Sökning: "non-linear detector response"

Hittade 3 uppsatser innehållade orden non-linear detector response.

  1. 1. Assessment of image quality in x-ray fluoroscopy based on Model observers as an objective measure for quality control and image optimization

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :Henrik Elgström; [2018]
    Nyckelord :image quality; fluoroscopy; Model observer;

    Sammanfattning : BACKGROUND: Although the Image Quality (IQ) indices calculated by objective Model observers contains more favourable characteristics compared to Figure Of Merits (FOM) derived from the more common subjective evaluations of modern digital diagnostic fluoroscopy units, like CDRAD or the Leeds test-objects, practical issues in form of limited access to unprocessed raw data and intricate laboratory measurements have made the conventional computational methods too inefficient and laborious. One approach of the Statistical Decision Variables (CDV) analysis, made available in the FluoroQuality software, overcome these limitations by calculating the SNR2rate from information entirely based on image frames directly obtained from the imaging system, operating in its usual clinical mode. LÄS MER

  3. 2. Investigations on Detector Non-Linear Response for the Optimization of Laser-Induced Phosphorescence Decay-Time Detection.

    Master-uppsats, Lunds universitet/Fysiska institutionen

    Författare :Fahed Abou Nada; [2011]
    Nyckelord :avalanche photodiode; photodetector; non-linear detector response; phosphorescence; thermographic phosphor; photomultiplier tube; decay-time; time-gated detector; Physics and Astronomy;

    Sammanfattning : This thesis investigates the nonlinear detector response to Laser Induced Phosphorescence signal originating from the CdWO4 phosphor. A matrix method is utilized to map the detectors linearity for decay-time determination as function of detector gain and number of photons reaching the detector. LÄS MER

  4. 3. Digital Implementation of a Laser Doppler Perfusion Monitor

    Uppsats för yrkesexamina på grundnivå, Institutionen för systemteknik

    Författare :Ola Larsson; [2006]
    Nyckelord :Digital Laser Doppler DSP Perfusion FFT PSD Perimed;

    Sammanfattning : Under 20 års tid har Perimed AB utvecklat och tillverkat LDPM- och LDPI-instrument som är baserade på en analog filterkonstruktion. De analoga komponenterna i konstruktionen är komplexa och icke-linjära med hänsyn till frekvens och de driver även med temperaturen. LÄS MER