Propagation-based and mesh-based x-ray quantitative phase imaging with conventional sources

摘要

The contrast in conventional x-ray imaging is generated by dierential attenuation of x rays, which is generallyvery small in soft tissue. Phase imaging has been shown to improve contrast and signal to noise ratio (SNR)by factors of 100 or more. However, acquiring phase images typically requires a highly spatially coherent source(e.g. a 50 μm or smaller microfocus source or a synchrotron facility), or multiple images acquired with preciselyaligned gratings. Here we demonstrate two phase imaging techniques compatible with conventional sources:polycapillary focusing optics to enhance source coherence and mesh-based structured illumination.