Common-Path Coherent Optical Imaging for Neural Tissue
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Solution Overview
Problem
Conventional coherent optical imaging techniques are limited by stringent phase matching conditions that restrict the number of object photons that can be used for imaging, leading to reduced imaging quality due to the exclusion of diffuse photons that do not meet angular requirements.
Innovation Solution
The implementation of a common path technique where both the reference and object beams are exposed to the target medium, allowing for a common path interference beam to be formed, which reduces relative phase errors and increases the number of usable photons by routing both beams through the same path, thereby enhancing imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional local-oscillator coherent optical imaging techniques are used with stringent phase matching conditions, then ballistic photons can be effectively utilized, but the number of usable object photons is significantly limited due to restrictive angular offset requirements
Solution Approach 1:
The patent changes the angular parameter requirements by using a common-path configuration where the reference beam and object beam traverse the same physical path through the medium. This eliminates the restrictive angular offset conditions of conventional techniques, allowing photons over a much broader angular range to contribute to the interferometric signal, thereby increasing the number of usable photons while maintaining imaging quality
Solution Approach 2:
The patent introduces a common-path interferometric configuration as an intermediary approach between conventional local-oscillator methods and diffuse correlation techniques. This common-path setup acts as a mediator that allows both ballistic and diffuse photons to be utilized by establishing interference between reference and object beams that have experienced identical scattering conditions, thus expanding the usable photon population
2Reliability
If a common path technique is used to increase the number of usable photons, then the signal-to-noise ratio and penetration depth are improved, but the system complexity increases due to the need for precise beam routing and path matching
Solution Approach 1:
The patent merges the reference beam path and object beam path into a single common path through the medium. By combining these paths, the system eliminates the need for separate routing channels and complex alignment mechanisms required in conventional interferometric setups, thereby reducing system complexity while maintaining the ability to generate high-quality interferometric signals with improved signal-to-noise ratio
Solution Approach 2:
The common-path configuration enables the system to self-align and self-compensate for environmental disturbances. Since both beams experience the same physical path, any perturbations affect both beams equally and are automatically compensated in the interferometric measurement, eliminating the need for complex active stabilization systems and reducing overall system complexity
3Manufacturing precision
If conventional techniques with fixed reference beams are used, then the angular requirements are well-defined, but the penetration depth and spatial resolution are limited due to the small angular offset requirement
Solution Approach 1:
The patent transitions from a static, fixed reference beam configuration to a dynamic common-path configuration where both reference and object beams are continuously coupled and experience the same evolving optical conditions. This dynamic approach allows the system to adapt to varying scattering conditions in real-time, enabling both improved spatial resolution and increased penetration depth by utilizing photons across a broad angular spectrum
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 increases the number of photons meeting angular requirements, improving signal-to-noise ratio and allowing for higher spatial resolution and penetration depth in imaging applications, particularly in highly scattering environments like neural tissue imaging.
Implementation Method 1
The beam combiner is positioned to receive the reference beam and the object beam, combine the reference beam and the object beam to form a combined beam
Implementation Method 2
Coherent optical imaging techniques that analyze the interaction of waves (e.g., light waves) using principles of interferometry
Data Source
AI summary
Example apparatuses and methods relating to imaging systems are provided. An example imaging system may include an optical source configured to generate an optical beam, a beam splitter configured to split the optical beam into a reference beam and an object beam, and a beam combiner configured to route a combined beam with reference beam and object beam components along a common path into a target medium. In this regard, the target medium may act upon the combined beam to form a common path interference beam. The example imaging system may further include an imaging sensor configured to receive the common path interference beam and generate common path interference beam data associated with the common path interference beam, and an image data processor configured to analyze the common path interference beam data to generate image data describing the target medium.