Label-Free Raman Imaging Beyond Microscopic Scales
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Solution Overview
Problem
Conventional Raman scattering-based techniques are limited to microscopic scales due to high autofluorescence background and require labeling, which is not suitable for mesoscopic or macroscopic applications, especially in biological tissues.
Innovation Solution
An imaging system using illumination light with a wavelength of at least 810nm and a detector capable of detecting light in the range of 950nm to 2500nm, allowing for Raman imaging on a mesoscopic or macroscopic scale without labeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional Raman scattering-based techniques are used, then molecular identification is achieved, but the imaging is limited to microscopic scales due to high autofluorescence background
Solution Approach 1:
The patent changes the illumination wavelength parameter from conventional visible/near-infrared ranges to specifically at least 810nm (extending to 2000nm or beyond). This parameter change exploits the fact that autofluorescence background decreases at longer wavelengths, allowing Raman scattering to become distinguishable from background at macroscopic scales without requiring labeling
2Measurement precision
If labeling techniques are used for molecular identification, then detection sensitivity is improved, but the object may be damaged or altered
Solution Approach 1:
The patent enables the object to serve itself by detecting its own intrinsic Raman scattering signal without requiring external labels or stains. The endogenous chemical contrast from the object's own molecular bonds provides the necessary detection sensitivity, eliminating the need for labeling procedures that could damage or alter the object
3Area of stationary object
If wide-field Raman imaging is attempted, then macroscopic imaging is achieved, but the Raman signal is drowned out by elevated autofluorescence background
Solution Approach 1:
The patent changes the wavelength parameter to at least 810nm (extending to 2000nm or beyond), which simultaneously achieves wide-field illumination and improves signal-to-noise ratio. At these longer wavelengths, autofluorescence background is significantly reduced while Raman scattering remains detectable, enabling macroscopic imaging with sufficient chemical contrast
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
Enables label-free imaging of biological tissues and objects at mesoscopic or macroscopic scales with improved Raman-to-autofluorescence contrast, overcoming the limitations of conventional Raman microscopy.
Implementation Method 1
an illumination light source configured to illuminate an area of the object; wherein light emitted by the illumination light source has a wavelength of at least 810nm
Implementation Method 2
a detector configured to detect an image based on Raman scattered light from the object
Implementation Method 3
Raman scattering-based techniques are based entirely on the endogenous chemical contrast without the need for labelling techniques... This method is based on detecting light from Raman scattering, an inelastic scattering process in which energy is exchanged between incident photons and the scattering object
Data Source
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AI summary
Provided is an imaging system for imaging an object, the imaging system comprising: an illumination light source configured to illuminate an area of the object; and a detector configured to detect an image based on Raman scattered light from the object, wherein light emitted by the illumination light source has a wavelength of at least 810nm. Further provided is a method for imaging an object, the method comprising the steps of illuminating an area of the object using illumination light; and detecting an image based on Raman scattered light from the object, wherein the illumination light has a wavelength of at least 810nm.