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A Study on Capacitive Micromachined Ultrasonic Transducer Periodic Sparse Array
Tian Zhang1,2, Wendong Zhang1,2, Xingling Shao1,2
1State Key Laboratory of Dynamic Testing Technology, North University of China, Taiyuan 030051, China.
Micromachines
|July 2, 2021
Summary
This study eliminates grating lobes in capacitive micromachined ultrasonic transducer (CMUT) arrays using periodic sparse array (PSA) pairs. Optimized PSA configurations reduce imaging artifacts, advancing CMUTs for 3D ultrasound.
Area of Science:
- Microelectromechanical Systems (MEMS)
- Ultrasonic Transducer Technology
- Medical Imaging
Background:
- Capacitive micromachined ultrasonic transducers (CMUTs) offer high element density but increase hardware complexity.
- Reducing active channels in CMUT arrays is crucial for practical applications.
- Grating lobes are a common issue in periodic transducer arrays.
Purpose of the Study:
- To investigate and mitigate grating lobes in CMUT periodic sparse array (PSA) pairs.
- To reduce hardware complexity and imaging artifacts in CMUT-based systems.
- To optimize PSA configurations for improved 3D ultrasound imaging.
Main Methods:
- Designing active element positions for transmit and receive processes in CMUT PSA pairs.
- Simulating effective aperture and beam patterns to analyze grating lobe generation.
- Conducting experiments with a 256-element CMUT linear array for point target imaging.
Main Results:
- Simulation results demonstrate the elimination of common grating lobes (CGLs) through optimized PSA design.
- The study identified optimal sparse array configurations for a given sparse factor (SF).
- Experimental validation confirmed the reduction of imaging artifacts with PSA pairs.
Conclusions:
- Optimized CMUT PSA pairs effectively eliminate common grating lobes.
- Selecting optimal sparse array configurations significantly reduces imaging artifacts.
- This research is vital for the advancement of CMUTs in 3D ultrasound imaging.
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