Masters Degrees (Medical Physics)
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Quantification accuracy for I-123 SPECT/CT studies using LEHR and me collimators: a Monte Carlo study
(University of the Free State, 2021-12)The accurate quantification of Nuclear Medicine single photon emission tomography (SPECT) plays an important part in radiopharmaceutical therapy. Accurately quantifying SPECT images of a diagnostic radionuclide such as ... -
Computed tomography radiomic texture features dependence upon imaging parameters
(University of the Free State, 2019-11)Introduction and Aim: Few studies have been carried out to determine the influence of Computed Tomography (CT) acquisition parameters (slice thickness, tube potential difference (kVp), and tube current time product (mAs)) ... -
Development of a brachytherapy treatment planning module for cervix cancer utilising biological dose metrics
(University of the Free State, 2020-12)The contouring uncertainties associated with the use of computed tomography imaging for brachytherapy planning creates the need to investigate an alternative planning method for Image-Guided Adaptative Brachytherapy. This ... -
Comparison between measured and simulated activity using Gafchromic™ film with radionuclides
(University of the Free State, 2020-08)In this study, Gafchromic™ film XR-QA2 and RT-QA2 were used to characterise the film energy response against various radionuclides. The film response was investigated with respect to different backscatter materials. The ... -
Estimation of the eye lens doses in a catheterization laboratory from available image parameters
(University of the Free State, 2020-07)Background and objective: New data on eye lens dosimetry supports the theory that the threshold of radiation-induced cataracts could be substantially lower than previously believed with some investigators arguing that ... -
Characterization of small megavoltage photon beams for radiography
(University of the Free State, 2017-07)English: Introduction The landscape of radiation treatment techniques is ever evolving in pursuit of improved target coverage. The latest techniques such as IMRT, SBRT, SRS and VMAT, provide improved target coverage by ... -
Commissioning and optimization of a total skin electron therapy technique using a high rate electron facility
(University of the Free State, 2007-06)English: Total skin electron therapy (TSET) is the treatment of choice for several malignant diseases of the skin (Kaposi sarcoma, mycosis fungoides). Several different techniques have been developed in various centers, ... -
Kwantifisering van radionukliedverspreiding deur planare beelding met 'n sintillasiekamera
(University of the Free State, 2000-06)English: In this study attenuation and scatter correction techniques in planar imaging were investigated as well as the practical implementation of these techniques in clinical studies. The attenuation correction technique ... -
An evaluation of the effect of scatter and attenuation correction of gamma photons on the reconstructed radionuclide distribution in the myocardial wall during spect imaging
(University of the Free State, 2000-11)The purpose of this study was firstly to evaluate the selection of reconstruction parameters (i.e. the number of subsets and the number of iterations) based on phantom studies. The second aim was to evaluate the effect ... -
Development of a Monte Carlo simulation method for the evaluation of dose distribution calculations of radiotherapy treatment planning systems
(University of the Free State, 1999-11)In this study a method is described whereby the dose distributions calculated by any treatment planning system (TPS) could be evaluated using dose distributions calculated with Monte Carlo simulations. The Monte Carlo ... -
The assessment of potential radiation hazards from gold mines in the Free State Goldfields to members of the public
(University of the Free State, 1998-11)The gold mines In the Free State Goldfields extract and process ore from underground, which contains naturally radioactive uranium and its associated decay products. This assessment aimed to cost effectively determine the ... -
Using Monte Carlo techniques to evaluate the dose distributions from a radiotherapy treatment planning system
(University of the Free State, 2000-06)English: In this study we used Monte Carlo techniques to simulate the SL25 linear accelerator treatment head using the BEAM Code. The main purpose of study was to evaluate the dose distributions obtained by the CADPLAN ... -
Development and validation of a molecular assay and evaluation of the GeneXpert® MTB/RIF assay for the rapid detection of genital tuberculosis
(University of the Free State, 2016-02)English: Tuberculosis (TB) is a communicable disease which is caused by the bacterium Mycobacterium tuberculosis (MTB). According to the World Health Organization, globally in 2015 there were 10.4 million new cases and 1.4 ... -
Monte Carlo study on megavolt x-ray therapy for development of suitable targets for the evaluation of nano particle dose enhancement
(University of the Free State, 2016-09)English: INTRODUCTION: Radiation dose enhancement with nanoparticles is a treatment technique involving the irradiation of tumour seeded with high atomic number (high Z) material. This work describes the generation of ... -
Monte Carlo evaluation of the dose perturbation effect of various hip prostheses during pelvic megavoltage photon radiotherapy
(University of the Free State, 2016-11)English: Introduction: Hip prostheses (HPs) are routinely used in hip augmentation surgery to replace painful or dysfunctional hip joints, especially in the elderly population. A number of patients with HPs are undergoing ... -
Evaluation 99mTc and 123I quantification using SPECT/CT
(University of the Free State, 2015-02)English: A review of Single Photon Emission Tomography (SPECT) quantification shows that different protocols and phantoms are available to evaluate SPECT quantification accuracy. This study was necessitated by the lack ... -
Optimisation of delivery efficiency in prostate intensity modulated radiotherapy planning
(University of the Free State, 2016-02)English: Evidence that supports dose escalation for prostate cancer is growing and with Intensity Modulated Radiation Therapy (IMRT) higher conformal target doses can be delivered. With more segments and higher monitor ... -
Manual quantification for right and left ventricular function using cardiac magnetic resonance imaging
(University of the Free State, 2012-07)Abstract not available -
Development of a particle source model for a synergy linear accelerator to be used in Monte Carlo radiation dose calculations for cancer therapy
(University of the Free State, 2014-05)English: In oncology patients are treated for cancer with various methods such as surgery, chemo therapy and radiation therapy. Accurate radiation treatment planning and dose delivery to the tumour is necessary for the ... -
A rabbit phantom study to reduce neonatal radiation dose without compromising image quality.
(University of the Free State, 2015-02)English: Neonates who are ill at birth often require a large number of radiographs during the period of hospitalization. Radiography refers to the imaging of body parts using x-rays and plays an important role in the ...
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