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Open Access

AutoGDeterm: Automatic Geometry Determination for Electron Tomography

High Performance Computer Research Center, ICT, CAS, Beijing 100101, China.
University of Chinese Academy of Sciences, Beijing 100101, China.
Center for Biological Imaging, IBP, CAS and the National Key Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Beijing 100101, China.
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Abstract

Electron Tomography (ET) is an important method for studying cell ultrastructure in three-dimensional (3D) space. By combining cryo-electron tomography of frozen-hydrated samples (cryo-ET) and a sub-tomogram averaging approach, ET has recently reached sub-nanometer resolution, thereby realizing the capability for gaining direct insights into function and mechanism. To obtain a high-resolution 3D ET reconstruction, alignment and geometry determination of the ET tilt series are necessary. However, typical methods for determining geometry require human intervention, which is not only subjective and easily introduces errors, but is also labor intensive for high-throughput tomographic reconstructions. To overcome these problems, we have developed an automatic geometry-determination method, called AutoGDeterm. By taking advantage of the high-contrast re-projections of the Iterative Compressed-sensing Optimized Non-Uniform Fast Fourier Transform (NUFFT) reconstruction (ICON) and a series of numerical analysis methods, AutoGDeterm achieves high-precision fully automated geometry determination. Experimental results on simulated and resin-embedded datasets show that the accuracy of AutoGDeterm is high and comparable to that of the typical “manual positioning” method. We have made AutoGDeterm available as software, which can be freely downloaded from our website http://ear.ict.ac.cn.

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Tsinghua Science and Technology
Pages 369-376
Cite this article:
Chen Y, Wang Z, Li L, et al. AutoGDeterm: Automatic Geometry Determination for Electron Tomography. Tsinghua Science and Technology, 2018, 23(4): 369-376. https://doi.org/10.26599/TST.2018.9010036

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Received: 06 September 2017
Accepted: 01 November 2017
Published: 16 August 2018
© The authors 2018
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