Quantitativeness and energy resolution of PIM for continuous spectra

Determine the achievable energy resolution and ascertain whether the ptychographic imaging multiplexing (PIM) method maintains quantitative accuracy when applied to a continuous broadband energy spectrum rather than discrete energy channels in X-ray ptychography.

Background

The paper investigates how ptychographic imaging multiplexing (PIM) can separate energy channels in broadband X-ray ptychography and clarifies conditions under which energy separation succeeds, supported by simulations and an experiment using discrete energy acquisitions. While prior work has demonstrated PIM with continuous spectra, the present study constructs and validates its results primarily using discrete energy datasets.

The authors highlight that their experimental validation and many simulations rely on discrete energy channels, and raise the unresolved issue of whether the same quantitative accuracy and energy resolution extend to truly continuous spectra. This gap concerns both the quantitative fidelity of reconstructions and the practical energy resolution that can be achieved when the spectrum is continuous rather than discretized.

References

It is important also to notice that the experimental data is based on discrete energies. While Yao has shown it is possible to apply the multiplexing approach to a continuous spectrum, the energy resolution and whether the quantitativeness of PIM method hold when going from the discrete to the continuum, still needs to be verified.

— Electronvolt energy resolution with broadband ptychography  (2409.00703 - Cipiccia et al., 2024) in Discussion and Conclusions