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Optimized THL-Masks for the Medipix-Quad 04. 05. 2006 Frank Nachtrab

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. CT with the Quad. Ringartefacts in CT.

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Optimized THL-Masks for the Medipix-Quad 04. 05. 2006 Frank Nachtrab

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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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