Nested RF Waveguide Probe for Stronger Thermoacoustic Signals
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Solution Overview
Problem
Thermoacoustic probes with a side-by-side configuration for RF applicator and acoustic receiver suffer from inefficient energy transfer, reduced signal strength, RF interference, and spurious acoustic signals, leading to poor image quality and increased variability in thermoacoustic measurements.
Innovation Solution
A thermoacoustic measurement probe design featuring an open-ended hollow RF waveguide that surrounds and is mechanically joined to a thermoacoustic transducer, allowing for improved overlap between RF energy and acoustic receiver directivity patterns, reduced RF interference, and adjustable polarization of RF energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RF applicator and acoustic receiver are configured side-by-side, then device integration is achieved, but signal strength is reduced and RF interference increases
Solution Approach 1:
The acoustic receiver is positioned inside the hollow cavity of the RF waveguide, creating a nested configuration where the receiver is surrounded by the RF energy distribution structure. This nesting enables the acoustic receiver to be fully immersed in the RF energy field while being mechanically supported by the waveguide structure, thereby maximizing overlap between RF energy and acoustic reception without RF interference
Solution Approach 2:
The hollow cavity of the RF waveguide serves as an intermediary structure that distributes RF energy uniformly throughout the cavity space while providing mechanical support and positioning for the acoustic receiver. This intermediary structure enables efficient energy transfer from the RF applicator to the tissue medium while the acoustic receiver detects thermoacoustic signals generated within the same cavity volume
2Device complexity
If RF applicator and acoustic receiver are configured side-by-side, then device integration is achieved, but RF interference adversely affects signal quality
Solution Approach 1:
The acoustic receiver is positioned inside the hollow cavity of the RF waveguide, creating a nested configuration where the receiver is surrounded by the RF energy distribution structure. This nesting enables the acoustic receiver to be fully immersed in the RF energy field while being mechanically supported by the waveguide structure, thereby maximizing overlap between RF energy and acoustic reception without RF interference
Solution Approach 2:
The acoustic receiver is extracted from the traditional side-by-side position and placed inside the RF waveguide cavity, separating the RF energy transmission function (performed by the waveguide) from the acoustic detection function (performed by the receiver inside the cavity). This spatial separation eliminates RF interference while maintaining integration
3Device complexity
If RF applicator and acoustic receiver are configured side-by-side, then device integration is achieved, but energy transfer efficiency is reduced
Solution Approach 1:
The acoustic receiver is positioned inside the hollow cavity of the RF waveguide, creating a nested configuration where the receiver is surrounded by the RF energy distribution structure. This nesting enables the acoustic receiver to be fully immersed in the RF energy field while being mechanically supported by the waveguide structure, thereby maximizing overlap between RF energy and acoustic reception without RF interference
Solution Approach 2:
The acoustic receiver is positioned in three-dimensional space within the hollow cavity of the RF waveguide, allowing it to intercept RF energy from multiple directions simultaneously. This spatial arrangement in another dimension enables comprehensive coverage of the RF energy distribution pattern, maximizing energy transfer efficiency from all directions
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 configuration enhances signal strength, reduces RF interference, and allows for precise control of polarization, resulting in improved image quality and reduced variability in thermoacoustic measurements.
Implementation Method 1
Thermoacoustic imaging uses short pulses of electromagnetic energy, such as RF pulses, directed into a medium to heat absorbing features within the medium rapidly, which in turn induces acoustic pressure waves
Implementation Method 2
it is common to employ waveguides to guide electromagnetic waves or sound with minimal loss of energy by restricting expansion of the electromagnetic waves propagating within the waveguides to one or two dimensions
Implementation Method 3
acoustic pressure waves that are detected using acoustic receivers such as one or more thermoacoustic or ultrasound transducer arrays
Data Source
AI summary
A thermoacoustic measurement probe includes an open-ended hollow radio-frequency (RF) waveguide; at least two RF feeds positioned within the open-ended hollow RF waveguide, wherein each RF feed is configured to provide RF energy; and a thermoacoustic transducer, wherein the open-ended hollow RF waveguide, in the form of a sleeve, surrounds and is mechanically joined to the thermoacoustic transducer.