive use. While topical hormonal replacement therapy may result in increased estrogen levels similar to those documented with oral ...

Treatment Planning and Volumetric Response Assessment for Yttrium-90 Radioembolization: Semiautomated Determination of L... PDF available through Get Fulltext Research

Monsky, Wayne L. Garza, Armando S. Kim, Isaac Loh, Shaun Lin, Tzu-Chun Li, Chin-Shang Fisher, Jerron Sandhu, Parmbir Sidhar, Vishal Chaudhari, Abhijit J. ...

Published in CardioVascular and Interventional Radiology

PurposeThe primary purpose of this study was to demonstrate intraobserver/interobserver reproducibility for novel semiautomated measurements of hepatic volume used for Yttrium-90 dose calculations as well as whole-liver and necrotic-liver (hypodense/nonenhancing) tumor volume after radioembolization. The secondary aim was to provide initial compari...

High-resolution 18F-FDG PET with MRI for monitoring response to treatment in rheumatoid arthritis PDF available through Get Fulltext Research

Chaudhari, Abhijit J. Bowen, Spencer L. Burkett, George W. Packard, Nathan J. Godinez, Felipe Joshi, Anand A. Naguwa, Stanley M. Shelton, David K. Hunter, John C. Boone, John M. ...

Published in European Journal of Nuclear Medicine and Molecular Imaging

Initial characterization of a dedicated breast PET/CT scanner during human imaging.

Sl, Bowen Y, Wu Aj, Chaudhari L, Fu Nj, Packard Gw, Burkett K, Yang Kk, Lindfors Dk, Shelton R, Hagge ...

Published in Journal of Nuclear Medicine

Excitation spectroscopy in multispectral optical fluorescence tomography: methodology, feasibility and computer simulati...

Aj, Chaudhari S, Ahn R, Levenson Rd, Badawi Sr, Cherry Rm, Leahy

Published in Physics in Medicine and Biology

Molecular probes used for in vivo optical fluorescence tomography (OFT) studies in small animals are typically chosen such that their emission spectra lie in the 680-850 nm wavelength range. This is because tissue attenuation in this spectral band is relatively low, allowing optical photons even from deep sites in tissue to reach the animal surface...

Crystal identification in positron emission tomography using nonrigid registration to a Fourier-based template.

Aj, Chaudhari Aa, Joshi Sl, Bowen Rm, Leahy Sr, Cherry Rd, Badawi

Published in Physics in Medicine and Biology

Modern positron emission tomography (PET) detectors are typically made from 2D modular arrays of scintillation crystals. Their characteristic flood field response (or flood histogram) must be segmented in order to correctly determine the crystal of annihilation photon interaction in the system. Crystal identification information thus generated is a...

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