MRI-Based RF Exposure Evaluation Using Tissue-Mimicking Phantoms
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Solution Overview
Problem
Current methods for evaluating the safety risk of radio frequency (RF) emitting devices, such as mobile phones, are limited by simulation-based approaches that may not accurately reflect real-world exposure conditions, and the use of simplistic gel phantoms fails to account for the complex anatomy of the human brain, leading to potential underestimation of thermal and non-thermal effects.
Innovation Solution
The use of magnetic resonance imaging (MRI) systems to assess the internal temperature and non-thermal reactions in subjects exposed to RF emitting devices, employing referenceless magnetic resonance thermometry and functional MRI to provide more accurate, subject-specific measurements of RF power deposition and physiological changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If simulation-based methods (FDTD) are used to evaluate RF exposure safety, then evaluation can be conducted with different orientations relative to an average human model, but the actual induced fields inside the subject may differ from simulated fields, leading to reduced measurement precision
Solution Approach 1:
The patent creates a physical copy (tissue-mimicking phantom) of human brain anatomy that replicates the dielectric properties and structural complexity of real brain tissue. This phantom serves as a realistic model for RF exposure evaluation, allowing multiple device orientations to be tested while obtaining accurate measurements of actual induced fields, thereby resolving the discrepancy between simulation and reality.
Solution Approach 2:
The patent changes the physical parameters of the evaluation system by transitioning from virtual simulation parameters to physical measurement parameters. The tissue-mimicking phantom is designed with specific dielectric properties (permittivity, conductivity) that match human brain tissue, enabling accurate measurement of RF field interactions across different frequencies and orientations.
2Ease of manufacture
If homogeneous gel phantoms are used to mimic human brain anatomy, then the setup is simple, but the complex anatomy of the human brain is not accounted for, leading to potential underestimation of thermal and non-thermal effects
Solution Approach 1:
The patent employs composite materials in the tissue-mimicking phantom, combining substances with specific dielectric properties to replicate the complex electromagnetic characteristics of human brain tissue. The composite structure includes multiple regions with varying permittivity and conductivity values, accurately representing different brain tissues (gray matter, white matter, cerebrospinal fluid) while maintaining a manageable phantom design.
Solution Approach 2:
The phantom incorporates local variations in dielectric properties to represent different anatomical regions of the brain. Each region is tailored with specific electromagnetic characteristics matching the corresponding brain tissue, allowing accurate assessment of localized thermal and non-thermal effects that homogeneous phantoms cannot capture.
3Measurement precision
If temperature probes are implanted in gel phantoms to measure temperature change, then temperature correlation with tissue damage can be recorded, but the homogeneous gel phantom fails to represent the complex anatomy, making conclusions misleading
Solution Approach 1:
The tissue-mimicking phantom creates a realistic copy of human brain anatomy with appropriate dielectric properties, allowing temperature probes to measure thermal effects in a structurally and electromagnetically accurate model. This ensures that temperature measurements reflect actual brain tissue responses to RF exposure, making safety conclusions reliable.
Solution Approach 2:
The patent changes the material parameters of the phantom from homogeneous gel to tissue-mimicking composite with spatially varying dielectric properties. This transformation enables the phantom to accurately represent the complex interaction between RF fields and brain anatomy, ensuring that temperature measurements and derived safety conclusions are valid.
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 allows for a more precise evaluation of thermal and non-thermal effects on the human body, overcoming the limitations of simulation-based methods and providing a more accurate assessment of RF exposure risks, enabling safer usage guidelines for RF transmitting devices.
Implementation Method 1
employing referenceless magnetic resonance thermometry and functional MRI to provide more accurate, subject-specific measurements of RF power deposition and physiological changes
Implementation Method 2
Being exposed to the RF radiation can result in increased heating of tissue via Joule and Dielectric heating mechanisms
Implementation Method 3
Being exposed to the RF radiation can result in increased heating of tissue via Joule and Dielectric heating mechanisms
Data Source
AI summary
Exemplary system, method and computer accessible medium can be provided for evaluating at least one radio frequency transmitting arrangement. For example, it is possible to receive a first information associated with at least one scan of at least one live subject corresponding to one or more effects of the transmitting arrangement(s) on the at least one live subject, and determine a second information based on the first information.