Dielectric-Loaded RF Antennas for Deep Tissue Thermoacoustic Imaging
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Solution Overview
Problem
Conventional thermoacoustic and ultrasound tomography systems are primarily limited to imaging extremities such as the breast or limbs, and there is a need for technologies that can effectively image deeper regions of the human body to provide comprehensive medical imaging.
Innovation Solution
A system incorporating radio frequency (RF) sources, dielectric-loaded RF antennas, and ultrasonic sensors that interleave thermoacoustic and ultrasonic signals to enable deep tissue imaging, utilizing dielectric materials to match tissue permittivity and gas-filled spacers to block acoustic waves, allowing for co-registration of thermoacoustic and ultrasonic image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional TAT systems use single or eight waveguide antennas with deionized water coupling, then extremity imaging (breast, limbs) is achieved, but whole-body imaging capability is limited
Solution Approach 1:
The system divides the body into multiple imaging regions, using different antenna configurations for different body parts. Extremities are imaged using conventional waveguide antennas, while the torso is imaged using dielectric-loaded antennas, allowing comprehensive coverage without requiring a single complex system configuration
Solution Approach 2:
The dielectric-loaded RF antennas serve multiple functions: they provide efficient RF energy coupling for deep tissue imaging, enable whole-body imaging capability, and can be used in conjunction with conventional waveguide antennas for different body regions, making the system versatile for various imaging applications
2Length of stationary object
If dielectric-loaded RF antennas are used to enable deep tissue imaging, then imaging depth is improved, but device complexity increases
Solution Approach 1:
A dielectric material is introduced as an intermediary between the RF antenna and the body for deep tissue imaging. This dielectric loading improves RF energy coupling and enables deeper penetration into the torso while maintaining manageable antenna structure complexity
Solution Approach 2:
The antenna design is modified by changing the dielectric properties of the loading material to optimize RF energy distribution and penetration depth. By adjusting dielectric constants and loss tangents, the system achieves deeper imaging capability without proportionally increasing structural complexity
3Power
If RF pulses are transmitted at high power to achieve adequate signal penetration, then imaging capability is improved, but tissue heating risk increases
Solution Approach 1:
The system uses dielectric materials with optimized loss tangent parameters to improve RF energy absorption efficiency in the tissue. This allows achieving adequate signal penetration at lower transmitted power levels, reducing the risk of tissue heating while maintaining imaging capability
Solution Approach 2:
The dielectric loading is applied locally at the antenna interface rather than throughout the entire body, concentrating the RF energy where it is most needed for deep tissue penetration while minimizing overall energy deposition and associated heating risks
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 the diagnosis and evaluation of health conditions by providing mm-scale resolution and rich contrast of biological structures within the body, extending imaging capabilities beyond extremities to whole-body imaging.
Implementation Method 1
Modulated radio frequency signals are irradiated into tissues, leading to absorption-specific thermoelastic expansion released as thermoacoustic waves
Implementation Method 2
utilizing dielectric materials to match tissue permittivity
Implementation Method 3
gas-filled spacers to block acoustic waves
Data Source
AI summary
Certain aspects pertain to systems, apparatus, and methods for one or both of thermoacoustic and ultrasound tomography.