Dynamic Light Sheet Illumination for SPIM Resolution-Field of View Trade-off
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Solution Overview
Problem
Current selective plane illumination microscopy (SPIM) technologies face limitations in achieving high axial resolution while maintaining a large field of view, as the axial resolution increases linearly with numerical aperture (NA), but the field of view decreases with the square of the NA, making it challenging to combine high axial resolution with a large field of view.
Innovation Solution
The implementation of optical arrangements that dynamically vary the cross-section, position, and direction of the light sheet illumination, along with the use of variable focus lenses to adjust the focal distance, allows for the generation of a thinnest possible light sheet over the largest possible field of view, enabling high spatial and temporal resolution without mechanical vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the numerical aperture (NA) of the illumination objective is increased to improve axial resolution, then the axial resolution is improved, but the field of view decreases with the square of the NA
Solution Approach 1:
The patent employs dynamic control of the light sheet parameters through variable focus lenses and scanning mechanisms. The illumination system can dynamically adjust the light sheet thickness and position to maintain optimal axial resolution across different field positions, rather than using a fixed NA configuration. This allows the system to adapt the illumination parameters in real-time to balance resolution and field of view requirements.
Solution Approach 2:
The system changes the illumination parameters (light sheet thickness, numerical aperture, focal distance) dynamically during operation. By using variable focus lenses and adjusting the illumination objective parameters, the system can optimize the light sheet characteristics for different regions of the specimen, achieving high axial resolution where needed while maintaining a larger overall field of view.
2Measurement precision
If a thin light sheet is used to achieve high axial resolution, then the axial resolution is improved, but the field of view decreases
Solution Approach 1:
The patent implements dynamic adjustment of the light sheet thickness through variable focus lenses and scanning mechanisms. The system can change the light sheet parameters in real-time to maintain thin illumination for high axial resolution while scanning across a larger field of view, rather than being constrained by a fixed thin light sheet geometry.
Solution Approach 2:
The system addresses the field of view limitation by introducing temporal dimension through scanning. Instead of attempting to illuminate the entire large field of view with a single thin light sheet simultaneously, the system scans the thin light sheet across the field of view over time, achieving both high axial resolution and large field of view coverage through sequential illumination of different regions.
3Measurement precision
If the light sheet is made thinner to improve axial resolution, then the axial resolution increases linearly, but the field of view decreases with the square of the improvement
Solution Approach 1:
The patent employs dynamic control mechanisms including variable focus lenses and scanning systems that allow the light sheet parameters to be adjusted in real-time. This enables the system to maintain thin light sheet illumination for high axial resolution while compensating for the reduced field of view through dynamic repositioning and parameter adjustment during the imaging process.
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 enhances the axial resolution and field of view in SPIM, providing optimal spatial and temporal resolution for 3D imaging of specimens, addressing the limitations of traditional SPIM systems and enabling dynamic imaging of rapid biophysical processes without perturbing the specimen.
Implementation Method 1
illuminating of a specimen in thin optical slices, formed from laser light
Implementation Method 2
the direction in which the light is detected is typically perpendicular to the illuminated plane
Implementation Method 3
acquiring light emitted by the illuminated plane inside the specimen
Implementation Method 4
The resolution of SPIM is often limited by the shape and properties of the light sheet illuminating the specimen
Data Source
AI summary
A system for illuminating a microscopy specimen includes an illumination source configured to emit a light that travels along an illumination path to illuminate the microscopy specimen placed on an optical detection path of an optical microscope. The system also includes optical elements in the illumination path and configured to at least in part transform the light from the illumination source into a light sheet illuminating the microscopy specimen. The optical elements include an electronically tunable lens configured to vary a focal distance of the electronically tunable lens to dynamically vary a position of a waist of the light sheet illuminating the microscopy specimen. The optical elements include a deflector configured to vertically move the light sheet to illuminate the microscopy specimen at different horizontal planes.