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Optimising THL-Masks for the Medipix-Quad May, 4 th 2006 Frank Nachtrab

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Optimising THL-Masks for the Medipix-Quad May, 4 th 2006 Frank Nachtrab [email protected] Physikalisches Institut, Abt. IV Friedrich-Alexander-Universität Erlangen. medipix2. detector. MUROS 2.1. translation. rotation stage with. stages. object plate.

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slide1

Optimising THL-Masks

for the Medipix-Quad

May, 4th 2006

Frank Nachtrab

[email protected]

Physikalisches Institut, Abt. IV

Friedrich-Alexander-Universität Erlangen

medipix2 ct setup in erlangen

medipix2

detector

MUROS 2.1

translation

rotation stage with

stages

object plate

X-ray tube

Medipix2 CT setup in Erlangen
  • Three translation stages (1 µm resolution)
  • One rotation stage(0.1 degree resolution)
  • MUROS 2.1
  • Distances:
    • Focus-detector: 768mm
    • Focus-object plate: 635mm
  • Tungsten X-ray tube:
    • standard diagnostic tube
    • tube voltage 40 – 125 kV
ring artefacts in ct
Ring artefacts in CT

Problem: variations in lower threshold lead to differing counting behavior for every pixel (‘gain’)

→ ring artefacts in computed tomography

equalisation using flatfield images
Equalisation using Flatfield Images

Histogram of Flatfields: THL-maskbit 0, 7; different THS

→ calculate width and distance of distributions

optimum ths quad
Optimum THS - Quad

Linear fit of right boundary of bit0-distribution vs THS

→ OptimumTHS (for each Chip on the Quad!)

mask quality definition
Mask quality - Definition

Countrate independent parameter for mask quality!

(lower is better; zero for a perfect detector)

mask quality single chip
Mask quality Single Chip
  • All THL-Masks worse for higher thresholds
  • Flatfieldmasks better by a factor of ~ 1.35
outlook
Outlook
  • five different THS Values instead of three → quadratic fit?
  • tune FBK settings after generation of mask for better global homogeneity
  • automate procedure → Pixelman plugin?
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