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Defocus correction and noise reduction using a hybrid ptychography and Centre-of-Mass algorithm.

Zhiyuan Ding1, Chen Huang2, Adrián Pedrazo-Tardajos2

  • 1Department of Materials, University of Oxford, Oxford, UK.

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|August 21, 2025
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Summary
This summary is machine-generated.

A new method, Side Band masked Centre-of-Mass (SBm-COM) and integrated Centre-of-Mass (SBm-iCOM), enhances phase-contrast imaging in 4D Scanning Transmission Electron Microscopy (STEM). This technique reduces noise and compensates for aberrations, improving imaging for challenging samples.

Keywords:
4DSTEMCentre‐of‐MassTEMaberration correctionptychography

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Area of Science:

  • Electron microscopy
  • Materials science
  • Imaging techniques

Background:

  • Integrated Centre-of-Mass (iCOM) is a standard phase-contrast imaging method using 4D Scanning Transmission Electron Microscopy (STEM).
  • Existing methods face limitations with residual aberrations and noise in STEM datasets.

Purpose of the Study:

  • Introduce Side Band masked Centre-of-Mass (SBm-COM) and integrated Centre-of-Mass (SBm-iCOM) for weak-phase object imaging.
  • Improve aberration compensation and noise reduction in 4DSTEM.
  • Enhance low-frequency information transfer in phase-contrast imaging.

Main Methods:

  • Combine Single-Side Band (SSB) ptychography with Centre-of-Mass (COM) and iCOM principles.
  • Develop SBm-COM and SBm-iCOM for analyzing 4DSTEM datasets.
  • Implement aberration compensation and noise filtering up to the 2α resolution limit.

Main Results:

  • SBm-(i)COM effectively compensates for residual aberrations in 4DSTEM data.
  • Noise contribution is significantly reduced, improving image quality.
  • The method is suitable for samples difficult to focus or requiring low electron dose.
  • SBm-iCOM provides an intrinsic transfer function that boosts low-frequency information.

Conclusions:

  • SBm-(i)COM offers a novel and effective approach for phase-contrast imaging in 4DSTEM.
  • This method enhances imaging capabilities for challenging samples and low-dose conditions.
  • SBm-iCOM presents advantages in low-frequency information retrieval compared to standard SSB ptychography.