Reflection Autofocusing Ultrasound Transducer Calibration
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Solution Overview
Problem
Existing ultrasound focusing technologies face challenges in achieving high-quality focal zones due to transducer geometric errors and beam aberrations caused by intervening tissues, particularly in applications like tumor ablation, where inaccuracies can lead to ineffective treatment and damage to non-target tissue.
Innovation Solution
The system employs an acoustic reflector, such as microbubbles, to analyze reflection signals and adjust ultrasound parameter values for transducer elements, using a physical model or machine learning to predict and correct parameter values for elements receiving low-quality signals, thereby improving focusing properties across multiple target regions without the need for individual echo-signal measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional ultrasound focusing methods are used, then the system is simple to operate, but the focusing precision deteriorates due to transducer geometric errors and tissue-induced beam aberrations
Solution Approach 1:
The system transmits ultrasound waves and measures reflections from the target region to obtain actual phase and amplitude information. This feedback loop allows the system to detect deviations caused by transducer geometric errors and tissue inhomogeneities, then adjust the drive signals to correct these errors and achieve accurate focusing.
Solution Approach 2:
The system uses the target region itself (or an acoustic reflector placed there) as the reference for calibration. By measuring reflections from the actual treatment site, the system automatically determines the corrections needed for each transducer element, eliminating the need for external calibration equipment or complex manual adjustments.
2Measurement precision
If acoustic reflectors are used for calibration, then the measurement precision improves, but the treatment time increases due to iterative echo-signal measurements for each target region
Solution Approach 1:
The system performs calibration by transmitting ultrasound waves and measuring reflections in advance of the actual treatment. This preliminary calibration step establishes the correct phase and amplitude values for all transducer elements before treatment begins, eliminating the need for repeated measurements during treatment of multiple target regions.
Solution Approach 2:
The calibration parameters obtained from measuring reflections at one target region are applied universally to focus ultrasound at multiple different target regions. By determining the corrections needed to account for transducer errors and tissue aberrations once, the system can efficiently treat multiple regions without repeating the full calibration process for each one.
3Manufacturing precision
If all transducer elements are calibrated individually, then the focusing quality improves, but the complexity of operation increases due to the need for individual echo-signal measurements
Solution Approach 1:
The system performs comprehensive calibration of all transducer elements in advance by measuring reflections from the target region. This preliminary action collects the necessary phase and amplitude information for all elements simultaneously, eliminating the need for operators to perform individual measurements and adjustments during treatment.
Solution Approach 2:
The system automatically measures the actual reflections received by each transducer element and uses this feedback to compute the precise phase and amplitude values needed for optimal focusing. This automated feedback process eliminates manual intervention and simplifies operation while achieving high focusing quality across all transducer elements.
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 enables the creation of high-quality ultrasound foci at multiple target regions efficiently, reducing treatment time and minimizing damage to non-target tissue by compensating for geometric errors and beam aberrations, even in complex tissue structures like the brain.
Implementation Method 1
an acoustic reflector, such as microbubbles, to analyze reflection signals
Implementation Method 2
transmit ultrasound waves to a target region and measure reflections of the ultrasound waves
Implementation Method 3
a piezoceramic transducer is placed externally to the patient, but in close proximity to the tissue to be ablated. The transducer converts an electronic drive signal into mechanical vibrations, resulting in the emission of acoustic waves
Data Source
AI summary
Various approaches for focusing an ultrasound transducer having multiple transducer elements include causing the transducer elements to transmit ultrasound waves to a first one or more target regions and measure reflections of the ultrasound waves off the first one or more target regions; and based at least in part on the measured reflections, determining a parameter value associated with at least one of the transducer elements so as to generate an ultrasound focus at a second target region, different from the first one or more target regions.