FAST-EM array tomography: a workflow for multibeam volume electron microscopy

Area of Science:

• Cell Biology
• Microscopy
• Biophysics

Background:

• Understanding complex biological processes requires high-resolution 3D nanoscale imaging of cells and tissues.
• Traditional electron microscopy (EM) provides necessary resolution but suffers from low throughput, limiting large-volume imaging.
• Overcoming throughput limitations is crucial for advancing biological research using EM.

Purpose of the Study:

• To introduce a novel workflow for high-throughput volume electron microscopy (EM).
• To present FAST-EM, a multibeam scanning transmission electron microscope designed for parallel data acquisition.
• To demonstrate the capability of FAST-EM for reconstructing large, high-resolution 3D ultrastructural datasets.

Main Methods:

• Development and implementation of FAST-EM, a 64-beam scanning transmission electron microscope.
• Utilizing optical detection to separate signals from parallel electron beams.
• Establishing a workflow for parallel acquisition and 3D reconstruction of ultrastructural data.

Main Results:

• Demonstrated parallel acquisition of ultrastructural data using 64 electron beams.
• Successfully performed 3D reconstruction of multiple biological samples.
• Achieved large reconstructed volumes with high resolution and contrast.

Conclusions:

• The FAST-EM workflow significantly enhances throughput for volume EM.
• Enables high-resolution, large-scale 3D imaging of biological ultrastructure within feasible timeframes.
• Addresses key limitations in current EM techniques for biological research.