Ptycho-Tomography

ALS User's Meeting, Lawrence Berkeley National Laboratory, Berkeley CA, October 3-4, 2018.

Buillding 30- Room: 206 ( Berkeley Lab site map)

Huibin Chang [1], Bjoern Enders[2], Pablo Enfedaque[1], Hari Krishnan[1], Stefano Marchesini [1], David Shapiro [3]

[1] CAMERA, Computational Research Division, [2] STROBE/UC Berkeley, [3] Advanced Light Source

ABSTRACT

Ptychography has enabled in recent years nanometer resolution, macroscopic field of view, and the capability to retrieve chemical, orbital, electronic, or magnetic contrast by reconstruction of both the phase (refractive index) and attenuation coefficients of a sample. The ptycho-tomography reconstruction problem is in principle similar to two dimensional ptychography. In practice, nanoscale imaging and three-dimensional tomographic reconstruction can be challenging because sample drifts are almost inevitable at high resolution, the phase of the tomographic projection may be wrapped around, measurements may have outliers, a fluctuating background, or may be restricted to a limited angular range of sample rotations. Several groups, including other DOE light sources, have developed new solutions to these practical problems. This workshop will serve to strengthen collaborations among the synchrotron x-ray nano-imaging community and offer a forum to discuss practical solutions for routine user operations.