Sökning: "detective quantum efficiency"
Hittade 4 uppsatser innehållade orden detective quantum efficiency.
1. Detective Quantum Efficiency in the Image Domain
Master-uppsats, KTH/FysikSammanfattning : We investigate the signal and noise transform characteristics from the projection domain to the image domain in a linear systems theory framework and predictions of the DQE within this framework are made. A simulation study of a photon counting silicon detector is made from which the energy information is used in order to produce synthetic monoenergetic images. LÄS MER
2. Evaluation of the Impact of X-ray Tube Voltage and Filter Thickness on the Performance of Spectral Photon-Counting Detectors
Kandidat-uppsats, KTH/Medicinteknik och hälsosystemSammanfattning : During the past years photon-counting detectors (PCDs) have emerged as an alternative to conventional energy-integrating detectors and may significantly improve the standard of care for computed tomography (CT). There are two main alternatives for the material of the detector: cadmium telluride (CdTe) and silicon (Si). LÄS MER
3. Validation of simulation tool for C-arm X-ray systems : Source and scatter model
Master-uppsats, KTH/Skolan för teknik och hälsa (STH)Sammanfattning : Continuous improvement of image quality is one of the priorities in medical imaging. Therefore, development of a simulation tool allowing to generate realistic images would be of great value to understand better the impact of the components on the image quality metrics and to choose imaging set-ups or new design features to optimize output of existing systems and to prototype new ones and to formalize the link between objective and subjective image quality metrics. LÄS MER
4. Methods for characterization of digital, imageproducing detectors within medical X-ray diagnostics
Kandidat-uppsats, Blekinge Tekniska Högskola/Avdelningen för signalbehandlingSammanfattning : Since the end of the 1900th century ionized radiation, foremost X-ray radiation, have been used, with great success, within the medical field as a method for diagnostics as well as for therapeutically treatments. When it comes to X- ray diagnostics, the analogue film, detector and display medium have, in principle, been used the whole time. LÄS MER