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