Sökning: "Detective Quantum Efficiency"

Hittade 4 uppsatser innehållade orden Detective Quantum Efficiency.

  1. 1. Detective Quantum Efficiency in the Image Domain

    Master-uppsats, KTH/Fysik

    Författare :Per Lundhammar; [2022]
    Nyckelord :detective quantum efficiency; linear systems theory; projection domain; image domain; x-ray imaging; detektiv kvanteffektivitet; linjär-systemteori; projektionsdomän; bilddomän; röntgenavbildning;

    Sammanfattning : 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

  3. 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 hälsosystem

    Författare :Cassandra Mannila; Marcus Larsson; [2021]
    Nyckelord :Photon Counting Detectors; X-ray Tube Voltage; Filter Thickness; Detective Quantum Efficiency; Optimizing; Fotonräknande detektorer; Rörspänning; Filtertjocklek; DQE; Optimering;

    Sammanfattning : 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

  4. 3. Validation of simulation tool for C-arm X-ray systems : Source and scatter model

    Master-uppsats, KTH/Skolan för teknik och hälsa (STH)

    Författare :Martina Jurcova; [2016]
    Nyckelord :Simulation; C-arm system; X-ray imaging; focal spot; scattering; image sharpness;

    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

  5. 4. Methods for characterization of digital, imageproducing detectors within medical X-ray diagnostics

    Kandidat-uppsats, Blekinge Tekniska Högskola/Avdelningen för signalbehandling

    Författare :Maziar Soltani Emir Medic; [2005]
    Nyckelord :MTF; X- ray; DQE; medecintekniskt; ESF; detectors; röntgen;

    Sammanfattning : 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