Multi-Frequency Transducer Array for Broad-Bandwidth Ultrasound Imaging
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Solution Overview
Problem
Piezoelectric transducer probes have narrow operational frequency bandwidths, limiting their use to specific applications and requiring multiple probes for different frequencies, which is inefficient and costly.
Innovation Solution
A multi-frequency transducer array is developed with piezoelectric elements formed from multiple sub-elements, each with a different resonance frequency, allowing for a hybrid element configuration that operates across a wide range of frequencies while maintaining sensitivity and resolution, fabricated via a wafer level approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transducer array is used for both transmit and receive functions, then device complexity is reduced, but image quality and signal-to-noise ratio deteriorate due to cross-talk and limited aperture
Solution Approach 1:
The system divides the transducer functionality into separate transmit and receive arrays. The transmit array and receive array are distinct physical entities, each optimized for their specific function. This segmentation eliminates cross-talk between transmit and receive elements while maintaining manageable system complexity through independent array design and control.
Solution Approach 2:
A switch matrix serves as an intermediary component that selectively connects transmit and receive transducers to the appropriate signal paths. The switch matrix enables flexible routing of electrical signals between the pulser, receive array, and detection system without direct permanent connections, allowing dynamic reconfiguration while preventing harmful cross-talk.
2Measurement precision
If multiple transducer arrays are used for transmit and receive functions, then image quality and signal-to-noise ratio improve, but device complexity increases
Solution Approach 1:
Both the transmit array and receive array can operate as either transmit or receive arrays depending on the operational mode. The system can function in full duplex mode with simultaneous transmit and receive, or in half duplex mode where the roles can be swapped. This multi-functionality reduces the need for completely separate dedicated arrays for each function.
Solution Approach 2:
The system dynamically reconfigures the roles of transducer arrays between transmit and receive functions based on operational requirements. The switch matrix enables real-time switching of array functions, allowing the system to adapt to different imaging modes and optimize performance for specific clinical applications.
3Use of energy by moving object
If continuous wave transmission is used, then power efficiency improves, but range resolution deteriorates due to inability to distinguish reflection origins
Solution Approach 1:
The system uses pulsed wave transmission instead of continuous wave, transmitting ultrasound in periodic bursts with specific pulse repetition frequencies. This periodic action allows the system to listen for echoes during the intervals between pulses, enabling determination of reflection origins based on time-of-flight measurements while maintaining reasonable power efficiency through intermittent transmission.
4Measurement precision
If pulsed wave transmission is used, then range resolution improves, but power efficiency worsens due to intermittent transmission
Solution Approach 1:
The system maintains continuous useful action by overlapping pulse transmission with echo reception in a full duplex configuration. While one array transmits pulses, another array simultaneously receives echoes, ensuring that the imaging function continues without interruption. This approach maximizes the utilization of transmitted energy and maintains high imaging throughput.
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 high sensitivity and resolution across a broader frequency range, reducing the need for multiple probes and lowering manufacturing costs through scalable production.
Implementation Method 1
transmitting, with a first transducer array, a plurality of ultrasound waves into a patient's body at a first frequency
Implementation Method 2
receiving, with the first transducer array, the first backscattered echoes from tissue structures within the patient's body and converting the first backscattered echoes into a plurality of first electrical signals
Implementation Method 3
transmitting, with a second transducer array, a plurality of ultrasound waves into the patient's body at a second frequency
Implementation Method 4
receiving, with the second transducer array, the second backscattered echoes from tissue structures within the patient's body and converting the second backscattered echoes into a plurality of second electrical signals
Implementation Method 5
processing the first electrical signals and the second electrical signals to generate a plurality of different images of the tissue structures at different spatial resolutions
Data Source
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AI summary
Various methods and systems are provided for a multi-frequency transducer array. In one example, the transducer array includes an element formed of one or more sub- elements, at least one sub-element having a different resonance frequency. A frequency range of the transducer array may thereby be broadened.