Road to micron resolution with a color X-ray camera – polycapillary optics characterization

Road to micron resolution with a color X-ray camera – polycapillary optics characterization

Citation

Nowak, S.H., Petric, M., Buchriegler, J. et al. Road to micron resolution with a color X-ray camera – polycapillary optics characterization. 

Keywords

  • X-ray fluorescence (XRF)
  • Polycapillary optics
  • Spatial Resolution
  • Color X-ray camera
  • Subpixel resolution
  • Point Spread Function (PSF)
  • Contrast Transfer Function (CTF)
  • Siemens star
  • Chromatic aberration

Brief

The resolving power of polycapillary optics used in x-ray fluorescence imaging can approach 1 μm by reducing the capillary channel diameter and minimizing the halo effect. 

Summary

The article discusses a color X-ray camera that achieves spatial resolution using a polycapillary optic, which directs X-ray photons from a sample to specific pixels on a CCD matrix. The resolution of this camera is primarily limited by the size of the polycapillary channels and can be improved by using a subpixel resolution algorithm that divides the signal from each physical pixel into multiple virtual subpixels.

The article discusses factors that impact the resolution of the color X-ray camera including:

  • Pixel Size: The traditional limiting factor, which can be mitigated using a subpixel resolution algorithm
  • Channel Diameter: Smaller channel diameters lead to better resolution, with a theoretical limit of twice the channel diameter
  • Sample-Optic Distance: Reducing this distance improves resolution, particularly for magnifying optics
  • X-Ray Energy: Higher X-ray energies result in better resolution due to a smaller critical angle of total reflection
  • Magnifying Optics: Conical optics with magnification can improve resolution but can also introduce issues like halo effects

The sources don't specify the year of publication.

Origin: https://www.semanticscholar.org/reader/fdc85b9db1599da3cc92c15b5738e3a344fe6002

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