A5015728639- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Digital Radiography and Breast Imaging
- Medical Imaging Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Advances in Oncology and Radiotherapy
- Radiology practices and education
- Advanced Radiotherapy Techniques
- Calibration and Measurement Techniques
- Radiomics and Machine Learning in Medical Imaging
- Radiation Detection and Scintillator Technologies
- AI in cancer detection
- Biomedical and Engineering Education
- Abdominal Trauma and Injuries
- Pelvic and Acetabular Injuries
- Advanced MRI Techniques and Applications
- Cerebrovascular and Carotid Artery Diseases
- Infrared Target Detection Methodologies
- Clinical Laboratory Practices and Quality Control
- Liver Disease and Transplantation
- X-ray Spectroscopy and Fluorescence Analysis
- Acute Ischemic Stroke Management
- Breast Cancer Treatment Studies
University of California, Davis
2009-2024
University of California Davis Medical Center
2009-2023
UC Davis Health System
2004-2022
Regis University
2020
UC Davis Children's Hospital
2014
Duke University
2014
American Association of Physicists in Medicine
2011
Carleton College
2011
Alliance for Clinical Trials in Oncology
2011
The University of Texas MD Anderson Cancer Center
2011
A tungsten anode spectral model using interpolating polynomials (TASMIP) was used to compute x‐ray spectra at 1 keV intervals over the range from 30 kV 140 kV. The TASMIP is not semi‐empirical and uses no physical assumptions regarding production, but rather interpolates measured constant potential published by Fewell et al. [ Handbook of Computed Tomography X‐ray Spectra (U.S. Government Printing Office, Washington, D.C., 1981)]. output measurements (mR/mAs m) were made on a calibrated...
The distribution of scattered x rays detected in a two‐dimensional projection radiograph at diagnostic x‐ray energies is measured as function field size and object thickness fixed potential air gap. An image intensifier–TV based imaging system used for acquisition, manipulation, analysis. A scatter point spread (PSF) with an assumed linear, spatially invariant response modeled modified Gaussian distribution, characterized by two parameters describing the width fraction events detected. PSF...
The effects of the stationary noise patterns and variable pixel responses that commonly occur with uniform exposure digital detectors can be effectively reduced by simple 'flat- field' image processing methods. These methods are based upon a linear system response acquisition an (or images) acquired at high to create inverse matrix values when applied uncorrected image, remove components. System performance is optimized correction totally free statistical variations. However, will not...
The purpose of this work was to develop and make available x-ray spectra for some the most widely used digital mammography (DM), breast tomosynthesis (BT), CT (bCT) systems in North America.The Monte Carlo code MCNP6 simulate minimally filtered (only beryllium) at 8 tube potentials from 20 49 kV DM/BT, 9 35 70 bCT. Vendor-specific anode compositions, effective angles, focal spot sizes, source-to-detector distances, beryllium filtration were simulated. For each 0.5 keV energy bin all...
The previous work of Yin, Giger, and Doi [Med. Phys. 17 , 962–966 (1990)] demonstrated that using a computerized fit an analytic line spread function to experimentally measured data is very useful for determining the presampling modulation transfer imaging system. In this report, Yin et al . extended include expression edge (ESF). By fitting determined analytical expression, normalized (LSF) (MTF) can be easily calculated from four ESF coefficients. extension should valuable in cases where...
Purpose: Dedicated breast computed tomography (bCT) technology for the purpose of cancer screening has been a focus research at UC Davis since late 1990s. Previous studies have shown that improvement in spatial resolution characteristics this modality correlates with greater microcalcification detection, factor considered potential limitation bCT. The aim study is to improve as characterized by modulation transfer function (MTF) via changes scanner hardware components and operational schema....
The European Society of Radiology identified 10 common indications for computed tomography (CT) as part the Study on Clinical Diagnostic Reference Levels (DRLs, EUCLID), to help standardize radiation doses. objective this study is generate DRLs and median doses these using data from UCSF CT International Dose Registry.
Recommended methods to test the performance of computed radiography (CR) digital radiographic systems have been recently developed by AAPM Task Group No. 10. Included are tests for dark noise, uniformity, exposure response, laser beam function, spatial resolution, low-contrast accuracy, erasure thoroughness, and throughput. The recommendations may be used acceptance testing new CR devices as well routine evaluation checks in clinical use. purpose this short communication is provide a tabular...
To develop tables of normalized glandular dose coefficients D(g)N for a range anode-filter combinations and tube voltages used in contemporary breast imaging systems. Previously published mono-energetic values were with various spectra to mathematically compute coefficients. The tungsten anode from TASMICS used; molybdenum rhodium anode-spectra generated using MCNPX Monte Carlo code. filtered thicknesses Al, Rh, Mo or Cu. An initial half value layer (HVL) calculation was made the filter...
Computer analysis of digital subtraction angiography (DSA) was utilized to quantify the effectiveness tissue-type plasminogen activator (TPA) in a rabbit cerebroembolic stroke model. Fourteen animals underwent cannulation facial artery and preembolus angiogram. Autologous blood clots were then injected, occlusion internal carotid at circle Willis documented with repeat The experimental group received 1-mg/kg intravenous infusion TPA via femoral catheter for 90 minutes. A control an...
The American Association of Physicists in Medicine (AAPM) is a nonprofit professional society whose primary purposes are to advance the science, education, and practice medical physics. AAPM has more than 8000 members principal organization physicists United States. will periodically define new guidelines for physics help science improve quality service patients throughout Existing be reviewed purpose revision or renewal, as appropriate, on their fifth anniversary sooner. Each guideline...
CT Phantom Evaluation of 67,392 American College Radiology Accreditation Examinations: Implications for Opportunistic Screening Osteoporosis Using CTRobert D. Boutin, MD1, Andrew M. Hernandez, PhD2, Leon Lenchik, MD3, J. Anthony Seibert, Dustin A. Gress, MS4 and John Boone, PhD2Audio Available | Share
Advances in digital x‐ray detector systems have led to a renewed interest the performance of phosphors and other materials. Indirect flat panel charged coupled device (CCD) require more technologically challenging geometry, whereby beam is incident on front side scintillator, light produced must diffuse back surface screen reach photoreceptor. Direct based selenium also enjoyed growing interest, both commercially academically. Monte Carlo simulation techniques were used study scattering...
The purpose of this investigation was to evaluate the potential monoenergetic x-ray sources improve image quality and reduce patient dose compared conventional tungsten anode spectra. This purely a computer simulation study. X-ray spectra were generated using Birch Marshal spectral model, transmission calculated Monte Carlo techniques, numerical method developed for determining antiscatter grid performance. A 120 mg/cm2 Gd2O2S intensifying screen simulated radiography 144 CsI intensifier...