Coherent Diffractive Imaging (CDI) uses a coherent x-ray beam to illumunate a sample and retrieve the phase information on the sample from phase-retrival analysis of the far-field diffraction pattern.
Of the many CDI variants developed ptychography has been shown to be the most robust and is a scanning technique where diffraction information is collected from overlapping regions and used to reconstruct the sample phase properties.
The advantage of ptychography is that the spatial resolution achieved can be higher than that achieved with conventional optics.
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