Transverse Sheet Illumination for Fast Multi-Plane Confocal Imaging
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Solution Overview
Problem
Conventional confocal microscopes are limited by slow scanning rates, lacking the ability to achieve high-spatial and high-temporal resolution simultaneously, particularly in neurophysiological studies where millisecond temporal resolution is required for neuronal firing patterns.
Innovation Solution
Transverse Sheet Illumination Microscopy (TranSIM) employs axially illuminated multiple plane imaging, using spatially separated beams to simultaneously image multiple z-planes, increasing temporal resolution by remapping planes onto a sensor, and utilizing a simplified multiplexing mechanism with a linear reflection cavity or one camera configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional confocal microscopes scan a single plane sequentially, then spatial resolution is maintained, but temporal resolution deteriorates due to slow scanning rates
Solution Approach 1:
The illumination beam is segmented into multiple transverse light sheets using a diffraction grating, allowing simultaneous illumination of multiple z-planes. Each light sheet corresponds to a specific focal plane, enabling parallel acquisition of multiple planes without sequential scanning, thus improving temporal resolution while maintaining spatial resolution through the confocal detection mechanism.
Solution Approach 2:
The patent introduces an additional dimension by tilting the light sheets relative to the detection axis. This angular arrangement allows multiple planes to be illuminated simultaneously at different depths while maintaining confocal detection geometry. The tilted sheets create distinct focal planes along the z-axis that can be imaged in parallel, resolving the contradiction between spatial and temporal resolution.
2Speed
If multiple light sheets are used to illuminate multiple planes simultaneously, then temporal resolution improves, but optical sectioning capability deteriorates due to out-of-focus light
Solution Approach 1:
A diffraction grating is introduced as an intermediary element to generate multiple transverse light sheets from a single illumination beam. The grating creates spatially separated sheets at different angles, each focused at a specific z-plane. This intermediary structure enables precise control over the illumination geometry, ensuring that only the intended focal plane receives light while maintaining high imaging speed through simultaneous multi-plane illumination.
Solution Approach 2:
Each light sheet is locally optimized to illuminate only its specific focal plane with high intensity, while other regions receive minimal or no illumination. The tilted geometry and confocal detection arrangement ensure that out-of-focus regions are excluded from detection, maintaining optical sectioning quality even when multiple planes are imaged simultaneously.
3Productivity
If transverse light sheets are tilted at an angle, then multiple planes can be illuminated simultaneously improving productivity, but system complexity increases
Solution Approach 1:
The diffraction grating automatically generates the tilted light sheet geometry through its inherent diffraction properties. The system leverages the natural angular separation of diffracted orders to create multiple illuminated planes without requiring additional active control elements. This self-organizing optical configuration simplifies the overall system while achieving high productivity through simultaneous multi-plane imaging.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
TranSIM achieves high-resolution imaging up to 100 times faster than conventional 3D scanning microscopes, providing 1 µm spatial resolution and millisecond temporal resolution, suitable for brain-wide neurodynamics and biological samples.
Implementation Method 1
illuminates several planes by spatially separating multiple beams in depth (Z) and laterally (Y) so that the planes can then be separated
Implementation Method 2
recording images of fluorescence emitted along a detection direction from the sample due to the optical interaction between the one or more light sheets and the sample
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Methods and apparatus for transverse sheet illuminated multiple plane imaging that can achieve simultaneous imaging of multiple z-planes in a laser scanning confocal fluorescence microscope.