Ultrasound-Switchable Fluorophores for High Specificity Tissue Imaging
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Solution Overview
Problem
Current imaging technologies face challenges in achieving high specificity for biomedical imaging due to the inability to effectively differentiate between specifically bound and unbound contrast agents in vivo, leading to limited accuracy and time-consuming processes.
Innovation Solution
The use of ultrasound-switchable fluorophores, which can be activated to differentiate between bound and unbound contrast agents through exposure to ultrasound and electromagnetic radiation, allowing for precise imaging by determining the photoluminescence properties of targeting and non-targeting fluorophores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging methods are used to wait for unbound contrast agents to wash out, then imaging can be performed, but specificity is limited due to remaining unbound agents and non-specific binding
Solution Approach 1:
The patent segments the imaging process into distinct phases: first activating only targeting fluorophores bound to bio-targets, then activating non-targeting fluorophores. This temporal segmentation allows differentiation between bound and unbound agents by comparing signals from the two activation phases, thereby improving imaging specificity and accuracy.
Solution Approach 2:
The patent employs periodic activation of different fluorophore populations through repeated ultrasound exposure cycles. By alternating between activating targeting fluorophores and non-targeting fluorophores in periodic fashion, the system can distinguish specific binding signals from background noise, enhancing measurement precision.
2Measurement precision
If longer wait time is used to allow unbound agents to wash out, then specificity may improve, but bound agents may become detached or degraded resulting in false negatives
Solution Approach 1:
The patent performs preliminary activation of targeting fluorophores bound to bio-targets before activating non-targeting fluorophores. This preliminary action allows the system to capture the specific binding signal while unbound agents are still present, eliminating the need for prolonged waiting periods and preventing bound agent detachment or degradation.
Solution Approach 2:
The patent dynamically adjusts the activation sequence based on the binding kinetics of the contrast agents. By optimizing the timing between activating targeting and non-targeting fluorophores, the system adapts to different washout rates and binding strengths, improving both specificity and reducing imaging time.
3Productivity
If conventional methods are used without differentiation capability, then the process is simpler, but it is time-consuming in longitudinal studies
Solution Approach 1:
The patent introduces non-targeting fluorophores as intermediary reference signals. These fluorophores provide a baseline measurement of unbound agent distribution, which serves as a reference for distinguishing specific binding signals. This intermediary approach enables rapid differentiation without requiring complex additional hardware beyond standard ultrasound and optical detection systems.
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 method enhances imaging specificity by accurately distinguishing between bound and unbound agents, improving the accuracy of bio-target identification and reducing the time required for imaging processes.
Implementation Method 1
ultrasound-switchable fluorophores (USFs), which switch from an off state to an on state upon exposure to ultrasound
Implementation Method 2
detecting a first photoluminescence signal emitted by the population of first targeting fluorophores, and a second photoluminescence signal emitted by the population of second non-targeting fluorophores
Data Source
AI summary
A method of imaging comprises disposing a population of first targeting ultrasound-switchable fluorophores and a population of second non-targeting ultrasound-switchable fluorophores in an environment; detecting a first photoluminescence signal emitted by the population of first targeting fluorophores, and a second photoluminescence signal emitted by the population of second non-targeting fluorophores; determining a photoluminescence property of the population of second non-targeting fluorophores from the second photoluminescence signal; and using the determined photoluminescence property of the population of second non-targeting fluorophores to deconvolute the first photoluminescence signal into the population of first targeting fluorophores bound and unbound to a first target binding element in the environment.