Projection Microscopy with Wavefront Modulation for High-Rate Imaging
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Solution Overview
Problem
Existing multiphoton imaging techniques face limitations in achieving high frame rates and pixel counts due to crosstalk from fluorescence lifetime and scanning inefficiencies, particularly in scattering samples, which degrades image resolution and requires inefficient sampling techniques.
Innovation Solution
A method combining a mechanical scanner with a wavefront modulating element, such as a DMD, to modulate the amplitude and phase of an extended focus of excitation light, allowing for rapid scanning and programmable spatial patterns within the focal plane, enabling high frame rates and high spatial resolution imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If raster scanning is used to image the sample, then spatial resolution is maintained, but frame rate is limited to approximately 100 Hz
Solution Approach 1:
The patent segments the excitation light into multiple spatial regions using a wavefront modulating element (DMD), allowing simultaneous illumination of multiple sample locations. This divides the imaging task into parallel segments that can be processed concurrently, dramatically increasing frame rate while maintaining spatial resolution through controlled modulation of each segment.
Solution Approach 2:
The patent transitions from one-dimensional point-by-point raster scanning to two-dimensional parallel illumination patterns. By using the DMD to create spatially modulated excitation patterns across the entire field of view simultaneously, the system adds a spatial dimension to the excitation approach, enabling thousands of pixels to be imaged in parallel rather than sequentially.
2Measurement precision
If more pixels are sampled per frame, then spatial resolution is improved, but frame rate decreases due to crosstalk from fluorescence lifetime
Solution Approach 1:
The patent applies preliminary spatial modulation of the excitation light using the wavefront modulating element before the light reaches the sample. By pre-patterning the excitation regions according to the desired measurement grid, the system ensures that only designated spatial locations are excited at each moment, preventing crosstalk from adjacent pixels while maintaining high spatial resolution and enabling rapid frame rates.
Solution Approach 2:
The patent dynamically changes the spatial distribution parameters of the excitation light by programming different patterns on the DMD for each time point. This allows precise control over which pixels are excited simultaneously, optimizing the balance between spatial resolution (number of pixels sampled) and frame rate (how quickly patterns can be changed), while the fast scanning ensures pattern changes occur faster than fluorescence lifetimes.
3Loss of time
If random access imaging with acousto-optic deflectors is used, then scanning time is reduced for sparse points, but access time is required to move focus between points
Solution Approach 1:
The patent replaces mechanical or acousto-optic deflection systems with a wavefront modulating element (DMD) that uses electronic control to redirect light. Instead of physically moving mirrors or using acoustic waves to deflect the beam, the DMD electronically patterns the excitation light, eliminating the need for access time to move the focus between points and dramatically reducing scanning time for both sparse and dense point sets.
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
The technique achieves frame rates exceeding 1000 Hz for fields of view greater than 1 million pixels, providing high spatial resolution and insensitivity to scattering, while allowing for dynamic activity recovery and particle localization below the resolution limit.
Implementation Method 1
Biological samples are often opaque, meaning that optical tools for studying intact tissues at high resolution must be insensitive to light absorption and scattering
Implementation Method 2
detecting light emitted from the sample in response to excitation by the modulated light
Data Source
AI summary
A method of imaging a sample providing light from a light source, directing the provided light into an extended focus, scanning the extended focus across a wavefront modulating element that modulates amplitudes of the light along the extended focus, providing the modulated light to the sample, detecting light emitted from the sample in response to excitation by the modulated light, and generating an image of the sample based on the detected fluorescence emission light.