Non-invasive Optical Imaging for Brain Arterial Elasticity
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Solution Overview
Problem
Current methods for studying brain tissue, particularly cerebrovascular health and arterial stiffness, face limitations such as invasiveness, high costs, and inability to provide continuous, non-invasive, portable, and low-cost monitoring, which hinders early detection and prevention of cognitive impairments like Alzheimer's disease.
Innovation Solution
An optical imaging system that illuminates brain blood vessels with non-ionizing NIR light, registers the interaction, and determines a shape parameter of the hemodynamic pulse to generate reports on arterial elasticity, offering non-invasive 2D or volumetric imaging of pulse propagation across the brain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional imaging methods (PET, fMRI, CT) are used to obtain spatial brain maps, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical imaging systems (PET, fMRI, CT) with an optical imaging system that uses light propagation through tissue. This substitution maintains measurement precision for arterial stiffness while dramatically reducing device complexity and cost by using optical detectors and light sources instead of expensive mechanical scanning and radiation equipment
Solution Approach 2:
The patent introduces light as an intermediary to measure arterial stiffness indirectly through optical density changes during pulse propagation. Instead of directly imaging blood vessels with complex equipment, the system uses light absorption and scattering properties of blood to infer vascular health, simplifying the measurement approach while maintaining precision
2Measurement precision
If PET and fMRI are used to provide spatial maps of brain function, then measurement precision is improved, but loss of time increases due to slow data acquisition
Solution Approach 1:
The patent utilizes the periodic nature of arterial pulse waves to drive the measurement process. By synchronizing optical detection with the cardiac cycle and analyzing pulse wave propagation through tissue, the system rapidly captures spatial information about arterial stiffness across the brain, reducing acquisition time while maintaining precision through the repetitive, rhythmic signal
3Measurement precision
If CT is used to obtain brain images, then measurement precision is improved, but object-affected harmful factors increase due to ionizing radiation
Solution Approach 1:
The patent converts the normally harmful effect of light absorption and scattering in tissue into a beneficial measurement mechanism. By detecting optical density changes as light passes through brain tissue during pulse propagation, the system extracts precise information about arterial stiffness without using ionizing radiation, thus eliminating harmful effects while maintaining measurement precision
4Ease of operation
If ultrasound methods are used to study arterial stiffness, then ease of operation is improved, but measurement precision deteriorates due to skull bone interference
Solution Approach 1:
The patent replaces ultrasound mechanical waves with optical waves for measuring arterial stiffness. Since light can more easily penetrate the skull compared to ultrasound, this substitution eliminates the skull bone interference problem while maintaining ease of operation and portability of the imaging system
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 non-invasive, cost-effective, and accurate measurement of arterial elasticity, providing critical information on cerebrovascular health and potential early detection of cognitive impairments, with improved monitoring capabilities compared to traditional methods.
Implementation Method 1
illuminating at least one blood vessel in the brain with light emitted by a light source of an optical imaging system and registering light that has interacted with at least one blood vessel in the brain
Implementation Method 2
registering light that has interacted with at least one blood vessel in the brain with an optical detector
Data Source
AI summary
An optical imaging system and a method for generating a report regarding elasticity of arteries in the brain of a subject under test. Light output from the light source of the imaging system non-invasively illuminates at least one blood vessel or region of interest in the brain and, upon the interaction with the vessel, is registered with an optical detector to obtain a shape parameter of a hemodynamic pulse in the vessel. The shape parameter is further correlated to an elasticity parameter of the blood vessel(s) feeding the brain region of interest and presented in a form of report that may be a two- or a three-dimensional image of the parameter across the tested region of the brain.