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      • HARVEST
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      Contribution of noise to the variance of integrating detectors

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      Date
      2010-04
      Author
      Meyer, Thomas Johan
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      X-ray medical imaging provides invaluable medical information, while subjecting patients to hazardous ionizing radiation. The dosage that the patient is exposed to may be reduced, at the cost of image resolution. A technology that promises lower dosage for a given resolution is direct conversion digital imaging, typically based on amorphous Selenium semiconductor. Sufficient exposure should be used for the first exposure to avoid subsequent exposures; a challenge is then to reduce the necessary exposure for a suitable image. To quantify how little radiation the detector can reliably discriminate, one needs an analysis of the variance that 1/f and white noise contribute to the signal of such detectors. An important consideration is that the dark current, which varies with time, is subtracted from the photo-current, to reduce the spurious spatial variance in the image. In this thesis, the variance that 1/f noise contributes to integrating detectors is analysed, for a very general integrating detector. Experiments were performed to verify the theoretical results obtained for the 1/f noise variance contribution.
      Degree
      Master of Science (M.Sc.)
      Department
      Electrical Engineering
      Program
      Electrical Engineering
      Supervisor
      Johanson, Robert E; Kasap, Safa O
      Committee
      Degenstein, Doug; Dinh, Anh van; Chen, Li
      Copyright Date
      April 2010
      URI
      http://hdl.handle.net/10388/etd-04162010-151504
      Subject
      CDS
      X-ray imaging
      1/f noise
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