Multi-slice ptychography enables high-resolution measurements in extended chemical reactors

Kahnt, Maik; Grote, Lukas; Brückner, Dennis; Seyrich, Martin; Wittwer, Felix; Koziej, Dorota; Schroer, Christian G.

doi:10.1038/s41598-020-80926-6

Cited by 17 publications

(19 citation statements)

References 48 publications

(64 reference statements)

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“…Multislice reconstruction methods will also allow the examination of sample cells that are thicker than the depth of field. 40 …”

Section: Other Aspects Of Spectroptychographymentioning

confidence: 99%

X-ray Spectroptychography

Urquhart

2022

ACS Omega

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X-ray spectroptychography is an emerging method for the chemical microanalysis of advanced nanomaterials such as catalysts and batteries. This method builds upon established synchrotron X-ray microscopy and spectromicroscopy techniques with added spatial resolution from ptychography, an algorithmic imaging technique. This minireview will introduce the technique of X-ray spectroptychography, where ptychography is performed with variable photon energy, and discuss recent results and prospects for this method.

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“…Multislice reconstruction methods will also allow the examination of sample cells that are thicker than the depth of field. 40 …”

Section: Other Aspects Of Spectroptychographymentioning

confidence: 99%

X-ray Spectroptychography

Urquhart

2022

ACS Omega

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“…Implementations of inverse multislice ptychography have been applied for instance in [23][24][25]. The key idea in these studies bears a strong resemblance to extending the established algorithms, such as the extended PIE.…”

Section: Related Workmentioning

confidence: 99%

Inverse Multislice Ptychography by Layer-wise Optimisation and Sparse Matrix Decomposition

Bangun¹,

Melnyk²,

März³

et al. 2022

Preprint

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We propose algorithms based on an optimisation method for inverse multislice ptychography in, e.g. electron microscopy. The multislice method is widely used to model the interaction between relativistic electrons and thick specimens. Since only the intensity of diffraction patterns can be recorded, the challenge in applying inverse multislice ptychography is to uniquely reconstruct the electrostatic potential in each slice up to some ambiguities. In this conceptual study, we show that a unique separation of atomic layers for simulated data is possible when considering a low acceleration voltage. We also introduce an adaptation for estimating the illuminating probe. For the sake of practical application, we finally present slice reconstructions using experimental 4D scanning transmission electron microscopy (STEM) data.

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“…For the vertical direction backward pass from the bottom tiles back to the top tiles in Fig. 4(b), the bottom tiles' accumulated gradient buffers are sent back to GPUs at the center tile row (4,5,6). Then, the accumulated buffers from the bottom tiles replaces the gradient buffers for the center tile row in their overlap region, so that the center row and the bottom tiles have the same gradients in the overlap between the two.…”

Section: Forward and Backward Accumulated Gradients Passmentioning

confidence: 99%

“…With diffraction technology, ptychography removes the theoretical resolution limit determined by microscope lenses and allows microscopic image resolution to be even higher. Therefore, ptychographic imaging sets the current records for the highest microscope resolution and many applications, such as material imaging [2], human biology imaging [3] and security encryption imaging [4], rely on its high resolution to observe features for small particles [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Image Gradient Decomposition for Parallel and Memory-Efficient Ptychographic Reconstruction

Wang,

Tsaris,

Mukherjee

et al. 2022

Preprint

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Ptychography is a popular microscopic imaging modality for many scientific discoveries and sets the record for highest image resolution. Unfortunately, the high image resolution for ptychographic reconstruction requires significant amount of memory and computations, forcing many applications to compromise their image resolution in exchange for a smaller memory footprint and a shorter reconstruction time. In this paper, we propose a novel image gradient decomposition method that significantly reduces the memory footprint for ptychographic reconstruction by tessellating image gradients and diffraction measurements into tiles. In addition, we propose a parallel image gradient decomposition method that enables asynchronous pointto-point communications and parallel pipelining with minimal overhead on a large number of GPUs. Our experiments on a Titanate material dataset (PbTiO 3 ) with 16632 probe locations show that our Gradient Decomposition algorithm reduces memory footprint by 51 times. In addition, it achieves time-to-solution within 2.2 minutes by scaling to 4158 GPUs with a super-linear speedup at 364% efficiency. This performance is 2.7 times more memory efficient, 9 times more scalable and 86 times faster than the state-of-the-art algorithm.This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The publisher acknowledges the US government license to provide public access under the DOE Public Access Plan (http://energy.gov/downloads/doe-publicaccess-plan).

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Multi-slice ptychography enables high-resolution measurements in extended chemical reactors

Cited by 17 publications

References 48 publications

X-ray Spectroptychography

X-ray Spectroptychography

Inverse Multislice Ptychography by Layer-wise Optimisation and Sparse Matrix Decomposition

Image Gradient Decomposition for Parallel and Memory-Efficient Ptychographic Reconstruction

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