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 5 of 5 for “"automatic exposure control"”.
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Image Quality Optimisation and Dose Management in CT, SPECT/CT, and PET/CT
… PET, has raised concerns about patient radiation exposure and the consequent increased risk of malignancy later in life. The overall objective of this work was to evaluate and optimise different approaches for minimising patient radiation absorbed dose and maintaining or improving image quality in …
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Assessment and optimisation of digital radiography systems for clinical use
… in applying such measurements to routine quality control and this project initially focuses on obtaining NPS and MTF results for 12 IDR systems in routine clinical use. Appropriate automatic exposure control (AEC) device calibration and a reproducible measurement method are key to optimising X-ray …
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Optimisation of radiation dose and image quality for AP pelvis radiographic examination
… design. The optimisation includes manual and automatic exposure control modes. The image quality is visually assessed using the previously developed (novel) image quality scale and physically using a signal to noise ratio. The optimisation work is conducted with the aim of achieving two …
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An investigation into methods for dose optimisation for paediatric AP pelvis projections when considering size variations
… age. Systematic variations (factorial design) of exposure factors (kVp, mAs, SID and additional filtration) were conducted to acquire AP pelvis X-ray images. Images for the 1 and 5-year-old phantom were acquired with manual exposure control. While the images for the 10-year-old were acquired with …
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Organ dose determination in X-ray imaging
… radiation qualities used in patient and phantom exposures were studied. For fetal dose estimation, fetal dose conversion coefficients were determined based on phantom measurements in CT and dental radiography examinations. Additionally, the effect of lead shields on fetal and breast doses was …