Phase diversity-based wavefront sensing for fluorescence microscopy
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Solution Overview
Problem
Fluorescence microscopy is compromised by optical aberrations caused by refractile samples and imperfect optical components, leading to degraded image contrast, resolution, and signal, which existing adaptive optics methods are complex, inefficient, and costly to implement.
Innovation Solution
A microscope system that introduces known aberrations into sample images using a wavefront modulating element, such as a deformable mirror, and estimates and corrects wavefront aberrations using phase diversity techniques, enabling rapid and accurate aberration reduction without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adaptive optics methods are used to sense and cancel aberrated wavefront, then image quality is improved, but system complexity increases
Solution Approach 1:
The patent combines wavefront sensing and correction into a unified phase diversity approach that uses the same imaging optics for both purposes. The wavefront modulating element is integrated into the existing optical path without requiring separate sensing optics, merging the sensing and correction functions into a single system that operates through coordinated phase modulation and computational processing.
Solution Approach 2:
The patent replaces complex mechanical wavefront sensing hardware with a computational approach. Instead of using traditional Shack-Hartmann sensors or other mechanical wavefront sensing devices, the system uses phase diversity imaging combined with computational algorithms to sense and correct wavefront aberrations, substituting mechanical complexity with computational processing.
2Measurement precision
If adaptive optics methods are used to correct wavefront aberrations, then image resolution is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary phase modulation to the wavefront before imaging. By introducing known phase diversities through the wavefront modulating element prior to image acquisition, the system prepares the wavefront in advance, enabling faster computational processing during the sensing phase and reducing overall processing time while maintaining high resolution correction.
3Reliability
If traditional adaptive optics hardware is added to correct aberrations, then imaging performance is improved, but system cost increases
Solution Approach 1:
The patent makes the wavefront modulating element serve multiple functions: it acts as both an illumination modulator and a wavefront corrector within the same optical system. This multi-functional approach eliminates the need for separate expensive adaptive optics hardware, reducing system cost while maintaining imaging performance through the dual-use of the modulating element.
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
Achieves diffraction-limited imaging with less than λ/35 RMS error using few measurements, allowing real-time aberration correction and improving image quality without complex setup or high costs.
Implementation Method 1
A wavefront modulating element is configured for modifying a wavefront of the light received from the sample to reduce aberrations of light emitted from the sample
Implementation Method 2
a deformable mirror having multiple electro-mechanical actuators, each actuator being configured to locally deform a portion of a surface of the deformable mirror
Data Source
AI summary
A light beam is imaged within a sample and images of the sample are generated based on light received from the sample in response to the light imaged within the sample. A wavefront modulating element modifies a wavefront of the received light and/or a wavefront of the light imaged within the sample. One or more known aberrations are introduced into at least one image of the sample and, based on at least two images of the sample, where the images include a raw image and at least one image that includes a known aberration, an aberration of a wavefront of light emitted from, and/or provided to, the sample is estimated. The wavefront modulating element is controlled to modulate the wavefront of light emitted from, and/or provided to, the sample, such that the estimated aberration of the wavefront of light emitted from, and/or provided to, the sample is reduced.