Fiber Bragg Grating Sensors for Real-Time Microwave Ablation Zone Prediction
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Solution Overview
Problem
Current microwave ablation treatments face challenges in accurately measuring and visualizing the temperature profile and ablation zone during procedures, as existing imaging modalities struggle to provide real-time monitoring and prediction of the ablation zone's dimensions and shape, especially since standard data sets are not generic across patients or targets.
Innovation Solution
The integration of fiber Bragg gratings in a microwave ablation device for non-contact inferential sensing, allowing real-time temperature measurements and calculations of ablation volume, which are then displayed on a computing device to visualize the progression of the ablation zone in real-time, overlayed onto patient images, and projected to predict the expected ablation zone based on energy application and geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microwave ablation energy is applied to ablate target tissue, then the ablation zone is created and treated, but real-time temperature measurement and visualization of the ablation zone becomes difficult
Solution Approach 1:
The patent introduces fiber optic sensors with Bragg gratings as an intermediary measurement tool that indirectly detects temperature changes in the ablation zone. These sensors convert temperature information into optical signal shifts, allowing non-contact, real-time temperature monitoring without interfering with the microwave ablation process. The fiber optic acts as a mediator between the high-temperature ablation zone and the measurement system.
Solution Approach 2:
The patent replaces traditional mechanical or contact-based temperature measurement methods with optical measurement using fiber Bragg gratings. Instead of using thermocouples or other contact sensors that may interfere with the ablation field, the system uses optical wavelength shifts to detect temperature, substituting a mechanical/electrical measurement approach with an optical one that is more suitable for high-temperature, electromagnetic field environments.
2Loss of information
If existing imaging modalities (ultrasound, CT) are used to monitor ablation zone progression, then imaging capability is provided, but real-time visualization and accurate edge detection of the ablation zone is compromised
Solution Approach 1:
The patent implements a feedback system where fiber optic sensors continuously monitor temperature distribution in the ablation zone and provide real-time data to the control system. This feedback loop allows the system to track the expanding ablation zone boundaries as they form, providing continuous information about the treatment progression rather than relying on intermittent imaging snapshots.
Solution Approach 2:
The patent places fiber optic sensors with Bragg gratings at predetermined positions along the ablation device before the procedure begins. These sensors are pre-positioned to monitor specific regions of interest, allowing the system to anticipate and track the formation of the ablation zone boundary as it expands from the antenna outward.
3Measurement precision
If standard data sets are used to predict final ablation zone characteristics, then prediction capability is provided, but accuracy across different patients and targets is reduced
Solution Approach 1:
The patent transitions from using fixed, standardized prediction data sets to a dynamic measurement system that continuously monitors actual temperature parameters during the procedure. By measuring real-time temperature distribution and using this empirical data to track ablation zone growth, the system adapts to each specific patient's tissue properties and treatment conditions, replacing generic predictions with patient-specific measurements.
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 real-time visualization and prediction of the ablation zone, allowing clinicians to monitor the procedure's progression and adjust accordingly, improving the accuracy and effectiveness of microwave ablation treatments.
Implementation Method 1
a fiber including Bragg gratings formed along a length thereof and configured to reflect light therefrom
Implementation Method 2
calculate temperature measurements based on the reflected light during application of microwave ablation energy
Implementation Method 3
Microwave antennas generate heat in the body to provide hyperthermic temperatures to destroy tissues of interest
Implementation Method 4
Microwave antennas generate heat in the body to provide hyperthermic temperatures
Implementation Method 5
extrapolate the temperature measurements calculated to generate an ablation volume in real time
Data Source
AI summary
An ablation system includes an ablation device configured to ablate a target, and a computing device. The ablation device includes fiber Bragg gratings for monitoring temperature. The computing device is configured to calculate temperature measurements based on light reflected from the fiber Bragg gratings during application of microwave ablation energy to the target and extrapolate the temperature measurements calculated to generate an ablation volume in real time.