2025/01/21 by Dey, Joyoni, Meyer, Hunter C., Taqi, Murtuza S.
#FOS: Physical sciences #Medical Physics (physics.med-ph) #Optics (physics.optics)
paper · doi:10.48550/arxiv.2501.12527
We propose the use of super-resolution methods for X-ray grating interferometry without an analyzer with detectors that fail to meet the Nyquist sampling rate needed for traditional image recovery algorithms. This method enables Talbot-Lau interferometry without the X-ray absorbing analyzer and allows for higher autocorrelation lengths for the analyzer-less Modulated Phase Grating Interferometer. This will allow for reduced X-ray dose and higher autocorrelation lengths than previously accessible. We demonstrate the use of super-resolution methods to iteratively reconstruct attenuation, differential-phase, and dark-field images using simulations of a one-dimensional lung phantom with tumors. For a fringe period of pD = 22 μm, we compare the simulated imaging performance of interferometers with a 30 μm and 50 μm detector for various signal-to-noise ratios. We show that our super-resolution iterative reconstruction methods are highly robust and can be used to improve grating interferometry for cases where traditional algorithms cannot be used.