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Published on: May 29, 2014
Acoustic coupling in capacitive microfabricated ultrasonic transducers: modeling and experiments
Alessandro Caronti1, Alessandro Savoia, Giosuè Caliano
1Dipartimento di Ingegneria Elettronica, Università Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy. caronti@uniroma3.it
Summary
Acoustic interactions in capacitive microfabricated ultrasonic transducers (CMUTs) were studied. These interactions, similar to sonar arrays, are a major source of cross-coupling, impacting medical ultrasound image quality.
Area of Science:
- Acoustics
- Microelectromechanical systems (MEMS)
- Medical Imaging
Background:
- Capacitive microfabricated ultrasonic transducers (CMUTs) are arrays of membranes used in medical ultrasound.
- Acoustic interactions between elements in transducer arrays can affect performance.
- Understanding these interactions is crucial for improving CMUT-based imaging.
Purpose of the Study:
- To investigate acoustic coupling and interaction effects in CMUTs.
- To determine the primary mechanisms of cross-coupling in CMUT arrays.
- To validate simulation models with experimental data.
Main Methods:
- Finite-element modeling (FEM) was used to simulate acoustic interactions.
- Laser interferometry was employed for experimental measurements of membrane displacement.
- Comparison of FEM results with optical measurements.
Main Results:
- Acoustic interaction effects were observed between CMUT membranes in immersion.
- FEM simulations showed good agreement with experimental displacement measurements.
- Acoustic coupling through the liquid medium was identified as a significant cross-coupling source.
Conclusions:
- Acoustic interactions are a major contributor to cross-coupling in CMUTs.
- FEM is a reliable tool for studying these acoustic interactions.
- Minimizing cross-coupling is essential for reducing artifacts and enhancing medical ultrasound image quality.
