Drift correction in ptychographic diffractive imaging

Coherent X-ray diffractive imaging on the single-cell-level of microbial samples

“…On the algorithmic side, the results can be improved by e.g. correcting for positional errors [20,110,182,307] but on the experimental side this problem is currently mainly approached by increasing the uence, e.g. [111,133,266,286,287,332].…”

“…Moreover, the ptychographic method has also been used for elemental speciation [21,135,285] and for sequential imaging of chemical reactions [142]. More recent ptychographic studies investigate the maximum derivable information from ptychographic data under non-simple experimental conditions for the illuminating wave-eld or the object such as position uncertainties [20,110,182], partial coherence and multiple wavelenghts [15,44,78,299], multiple object planes [181,284] and undersampling of the recorded di racted intensities [71]. In the rst place, however, the probably most important result has been the understanding that the ptychographic method not only is able to solve for the encoded object information but also for the illuminating wave-eld [183,294,296] making ptychography a valuable tool for analysing the wave-elds of X-rays [134,144,159,160,265,268].…”

“…Di erent algorithms and strategies have been combined to allow for positional re nement. Algorithms working on the level of single scan points [20,182,307] have not been considered due to the large overhead in compu-…”

New method for probe position correction for Ptychography

“…15,16 These methods require human intervention and are computationally expensive. If the model of positioning error is known, one can use a method developed by Beckers at al., 18 whereas the "annealing approach" 17 uses the trial and error method. A recent developed technique based on finding the cross correlation of two consecutive object estimates for each probe position is found to be successful for correcting the probe position with sub-pixel accuracy.…”

High-flux ptychographic imaging using the new 55 µm-pixel detector `Lambda' based on the Medipix3 readout chip

“…On the algorithmic side, the results can be improved by e.g. correcting for positional errors (GuizarSicairos & Fienup, 2008;Maiden et al, 2012;Beckers et al, 2013;Tripathi et al, 2014) but on the experimental side this problem is currently mainly approached by increasing the fluence (e.g. Takahashi et al, 2011Takahashi et al, , 2013Guizar-Sicairos et al, 2012;Holler et al, 2012;Schropp et al, 2012;Wilke et al, 2013).…”