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Seminar - Coherent X-ray Imaging: CDI, Ptychography and GPU-accelerated data analysis with PyNX

May 27, 2019 14h • Amphitheater of SOLEIL


(X-Ray NanoProbe group, Co-editor J. Synchrotron Radiation, Director HERCULES school, ESRF, Grenoble, France)


For the last 20 years synchrotron sources have produced brighter and more coherent X-ray beams. This has allowed the development of Coherent X-ray Imaging techniques which yield a resolution which is neither limited by the X-ray beam size, nor by the pixel size on the detector. 

In this presentation, after introducing the different techniques, I will present the PyNX software currently developed at ESRF (, which uses Graphical Processing Units (GPU) to provide 1 to 2 orders of magnitude acceleration in data analysis throughput. I will show:

- the tools already available with the choices in algorithms

- how the python library can be easily extended to new algorithms using an Operator-based approach (without any knowledge in GPU programming)

Examples will include Coherent Diffraction Imaging (in the small-angle and Bragg regimes), Ptychography (near field and far field, small angle and Bragg).


Entrance formalities:

Free access in the auditorium of the Reception building.
If the manifestation takes place in the main building thank you for providing an ID card (to exchange at the reception for an access pass)


Contact: Sandrine Vasseur