A5072562887- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Advanced Radiotherapy Techniques
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Radiation Effects and Dosimetry
- Pulsed Power Technology Applications
- Graphite, nuclear technology, radiation studies
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
- Crystallography and Radiation Phenomena
- Brain Metastases and Treatment
- Advanced X-ray and CT Imaging
The University of Texas MD Anderson Cancer Center
2017-2023
Radiation Oncology Associates
2005-2014
Abstract X‐ray diffraction from a solid crystal shows the wave nature of photons. It is an important electromagnetic (EM) physics process when photons interact with crystal. Bragg diffraction, often called reflection, special case general form known as Laue diffraction. When Bragg's law met, incident photon beam reflected plane behaving specular reflection at angle. However, physical has not been integrated into general‐purpose Monte Carlo simulation toolkit Geant4 for particle physics. In...
Abstract We describe the development and analysis of a new teletherapy modality that, through novel approach to targeted radiation delivery, has potential provide greater conformality than conventional photon-based treatments. The proposed system uses an X-ray lens reflect photons from tube toward focal spot. resulting dose distributions have highly localized peak dose, with lower doses in converging cone. Physical principles governing design this are presented, along series measurements...
Objective. A novel treatment modality is currently being developed that produces converging monoenergetic x-rays. Conventional application of dosimetric calibration as presented in protocol TG61 not applicable. Furthermore, the dosimetry focal point beam on order a few millimeters, requiring high-resolution dosimeter. Here we present procedure to calibrate radiochromic film for narrow-beam 60 keV photons well absolute focused study spot dose rate after passing through bone-equivalent...
. A novel x-ray field produced by an ultrathin conical target is described in the literature. However, optimal design for associated collimator remains ambiguous. Current optimization methods using Monte Carlo calculations restrict efficiency and robustness of process. more generic method that reduces parameter constraints while minimizing computational load necessary. numerical optimizing longitudinal hole geometry a cylindrically-symmetrical tube demonstrated compared to calculations.
Monte Carlo particle simulation has become the primary tool for designing low-energy miniature x-ray tubes due to difficulties of physically prototyping these devices and characterizing their radiation fields. Accurate electronic interactions within targets is necessary modeling both photon production heat transfer. Voxel-averaging can conceal hot spots in target deposition profile that threaten integrity tube.This research seeks a computationally-efficient method estimating voxel-averaging...
Abstract Background Carbon nanotube‐based cold cathode technology has revolutionized the miniaturization of X‐ray tubes. However, current applications these devices required optimization for large, uniform fields with low intensity. Purpose This work investigated feasibility and radiological characteristics a novel conical target optimized high intensity directionality to be used in compact tube. Methods The proposed device uses an ultrathin, tungsten‐diamond that exhibits significant heat...
The Spallation Neutron Source accelerator systems will provide a 1 GeV, 1.44 MW proton beam to liquid mercury target for neutron production. complex consists of an H-injector capable producing 38 mA peak current, GeV linear accelerator, accumulator ring and associated transport lines. Drift Tube Linac, Coupled-Cavity Linac Superconducting which 1.5 average current the ring. staged commissioning is proceeding as component installation progresses. Recently, normal-conducting was commissioned....