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Optimized THL Masks for the Medipix Quad: CT with Ring Artefacts, Noise Equalization, and Mask Quality

Learn about the optimization of THL masks for the Medipix Quad to address ring artifacts in CT scans. This study explores the impact of variations in lower thresholds on counting behavior, offers solutions to ring artifacts, and analyzes mask quality parameters. Discover how noise equalization and flatfields can enhance image quality and precise calculations for optimum THS. Improve your understanding of mask quality as a count rate-independent parameter for image fidelity.

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Optimized THL Masks for the Medipix Quad: CT with Ring Artefacts, Noise Equalization, and Mask Quality

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  1. Optimized THL-Masks for the Medipix-Quad 04. 05. 2006 Frank Nachtrab frank.nachtrab@physik.uni-erlangen.de Physikalisches Institut, Abt. IV Friedrich-Alexander-Universität Erlangen

  2. CT with the Quad

  3. Ringartefacts in CT Problem: variations in lower threshold lead to differing counting behavior for every pixel (‘gain’) -> ringartefacts in computed tomography

  4. Equalization with Noise

  5. Equalization using Flatfields Histogram of Flatfields: THL-maskbit 0, 7; different THS -> calculate width and distance of distributions

  6. Optimum THS linear fit of right boundary of bit0-distribution vs THS -> OptimumTHS (for every Chip on the Quad!)

  7. Maskquality - Definition Countrate independent parameter for maskquality!

  8. Maskquality

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