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Serial Block-Face Scanning Electron Microscopy SBF-SEM of Biological Tissue Samples
Published on: March 26, 2021
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Biological serial block face scanning electron microscopy at improved z-resolution based on Monte Carlo model.
1National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, MD, 20892, USA.
Scientific Reports
|August 30, 2018
Summary
Serial block-face electron microscopy (SBEM) improves 3D ultrastructure imaging. By analyzing dual-energy backscattered electron signals, this method enhances z-resolution for detailed cellular and tissue analysis.
Area of Science:
- Microscopy and Imaging Technologies
- Cell Biology
- Biophysics
Background:
- Serial block-face electron microscopy (SBEM) is a powerful technique for nanoscale 3D ultrastructure imaging.
- SBEM achieves high xy resolution but is limited in z-resolution (around 25 nm) due to ultramicrotome cutting thickness.
Purpose of the Study:
- To enhance the axial (z-direction) resolution in SBEM.
- To develop a method for extracting depth information from SBEM datasets.
- To improve the 3D reconstruction accuracy of biological samples.
Main Methods:
- Acquired backscattered electron (BSE) images at dual primary beam energies (1-3 keV).
- Utilized Monte Carlo simulations to model electron scattering and extract depth information.
- Correlated the ratio of dual-energy BSE intensities with stain depth.
Main Results:
- Achieved a twofold improvement in z-resolution compared to conventional SBEM.
- Successfully demonstrated sub-slice imaging of hepatocyte membranes in liver tissue.
- Validated the depth extraction method through simulations and experimental data.
Conclusions:
- The dual-energy BSE intensity ratio method effectively improves z-resolution in SBEM.
- This technique offers enhanced 3D structural analysis capabilities for biological samples.
- Provides a valuable advancement for nanoscale imaging in cell biology and tissue research.
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