A phantom-based forward projection approach in support of model-based iterative reconstructions for HAADF-STEM tomography

S. V. Venkatakrishnan; L. F. Drummy; M. A. Jackson; C. A. Bouman; J. P. Simmons; M. De Graef

doi:10.1016/j.ultramic.2015.09.008

A phantom-based forward projection approach in support of model-based iterative reconstructions for HAADF-STEM tomography

S. V. Venkatakrishnan, L. F. Drummy, M. A. Jackson, C. A. Bouman, J. P. Simmons, M. De Graef

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We introduce a forward model for the computation of high angle annular dark field (HAADF) images of nano-crystalline spherical particles and apply it to image simulations for assemblies of nano-spheres of Al, Cu, and Au with a range of sizes, as well as an artificial bi-sphere, consisting of solid hemispheres of Al and Cu or Al and Au. Comparison of computed intensity profiles with experimental observations on Al spheres at different microscope accelerating voltages provides confidence in the forward model. Simulated tomographic tilt series for both HAADF and bright field (BF) images are then used to illustrate that the model-based iterative reconstruction (MBIR) approach is capable of reconstructing sphere configurations of mixed atomic number, with the correct relative reconstructed intensity ratio proportional to the square of the atomic number ratio.

Original language	English
Pages (from-to)	7-17
Number of pages	11
Journal	Ultramicroscopy
Volume	160
DOIs	https://doi.org/10.1016/j.ultramic.2015.09.008
State	Published - Jan 1 2016
Externally published	Yes

Funding

S.V. Venkatakrishnan and C.A. Bouman were supported by an AFOSR/MURI Grant #FA9550-12-1-0458 , by AFRL under the Broad Spectrum Engineered Materials contract (UES, Inc.), and by the Electronic Imaging component of the ICMD program of the Materials and Manufacturing Directorate of the Air Force Research Laboratory , Andrew Rosenberger, program manager. M. De Graef was partially supported by AFRL under the Broad Spectrum Engineered Materials contract (UES, Inc.) and partially by an AFOSR/MURI Grant #FA9550-12-1-0458 . The authors would also like to thank the anonymous reviewers for multiple suggestions that have improved our paper through several revisions.

Funders	Funder number
Andrew Rosenberger
UES, Inc.
Air Force Office of Scientific Research
Air Force Research Laboratory
Multidisciplinary University Research Initiative	9550-12-1-0458

Keywords

Forward model
High angle annular dark field
Image simulation
Nano-particles
Tomographic reconstruction

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10.1016/j.ultramic.2015.09.008

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title = "A phantom-based forward projection approach in support of model-based iterative reconstructions for HAADF-STEM tomography",

abstract = "We introduce a forward model for the computation of high angle annular dark field (HAADF) images of nano-crystalline spherical particles and apply it to image simulations for assemblies of nano-spheres of Al, Cu, and Au with a range of sizes, as well as an artificial bi-sphere, consisting of solid hemispheres of Al and Cu or Al and Au. Comparison of computed intensity profiles with experimental observations on Al spheres at different microscope accelerating voltages provides confidence in the forward model. Simulated tomographic tilt series for both HAADF and bright field (BF) images are then used to illustrate that the model-based iterative reconstruction (MBIR) approach is capable of reconstructing sphere configurations of mixed atomic number, with the correct relative reconstructed intensity ratio proportional to the square of the atomic number ratio.",

keywords = "Forward model, High angle annular dark field, Image simulation, Nano-particles, Tomographic reconstruction",

author = "Venkatakrishnan, {S. V.} and Drummy, {L. F.} and Jackson, {M. A.} and Bouman, {C. A.} and Simmons, {J. P.} and {De Graef}, M.",

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AU - Venkatakrishnan, S. V.

AU - Drummy, L. F.

AU - Jackson, M. A.

AU - Bouman, C. A.

AU - Simmons, J. P.

AU - De Graef, M.

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N2 - We introduce a forward model for the computation of high angle annular dark field (HAADF) images of nano-crystalline spherical particles and apply it to image simulations for assemblies of nano-spheres of Al, Cu, and Au with a range of sizes, as well as an artificial bi-sphere, consisting of solid hemispheres of Al and Cu or Al and Au. Comparison of computed intensity profiles with experimental observations on Al spheres at different microscope accelerating voltages provides confidence in the forward model. Simulated tomographic tilt series for both HAADF and bright field (BF) images are then used to illustrate that the model-based iterative reconstruction (MBIR) approach is capable of reconstructing sphere configurations of mixed atomic number, with the correct relative reconstructed intensity ratio proportional to the square of the atomic number ratio.

AB - We introduce a forward model for the computation of high angle annular dark field (HAADF) images of nano-crystalline spherical particles and apply it to image simulations for assemblies of nano-spheres of Al, Cu, and Au with a range of sizes, as well as an artificial bi-sphere, consisting of solid hemispheres of Al and Cu or Al and Au. Comparison of computed intensity profiles with experimental observations on Al spheres at different microscope accelerating voltages provides confidence in the forward model. Simulated tomographic tilt series for both HAADF and bright field (BF) images are then used to illustrate that the model-based iterative reconstruction (MBIR) approach is capable of reconstructing sphere configurations of mixed atomic number, with the correct relative reconstructed intensity ratio proportional to the square of the atomic number ratio.

KW - Forward model

KW - High angle annular dark field

KW - Image simulation

KW - Nano-particles

KW - Tomographic reconstruction

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JO - Ultramicroscopy

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ER -

A phantom-based forward projection approach in support of model-based iterative reconstructions for HAADF-STEM tomography

Abstract

Funding

Keywords

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