SCAPE Microscopy Single-Objective Volumetric Imaging
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Solution Overview
Problem
Current 3D volumetric optical microscopy techniques, such as light-sheet and two-photon microscopy, face limitations in speed, resolution, and field of view due to dual-objective geometries and the need for physical sample translation or complex synchronization, making it challenging to capture high-speed, in-vivo neuronal activity and dynamic processes in diverse samples.
Innovation Solution
The Swept, Confocally-Aligned Planar Excitation (SCAPE) microscopy method uses a single objective to sweep an oblique light sheet across the sample, allowing for ultra-fast, translationless volumetric imaging by aligning the detection plane with the illumination sheet and using image rotation optics to maintain a stationary camera, enabling high-speed capture of 3D dynamics in intact samples without physical sample movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional light-sheet imaging uses dual-objective geometry with side-on illumination and physical sample translation, then 3D volumetric imaging can be achieved, but imaging speed is limited and sample mounting becomes highly challenging
Solution Approach 1:
The patent inverts the conventional light-sheet geometry by rotating it 45 degrees and implementing it through a single objective lens rather than dual objectives. This allows the light sheet to sweep across the sample volume while the detection plane remains stationary, eliminating the need for physical sample translation and complex mounting arrangements.
Solution Approach 2:
The patent replaces the mechanical sample translation system with an optical scanning system. Instead of physically moving the sample through the detection plane, a scanning mirror deflects the light sheet across the sample volume, achieving volumetric imaging without mechanical movement of the sample or detection objective.
2Productivity
If piezoelectric objective scanning is used for volumetric imaging, then 3D imaging can be achieved, but acquisition speeds are limited
Solution Approach 1:
The patent replaces piezoelectric objective scanning with a stationary objective and a scanning light sheet system. A scanning mirror deflects the excitation light sheet across the sample volume while the detection objective remains fixed, eliminating the need for fast piezoelectric scanning and enabling higher acquisition speeds.
Solution Approach 2:
The patent introduces a scanning mirror as an intermediary element between the light source and the sample. This mirror deflects the light sheet across the sample volume, enabling volumetric scanning without moving the detection objective, thus decoupling the scanning function from the detection system.
3Measurement precision
If two-photon microscopy uses sequential point scanning to generate volumetric images, then high resolution can be achieved, but imaging speed forces trade-offs between 3D imaging speed, resolution and field of view
Solution Approach 1:
The patent transitions from sequential point scanning (1D time dimension) to planar light sheet illumination (2D spatial dimension). By illuminating an entire plane simultaneously with a light sheet and detecting it with a 2D camera, the system achieves parallel acquisition of multiple points, dramatically increasing volumetric imaging speed while maintaining resolution through optical sectioning.
Solution Approach 2:
The patent enables continuous illumination of the entire sample volume with a swept light sheet, allowing the camera to continuously capture images at every position along the sweep. This continuous acquisition method eliminates the sequential nature of point scanning, enabling high-speed volumetric imaging without sacrificing resolution or field of view.
4Productivity
If coordinated scanning of the light sheet with translation of the detection focal plane is used, then higher frame rate light sheet imaging can be achieved, but the dual-objective geometry remains limiting
Solution Approach 1:
The patent inverts the conventional approach by keeping the detection objective stationary and scanning the light sheet instead. This single-objective configuration eliminates the need for coordinated translation of the detection focal plane and removes the limitations of dual-objective geometry while maintaining high frame rates through optical scanning.
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
SCAPE achieves significantly higher volumetric imaging speeds than conventional methods, exceeding 20 volumes per second, and can image spontaneous neuronal firing in awake mice and freely moving Drosophila larvae, providing detailed 3D dynamics with sufficient spatiotemporal resolution to resolve different onset and decay dynamics within a single dendritic branch.
Implementation Method 1
projecting sheets of light into a sample
Implementation Method 2
detecting light emission elicited from the swept light sheets
Data Source
Figure 1A~1B
Figure 1C~1E
Figure 1F
AI summary
The present disclosure is directed to new 3D imaging techniques. For example, in certain embodiments, the instant disclosure is directed to a technique for the volumetric imaging of living samples at ultra-high speeds identified herein as swept, confocally-aligned planar excitation (SCAPE) imaging.