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.
Results
Showing 1 to 20 of 163 for “"Radiation dose"”.
-
Radiation dose assessment : measurement, estimation and interpretation
… are often accompanied with additional radiation dose yet this can be justified through the consideration of the benefit it brings. Examples include the use of CT colonography instead of double contrast barium enemas, CT urography replacing intravenous urography and, in nuclear medicine …
-
Radiation dose to the global flying population
… and crew are exposed to elevated levels of radiation relative to being at sea level. Previous studies have assessed the radiation dose received in particular cases or for cohort studies. Here we present the first estimate of the total radiation dose received by the worldwide civilian flying …
-
Radiation Dose Estimation for Pediatric Patients Undergoing Cardiac Catheterization
… catheterization are potentially at risk of radiation-induced health effects from the interventional fluoroscopic X-ray imaging used throughout the clinical procedure. The amount of radiation exposure is highly dependent on the complexity of the procedure and the level of optimization in …
-
Radiation dose measurement and prediction for linear slit scanning radiography
This study describes dose measurements made for linear slit scanning radiography (LSSR) and a dose prediction model that was developed for LSSR. The measurement and calculation methods used for determining entrance dose and effective dose (E) in conventional X-ray imaging systems were verified for …
-
ENVIRONMENTAL RADIATION DOSE ASSESSMENT AND VALIDATION FOR URANIUM HEXAFLUORIDE STORAGE MANAGEMENT
… methodology for performing environmental radiation dose assessment for storage of a large number (thousands) of uranium hexafluoride (UF6) cylinders in an outdoor storage area. The primary objective was to substantially improve the Monte Carlo computational efficiency by an order of …
-
Optimization of image quality and radiation dose in neuroradiological computed tomography
… 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 post-processing image filters and iterative …
-
Optimisation of radiation dose and image quality for AP pelvis radiographic examination
Background and rationale:Optimising radiation dose and image quality in medical imaging is essential in minimising radiation risk and ensuring images are fit for purpose. This thesis uses novel methods for image quality assessment and radiation dose/image quality optimisation. The antero-posterior …
-
Application of shortest path algorithms to find paths of minimum radiation dose
… environments such that the accumulated dose is minimal. Such paths will be very useful for personnel whose job requires them to navigate through contaminated areas such as nuclear facility workers and emergency response personnel who need to respond to events which occur in nuclear …
-
Radiation dose optimization in interventional radiology and cardiology using diagnostic reference levels
… procedures to avoid unnecessary stochastic radiation risk. The increase in complexity of interventional procedures, combined with a lack of specialist training on radiation techniques, poses a significant risk to patients. These risks have not gone unnoticed by government authorities …
-
Optimising image quality and radiation dose with a focus on geometry and attenuation
… acquiring images of diagnostic quality and the radiation dose received by the patient. Pragmatic, simple and effective methods are essential to ensure that optimisation techniques are adopted into clinical practice.The six papers presented within this thesis explore geometry and/or attenuation …
-
Establishing an evidence-base for erect pelvis radiography : positioning, radiation dose and image quality
… will include assessing radiographic positioning, radiation dose and image quality. Methods: The experimental work described in this thesis was conducted in three phases. Each phase has its own methods with the purpose of achieving a specific set of aims. Phase One was the evaluation of the …
-
Reducing radiation dose for a linear slot scanning digital X-ray machine using a filtration technique
… slotscanning digital X-ray system to reduce radiation dose to paediatric patients whilst preserving diagnostic image quality. The Statscan is an FDA approved, commercially available digital X-ray system commonly used for trauma and emergency patients. The Statscan provides significantly lower …
-
Iterative reconstruction as a novel method of radiation dose reduction at computed tomography in patients with Crohn's disease
… group, that quantified the alarming levels of radiation dose to patients with Crohn’s disease from medical imaging and the notable shift towards CT imaging making these patients an at risk group, provided context for this work. CT delivers some of the highest doses of ionising radiation in …
-
AP pelvis x-ray imaging on a trolley: the impact of trolley design, mattress design and radiographer practices on image quality and radiation dose
… and radiographer practice on image quality and radiation dose for AP pelvis imaging on a trolley in order to optimise this imaging examination. AP pelvis was chosen as the focus of this thesis due to the frequency of this examination on a trolley and the dose implication associated with …
-
A comparison of fixed tube current (FTC) and automatic tube current modulation (ATCM) CT methods for abdominal scanning : implications on radiation dose and image quality
… years. This has contributed to an increase in radiation dose administered to patients. Abdominal CT scans generally require higher exposure factors when compared to other anatomical regions. This drives a need for urgent optimisation of the radiation dose and image quality for abdominal CT …
-
Fault-tolerant passively integrating in-vivo dosimeters for feedback-enabled proton therapy (IF²D, or integrating feedback F-center dosimeter)
… for cancer treatment fail to distinguish between radiation received by the targeted tumor and the surrounding healthy tissue. The Integrating Feedback F-center Dosimeter is designed to be fault-tolerant, with the capability to distinguish the radiation dose received between a targeted tumor and …
-
A comparative study evaluating the performance of diagnostic radiography units and protocols for paediatric and adult chest radiography examinations
… about the variations in image quality (IQ) and radiation dose for paediatric and adult chest radiography (CXR), between and within hospitals. Large variations in IQ could influence the diagnostic accuracy, and variations in radiation dose could affect the risk to patients. This thesis aims to …
Page 1 of 9