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Improved specimen reconstruction by Hilbert phase contrast tomography.

Bastian Barton1, Friederike Joos, Rasmus R Schröder

  • 1Max Planck Institute of Biophysics, Department of Structural Biology, Max-von-Laue-Str. 3, D-60438 Frankfurt am Main, Germany. Bastian.Barton@mpibp-frankfurt.mpg.de

Journal of Structural Biology
|August 30, 2008
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Summary

Low signal-to-noise in electron tomography images hinders 3D reconstruction. Hilbert phase plates improve contrast and signal-to-noise ratio for biological specimens, enabling clearer molecular details.

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Area of Science:

  • Microscopy and Imaging
  • Structural Biology
  • Electron Tomography

Background:

  • Conventional electron tomography (ET) suffers from low signal-to-noise ratio (SNR) due to defocus phase contrast, limiting 3D volume interpretation.
  • High defocus in conventional ET enhances contrast but restricts information transfer, hindering molecular resolution of biological specimens.
  • Optimal contrast and SNR are crucial for reconstructing macromolecular assemblies in biological samples using ET.

Purpose of the Study:

  • To introduce and evaluate the use of Hilbert phase plates (HPP) for in-focus electron tomography of biological specimens.
  • To demonstrate the technical feasibility and routine applicability of HPP in electron tomography.
  • To compare the performance of HPP-based tomography with conventional defocus methods.

Main Methods:

  • Utilizing a Hilbert phase plate in the objective lens's back focal plane for in-focus image acquisition.
  • Recording tilt series of biological specimens with the HPP in Gaussian focus.
  • Reconstructing 3D volumes from HPP image series and comparing them with conventional defocus tomograms.

Main Results:

  • In-focus Hilbert phase contrast (HPC) provides optimized positive phase contrast at low spatial frequencies, extending contrast transfer to the microscope's information limit.
  • HPC images can be numerically converted to isotropic contrast, equivalent to Zernike phase contrast, offering optimal structure factor information without transfer function limitations.
  • Electron tomograms reconstructed from HPP image series exhibit enhanced SNR and improved specimen visibility compared to conventional defocus tomograms.

Conclusions:

  • Hilbert phase plates offer a viable solution to the low contrast and SNR issues in electron tomography of biological samples.
  • In-focus HPC electron tomography provides superior image quality and detail for reconstructing macromolecular structures at molecular resolution.
  • The HPP technique is technically implementable and routinely applicable for advanced electron tomography applications.