Light Sheet Microscope with Microlens Array for Multi-Plane Imaging
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Solution Overview
Problem
Light sheet microscopy faces limitations in imaging large samples with good resolution due to the unavoidable correlation between light sheet thickness and depth of focus, leading to unsharp imaging and reduced depth information, especially when trying to maintain high light efficiency.
Innovation Solution
A light sheet microscope with a microlens array integrated between the detection optic and camera allows for simultaneous imaging of multiple object planes around the focal plane, increasing depth information while maintaining light efficiency, using beam homogenization techniques to ensure uniform illumination and high resolution across planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light sheet thickness is reduced to improve image contrast and resolution, then image quality improves, but the depth of focus decreases and only smaller image fields can be viewed with higher resolution
Solution Approach 1:
The detection beam path is segmented into multiple detection paths using beam splitters, with each path equipped with a microlens array to capture light from different object planes simultaneously. This allows the system to maintain a thin light sheet for high resolution while expanding the total image field by dividing and parallel-processing multiple planes.
Solution Approach 2:
The system transitions from detecting a single object plane to simultaneously detecting multiple object planes arranged around the focal plane of the detection optic. By adding the dimension of multiple planes along the detection axis, the system achieves both high resolution (from thin light sheet) and large image field (from multiple planes).
2Area of stationary object
If the depth of focus of the detection optic is increased by stopping down to view larger image fields, then image field size increases, but resolution is lost particularly depth information
Solution Approach 1:
Instead of using a single detection optic with reduced numerical aperture, the system segments the detection into multiple paths, each with its own microlens array optimized for capturing light from a specific object plane. This maintains high numerical aperture and depth resolution for each plane while collectively covering a large image field across multiple planes.
Solution Approach 2:
Microlens arrays are introduced as intermediary optical elements in each detection path to focus light from different object planes onto the camera sensor. These microlens arrays enable high-resolution depth information capture without requiring the main detection optic to have a large depth of focus.
3Loss of information
If sequential scanning is used to image large volumes, then complete volume information is obtained, but imaging speed decreases and sample stress increases
Solution Approach 1:
Multiple detection paths with microlens arrays are merged to simultaneously capture images of multiple object planes in a single shot. This combines the information from what would otherwise require sequential scanning, achieving complete volume information at high speed without repeated illumination of the sample.
Solution Approach 2:
The system enables continuous, simultaneous imaging of multiple planes without the interruptions inherent in sequential scanning. By maintaining continuous illumination and simultaneous detection across multiple planes, the system achieves high imaging speed while minimizing sample stress from repeated exposure cycles.
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
This approach enables high-resolution, simultaneous imaging of large volumes with increased speed and depth information, suitable for dynamic processes, by coordinating light sheet thickness with the detection optic's depth of focus, avoiding sequential scanning and reducing sample stress.
Implementation Method 1
a microlens array which is integrated into the camera or arranged in the beam path in front of the camera
Implementation Method 2
As a result of diffraction, an unavoidable correlation exists between the thickness of the light sheet and its depth of focus
Data Source
AI summary
A light sheet microscope for simultaneous imaging of several object planes illuminated by a light sheet includes a camera and a detection optic defining a detection light beam between the light sheet and the camera. The object planes are arranged around the focal plane of the detection optic. The detection optic can include a microlens array.