Bubble-Induced Color Doppler Feedback for Histotripsy
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Solution Overview
Problem
Current imaging feedback methods for Histotripsy, such as speckle amplitude reduction, are inadequate for real-time monitoring of tissue fractionation due to their low sensitivity and inability to distinguish between complete tissue death and fractionation levels, and require processing times that are not synchronized with the high pulse frequency of Histotripsy therapy.
Innovation Solution
A system utilizing bubble-induced color Doppler imaging that synchronizes ultrasound imaging pulses with Histotripsy pulses to monitor tissue fractionation in real-time, using specific Doppler parameters to track tissue displacement and differentiate between microscopic cellular damage and macroscopic tissue structural damage, allowing for real-time feedback during treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging feedback methods (e.g., speckle amplitude reduction) are used to monitor Histotripsy treatment, then the system can provide imaging feedback, but the sensitivity is insufficient to distinguish between complete tissue death and fractionation levels
Solution Approach 1:
The patent changes the imaging parameter from conventional B-mode ultrasound to color Doppler imaging, which detects blood flow velocity changes. This parameter change enables the system to distinguish between different tissue damage levels (microscopic cellular damage vs. macroscopic tissue structural damage) by monitoring the characteristic flow patterns in fractionated tissue, thereby improving measurement precision and reducing information loss.
2Productivity
If conventional imaging feedback methods are used, then imaging can be performed, but the processing time is too long to synchronize with high pulse frequency Histotripsy therapy
Solution Approach 1:
The patent extracts only the essential information needed for treatment monitoring by using color Doppler imaging to detect characteristic blood flow patterns in fractionated tissue. This extraction approach focuses on specific physiological changes (flow velocity and direction) rather than processing complete high-resolution images, thereby reducing processing time and enabling synchronization with high pulse frequency Histotripsy therapy while maintaining real-time monitoring capability.
3Measurement precision
If MRI thermometry is used to monitor HIFU treatment, then temperature monitoring is achieved, but the system requires expensive open magnet MRI equipment that is not clinically available
Solution Approach 1:
The patent replaces the complex mechanical MRI system with a simpler ultrasound-based color Doppler imaging system. Instead of using MRI thermometry to measure temperature changes, the invention uses ultrasound to detect blood flow velocity and direction changes in the treated tissue. This substitution maintains treatment monitoring accuracy by providing real-time feedback on tissue fractionation status while eliminating the need for expensive and complex open magnet MRI equipment, making the system clinically available.
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
The system provides improved sensitivity for monitoring tissue fractionation, enabling real-time detection of treatment completion and distinguishing between cellular damage and tissue homogenization, thus enhancing treatment efficiency and accuracy.
Implementation Method 1
an ultrasound Doppler imaging system configured to transmit ultrasound imaging pulses along the propagation direction of the Histotripsy pulses and generate color Doppler imaging of the tissue from the transmitted ultrasound imaging pulses
Implementation Method 2
Histotripsy is a new non-invasive and non-thermal ultrasound ablation technology. It uses high intensity, microsecond-long ultrasound pulses to control cavitating bubble clouds for tissue fractionation
Data Source
AI summary
A Histotripsy therapy system is provided that can include any number of features. In some embodiments, the system includes a high voltage power supply, a pulse generator electrically coupled to at least one signal switching amplifier, at least one matching network electrically coupled to the signal switching amplifier(s), and an ultrasound transducer having at least one transducer element. The Histotripsy therapy system can further include an ultrasound Doppler imaging system. The Doppler imaging system and the Histotripsy therapy system can be synchronized to enable color Doppler acquisition of the fractionation of tissue during Histotripsy therapy. Methods of use are also described.