High-speed Fly-Scan Volumetric Imaging

Fly-scan, i.e. acquiring data while motors are moving, has been shown to improve scanning speeds dramatically both for full-field and scanning-probe X-ray microscopy systems. Although scanning can be continuous, current tomographic reconstruction methods assumes that the data are taken at discrete time intervals. This yields motion-blur artifacts in reconstructed images, if the exposure times are longer, or if the probe is moving faster, than the highest setting of the detector read-out times. For object recovery in this high-speed imaging setting, long exposure durations can be represented by multiplexing of a series of short exposure photon detection processes. To this end, the existing iterative reconstruction methods were modified to incorporate multiplexed probe geometries, and simulation tests were performed to evaluate the feasibility of object recovery in the case of high-speed rotational fly-scanning scheme.