A5041856139- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Radiation Detection and Scintillator Technologies
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Radiation Effects and Dosimetry
- Particle Accelerators and Free-Electron Lasers
- Radiation Effects in Electronics
- Microwave and Dielectric Measurement Techniques
- Radio Frequency Integrated Circuit Design
- Radiation Shielding Materials Analysis
- Luminescence Properties of Advanced Materials
- Hydrogen embrittlement and corrosion behaviors in metals
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Wireless Power Transfer Systems
- Advances in Oncology and Radiotherapy
- Space exploration and regulation
- Space Exploration and Technology
- Fusion materials and technologies
- Particle Detector Development and Performance
- Lung Cancer Diagnosis and Treatment
- Anatomy and Medical Technology
Queensland University of Technology
2012-2023
Queensland Health
2021-2023
The University of Queensland
2021-2023
Brisbane Hand & Upper Limb Research Institute
2020-2021
Princess Alexandra Hospital
2014-2021
Royal Brisbane and Women's Hospital
2020-2021
Purpose: This work introduces the concept of very small field size. Output factor (OPF) measurements at these sizes require extremely careful experimental methodology including measurement dosimetric size same time as each OPF measurement. Two quantifiable scientific definitions threshold are presented. Methods: A practical definition was established by quantifying effect that a 1 mm error in or detector position had on OPFs and setting acceptable uncertainties 1%. Alternatively, for...
The goal of this work was to set out a methodology for measuring and reporting small field relative output assess the application published correction factors across population linear accelerators.Measurements were made at 6 MV on five Varian iX accelerators using two PTW T60017 unshielded diodes. Relative readings profile measurements nominal square sizes side 0.5 1.0 cm. actual in-plane (A) cross-plane (B) widths taken be FWHM 50% isodose level. An effective size, defined as √FS eff=A · B,...
Due to their small collecting volume, diodes are commonly used in field dosimetry. However, the relative sensitivity of a diode increases with decreasing size. Conversely, air gaps have been shown cause significant decrease detector as size is decreased. Therefore, this study uses Monte Carlo simulations look at introducing upstream such that they measure constant across all sizes Varying thicknesses were introduced onto end two commercial (PTW 60016 photon and PTW 60017 electron diode),...
The purpose of this study was to investigate the effect very small air gaps (less than 1 mm) on dosimetry photon fields used for stereotactic treatments. Measurements were performed with optically stimulated luminescent dosimeters (OSLDs) 6 MV photons a Varian 21iX linear accelerator Brainlab µMLC attachment square field sizes down mm × mm. Monte Carlo simulations using EGSnrc C++ user code cavity. It found that model in accurately simulated OSLD measurements accelerator. For size, 0.5 gap...
A technique is described for investigation of the ultrasonic attenuation coefficient evaluation absorbed dose in polymer gel dosimeters. Using this as a function PAG and MAGIC dosimeters was measured. The sensitivity found to be 2.9 ± 0.3 dB m−1 Gy−1 4.2 Gy−1. Unlike previous studies enables direct measure coefficient.
Two diodes which do not require correction factors for small field relative output measurements are designed and validated using experimental methodology. This was achieved by adding an air layer above the active volume of diode detectors, canceled out increase in response fields to standard sizes.Due increased density silicon other components within a diode, additional electrons created. In very fields, gap acts as effective filter with high angle incidence. The aim design that balanced...
Purpose Radiochromic film has been established as a detector that can be used without the need for perturbation correction factors small field dosimetry in water. However, low density media such lung have yet to published. This study calculated required account of radiochromic when equivalent material. Method Monte Carlo simulations were calculate dose Gafchromic EBT3 placed inside phantom. The beam simulated had nominal energy 6 MV and sizes ranged from 10 × mm 2 30 . was varied between 0.2...
To obtain accurate Monte Carlo simulations of small radiation fields, it is important model the initial source parameters (electron energy and spot size) accurately. However recent studies have shown that field dosimetry correction factors are insensitive to these parameters. The aim this work extend concept test if affect dose perturbations in general, which for detector design calculating perturbation factors.
This study extends the ‘zero scan’ method for CT imaging of polymer gel dosimeters to include multislice acquisitions. Multislice images consisting 24 slices 1.2 mm thickness were acquired an irradiated dosimeter and processed with zero scan technique. The results demonstrate that scan‐based readout can be successfully applied generate a three‐dimensional image field. Compared raw images, figures cross‐gel profiles demonstrated reduced noise clear visibility penumbral region. Moreover, these...