Parallel ptychographic reconstruction

Ptychography is an imaging method whereby a coherent beam is scanned across an object, and an image is obtained by iterative phasing of the set of diffraction patterns. It is able to be used to image extended objects at a resolution limited by scattering strength of the object and detector geometry,...

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Bibliographic Details
Published in:Optics express 2014-12, Vol.22 (26), p.32082-32097
Main Authors: Nashed, Youssef S G, Vine, David J, Peterka, Tom, Deng, Junjing, Ross, Rob, Jacobsen, Chris
Format: Article
Language:English
Subjects:
Algorithms
Image Enhancement - instrumentation
Image Enhancement - methods
Image Interpretation, Computer-Assisted - instrumentation
Image Interpretation, Computer-Assisted - methods
Image reconstruction techniques
MATHEMATICS AND COMPUTING
Microscopy - instrumentation
Microscopy - methods
Parallel processing
Phase retrieval
Refractometry - instrumentation
Refractometry - methods
Reproducibility of Results
Sensitivity and Specificity
Signal Processing, Computer-Assisted
X-ray imaging
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Summary:Ptychography is an imaging method whereby a coherent beam is scanned across an object, and an image is obtained by iterative phasing of the set of diffraction patterns. It is able to be used to image extended objects at a resolution limited by scattering strength of the object and detector geometry, rather than at an optics-imposed limit. As technical advances allow larger fields to be imaged, computational challenges arise for reconstructing the correspondingly larger data volumes, yet at the same time there is also a need to deliver reconstructed images immediately so that one can evaluate the next steps to take in an experiment. Here we present a parallel method for real-time ptychographic phase retrieval. It uses a hybrid parallel strategy to divide the computation between multiple graphics processing units (GPUs) and then employs novel techniques to merge sub-datasets into a single complex phase and amplitude image. Results are shown on a simulated specimen and a real dataset from an X-ray experiment conducted at a synchrotron light source.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.032082