Super-Resolution Microvasculature Imaging via Ultrasound Contrast Agents
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Solution Overview
Problem
Traditional ultrasound imaging is diffraction limited, resulting in poor resolution for imaging microvasculature, where vessels as close as 50 microns apart can be blurred into one vessel due to limitations in axial resolution, which is typically around a few hundred microns for clinical systems operating between 2-10 MHz.
Innovation Solution
The method involves administering contrast agent particles into vessels and using dual-frequency ultrasound to detect scattered energy, converting it into an electronic radio frequency signal, and applying an algorithm to determine the spatial location of the particles with finer resolution than the pulse length, allowing for the reconstruction of vessel patterns with improved clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ultrasound imaging is used, then the imaging system can operate at clinical frequencies (2-10 MHz), but the resolution is limited to a few hundred microns due to diffraction limits
Solution Approach 1:
The patent introduces contrast agent particles as intermediaries to enable super-resolution imaging. These particles scatter ultrasound energy and serve as localized markers that can be precisely tracked, allowing resolution beyond the diffraction limit without requiring complex system modifications
Solution Approach 2:
The patent changes the frequency parameter by detecting scattered ultrasound energy at a second frequency range different from the first frequency range. This frequency transformation enables differentiation of contrast agent signals and achieves resolution at least twice as fine as the pulse length
2Measurement precision
If dual-frequency ultrasound detection is used to achieve super-resolution, then imaging resolution improves to at least twice as fine as pulse length, but the device complexity increases
Solution Approach 1:
The ultrasound system is designed to perform multiple functions: transmitting at a first frequency range, detecting scattered energy at a second frequency range, and processing signals to determine spatial locations. This multi-functionality achieves super-resolution without requiring entirely separate imaging systems
3Measurement precision
If contrast agent particles are used to achieve super-resolution imaging, then vessel patterns can be reconstructed with finer detail, but the quantity of substance introduced into the body increases
Solution Approach 1:
The patent uses a minimal concentration of contrast agent particles sufficient for achieving super-resolution imaging. By accumulating detections of individual particles over time, the system reconstructs vessel patterns with high precision without requiring excessive amounts of contrast material
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 achieves resolutions at least twice as fine as the pulse length of the ultrasound pulse, enabling clear imaging of microvasculature, including blood vessels and capillary networks, even when contrast agents are stationary or moving slowly, significantly surpassing the limitations of diffraction-limited ultrasound imaging.
Implementation Method 1
detecting ultrasound energy scattered from the contrast agent particle at a second frequency range that is different from the first frequency range
Implementation Method 2
converting the scattered ultrasound energy into an electronic radio frequency signal
Data Source
AI summary
A method for producing an image of a vessel with ultrasound includes administering a contrast agent particle into the vessel and delivering an ultrasound pulse having a first frequency range to the vessel. The method further includes detecting ultrasound energy scattered from the contrast agent particle at a second frequency range, converting the scattered ultrasound energy into an electronic radio frequency signal, and using an algorithm to determine a spatial location of the contrast agent particle based on extraction of a specific feature of the radio frequency signal. The method further includes generating an image by displaying a marker of the spatial location of the contrast agent particle with a resolution that is finer than a pulse length of the ultrasound pulse and repeating the steps for different contrast agent particles until sufficient markers have been accumulated to reconstruct a pattern of the vessel.