Volumetric Lissajous confocal microscopy with tunable spatiotemporal resolution

Area of Science:

• Optical Microscopy
• Biophysics
• Cell Biology

Background:

• Dynamic biological systems require advanced 3D optical microscopy capable of adapting to rapid temporal and spatial changes.
• Conventional confocal microscopy techniques often lack tunability in acquisition parameters, leading to suboptimal imaging of fast-moving biological processes.
• Rigid scanning rates and pixel dwell times in existing methods hinder the capture of dynamic events in biological samples.

Purpose of the Study:

• To develop a volumetric Lissajous confocal microscopy system with enhanced 3D scanning speed and tunable sampling rates.
• To overcome the limitations of fixed acquisition parameters in traditional microscopy for imaging dynamic biological systems.
• To enable high-speed, high-resolution 3D imaging of biological processes at the cellular level.

Main Methods:

• Integration of an acoustic liquid lens for continuous axial focus translation with a resonant scanning mirror.
• Implementation of a dynamic Lissajous trajectory for the excitation beam, enabling sub-millisecond 3D data acquisition.
• Utilizing sub-Nyquist sampling rates combined with temporal accumulation and advanced interpolation algorithms for selectable volumetric imaging rates.

Main Results:

• Demonstrated multicolor and calcium imaging in volumes of tens of cubic microns.
• Achieved 3D acquisition speeds of 30 Hz and frame rates up to 5 kHz.
• The developed system offers selectable spatiotemporal resolution through post-processing for specific biological events.

Conclusions:

• Volumetric Lissajous confocal microscopy provides unprecedented 3D scanning speed and tunability for dynamic biological imaging.
• The system's flexibility in acquisition and post-processing allows for optimized imaging of fast biological events.
• This technology advances the capability to study complex cellular dynamics in three dimensions with high temporal resolution.