Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Diagnostic Radiology"”.
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Shades of Grey: An Exploration of the Student Learning Experience in Diagnostic Radiology Education
<p>Diagnostic radiology education is a specialty within healthcare education and encompasses education at both the undergraduate and resident level. There is little research regarding what constitutes effective radiology education. The broad purpose of this study was to investigate through the …
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Determination of the genetically-significant dose from diagnostic radiology for the South African population, 1990-1991
The International Commission on Radiological Protection (ICRP) determines the policy regarding radiation safety internationally. To the ICRP, hereditary changes as a result of either high or low doses, are of a major concern. The SA Forum for Radiation Protection recommended that a research project …
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Investigation of the barium enema x-ray examination as a significant contributor to the genetically-significant dose from diagnostic radiology
The results of a study conducted by Maree (1995) indicated that the genetically-significant dose (GSD) for the white, female population in South Africa was considerably higher than the GSD for females in Great Britain, France and the United States of America. Further to this finding, Maree's study …
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Addressing the risks of diagnostic radiology : what should be done about the increasing use of computed tomography in the United States
… US with larger radiation doses than traditional radiology. CT is a powerful tool in the diagnosis of a wide variety of conditions and its use has grown quickly because of its power. CT contributes a significant portion of annual per capita dose in the US. The risk of this additional dose is …
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Machine Learning towards General Medical Image Segmentation
The quality of patient care associated with diagnostic radiology is proportionate to a physician's workload. Segmentation is a fundamental limiting precursor to diagnostic and therapeutic procedures. Advances in machine learning aims to increase diagnostic efficiency to replace single applications …
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Intracranial findings in head injury patients who died at the University Teaching Hospital Lusaka,Zambia
… Intracranial lesions are easily detected by diagnostic radiology such as Carotid Angiography and Computerised Tomography scanning which are lacking at this hospital. Only seven of the eighty patients who died had localising signs on admission and two had exploratory burr hole surgery. In the …
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Effective dose estimation for U.S. Army soldiers undergoing multiple computed tomography scans
… injuries is difficult and involves the use of diagnostic radiological scanning. The primary diagnostic radiology modality used for assessing these injuries is computed tomography (CT). CT delivers more radiation dose than other diagnostic scanning modalities. Trauma patients are at an increased …
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Non-invasive diagnostic methods of intracranial arteries
… arteries, and finally to evaluate the diagnostic accuracy of CTA in non-traumatic subarachnoid haemorrhage (SAH) compared to DSA and to assess the arterial attenuation (HU) as an image quality factor in this aspect. Follow-up DSA and time-of-flight (TOF) MRA at 1.5T and 3T as well as …
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Tomosynthesis in pulmonary cystic fibrosis
… is low. The dedicated scoring system may improve diagnostic precision. At our radiology department, tomosynthesis now has to a great extent replaced radiography in the follow-up of these patients. CT is only performed in selected cases. Further studies are planned to determine the roles of …
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Multi-Level Learning Approaches for Medical Image Understanding and Computer-aided Detection and Diagnosis
… the major research subjects within the area of diagnostic radiology and medical image analysis. This thesis presents two multi-level learning-based approaches for medical image understanding with applications of CAD/CADx. The so-called "multi-level learning strategy" relies on that supervised …
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Diagnostic yield of ultrasound-guided fine needle aspiration biopsy (US-guided FNAB) and post-surgical histopathological correlation of thyroid nodules in the Department of Radiology, Groote Schuur Hospital, Cape Town, South Africa over a two-year period
… Aims: The study aimed to establish the diagnostic yield of US-guided thyroid FNAB's done at Groote Schuur Hospital over two years and to correlate findings with histopathological results in those patients that underwent thyroidectomy. Objectives: The objectives were to establish the …
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A retrospective review of computed tomography pulmonary angiography image quality and the impact on diagnostic outcome at a tertiary South African hospital
… Tomography Pulmonary Angiography (CTPA) is a key diagnostic imaging modality for pulmonary embolism. These studies are technically challenging to perform. Degraded image quality may result from inadequate pulmonary artery contrast opacification, motion- or streak artefact as well as patient …
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Endovascular treatment of post-traumatic carotid-cavernous fistulae with latex detachable balloons
Carotid cavernous fistula (CCF) is an abnormal connection between the carotid artery and the cavernous sinus. The CCF's are usually classified in three ways: 1. Pathologically, as spontaneous or traumatic; 2. Hemodynamically, into high-flow or low-flow; or 3. Angiographically, as direct or …
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Evaluating the yield of brain CT examinations in patients presenting with first onset seizures at the Groote Schuur Hospital, Cape Town
… study was carried out in the Division of Radiology, Groote Schuur Hospital. Patients who presented to the ED with first onset seizures and who underwent brain CT examination as part of their work up between 1 January 2013 and 31 December 2016 were enrolled. All patients presenting to the …
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Predictors of Distress during the Breast Diagnostic Period
… Although distress in women undergoing a breast diagnostic evaluation has been recognized as having the potential to alter treatment outcomes in those diagnosed with cancer, few studies have explored the prevalence or predictors of distress in women undergoing diagnostic evaluations. The purpose …
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Optimization of image quality and radiation dose in neuroradiological computed tomography
… computed tomography (CT) is to produce images of diagnostic quality using the lowest possible radiation exposure. Degradation of image quality, with increased image noise and reduced spatial resolution, is a major limitation for radiation dose reduction in CT. This can be counteracted with new …
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Hyperpolarized 3He-diffusion MRI in evaluation of lung structure in emphysema. Validation and development of the method
Abstract COPD is a major cause of chronic morbidity and mortality throughout the world. It is a preventable and treatable disease. Smoking is the most commonly encountered risk factor for COPD and the habit now unfortunately starts at earlier ages than before. There is a strong necessity to …
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Iterative reconstruction as a novel method of radiation dose reduction at computed tomography in patients with Crohn's disease
… of the highest doses of ionising radiation in diagnostic radiology. Once a medical imaging examination is deemed justified, there is an onus on the imaging team to endeavour to produce diagnostic quality CT images at the lowest possible radiation dose to that patient. The fundamental limitation …
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Origins of Systemic to Pulmonary Collateral Arteries and their Relative Frequencies in Patients with Pulmonary Artery Atresia or Stenosis as determined using Multidetector Computed Tomography Angiography
INTRODUCTION: Critical to the management of pulmonary atresia (PA) or pulmonary stenosis (PS) is accurate and comprehensive knowledge of the vascular network supplying the lungs. This vascular network can be exceedingly complex as it may include a wide variation of systemic to pulmonary collateral …