STEAM-DIC Microscopy for High-Speed Stain-Free Cell Imaging
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Solution Overview
Problem
Conventional optical imaging modalities struggle with high-throughput imaging of transparent biological cells due to limited frame rates and the need for chemical staining, which complicates the identification of rare diseased cells amidst healthy cells.
Innovation Solution
The integration of serial time-encoded amplified microscopy (STEAM) with differential interference contrast (DIC) microscopy, utilizing optical spatial dispersers and a Nomarski prism to achieve high-speed, high-contrast imaging without staining, by encoding spatial information into a one-dimensional serial time-domain optical waveform and amplifying the image using amplified dispersive Fourier transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DIC microscopy is used to image transparent cells, then high resolution and high clarity are achieved, but frame rate is limited and real-time monitoring is not possible
Solution Approach 1:
The patent replaces the conventional 2D array image sensor (CCD/CMOS) with a single-pixel photodetector combined with spatial light modulators. This substitution uses optical field modulation and temporal encoding to achieve high-speed imaging, overcoming the inherent speed limitation of conventional sensors while maintaining imaging capability through computational reconstruction.
Solution Approach 2:
The system employs periodic modulation of the optical field using spatial light modulators, encoding spatial information into temporal domains through repeated cyclic measurements. This periodic action enables the single-pixel detector to capture dynamic information at high frame rates by modulating and demodulating the optical signal in time.
2Measurement precision
If chemical staining is used to image transparent cells, then contrast is improved, but sample preparation complexity and potential damage increase
Solution Approach 1:
The patent changes the detection parameter from intensity-based detection (which requires staining) to phase-based detection. By measuring optical path length differences and phase shifts of light passing through cells, the system achieves high contrast imaging of transparent cells without any chemical staining, preserving sample integrity and simplifying preparation.
Solution Approach 2:
The system introduces phase modulation as an intermediary mechanism to convert the invisible optical path length differences of transparent cells into detectable phase signals. Through phase-contrast techniques and interferometric measurement, the phase information is transformed into intensity variations that can be detected, providing contrast without chemical agents.
3Productivity
If conventional cameras are used for high-speed screening, then throughput is limited by shutter speed, but images become blurred during high-speed screening
Solution Approach 1:
The system dynamically modulates the optical field in real-time using spatial light modulators during the measurement process. By adapting the modulation patterns and using temporal encoding, the system can capture high-speed dynamic processes without motion blur, achieving both high throughput and high image quality simultaneously.
Solution Approach 2:
The system performs preliminary encoding of spatial information into temporal domains before detection. By pre-modulating the optical field with known patterns and encoding position information into time delays or phase shifts, the system captures dynamic information in a form that can be reconstructed without blur, even at extremely high speeds beyond conventional shutter capabilities.
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 non-invasive, high-speed, high-contrast imaging of transparent media, suitable for various applications, including blood screening and pathology, with the potential to revolutionize the identification of rare diseased cells, such as Circulating Tumor Cells, by overcoming the limitations of conventional imaging techniques.
Implementation Method 1
The Nomarski prism consists of two birefringent crystal wedges that function to increase the image contrast
Implementation Method 2
Two spatially-dispersed orthogonally-polarized beams are produced such that each wavelength component travels through two adjacent points on the analyzed object with different polarizations
Implementation Method 3
by recombining the two phase-encoded beams using another Nomarski prism (similar to the first one), the differential phase information of every two adjacent points (illuminated by each wavelength component of the illumination beam) of the object is converted into the intensity of that wavelength component
Implementation Method 4
The STEAM approach exploits an amplified space-to-time mapping technique to encode the spatial information of an object into a one-dimensional (1D) serial time-domain optical waveform and optically amplifies the image, simultaneously
Implementation Method 5
The temporal waveform containing the image is then captured by a photodetector and digitized by a conventional electronic digitizer
Data Source
AI summary
We describe methods and apparatus for high-speed high-contrast imaging one-, two- and three-dimensional imaging enabled by differential interference contrast time encoded amplified microscopy of transparent media without the need for chemical staining, that are suitable for a broad range of applications from semiconductor process monitoring to blood screening. Our methods and apparatus build on a unique combination of serial time-encoded amplified microscopy (STEAM) and differential interference contrast (DIC) microscopy. These methods and apparatus are ideally suited for identification of rare diseased cells in a large population of healthy cells and have the potential to revolutionize blood analysis and pathology including identification of cancer cells, such as Circulating Tumor Cells (CTC) in early stage disease.