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Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
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A Photoacoustic Imaging Device Using Piezoelectric Micromachined Ultrasound Transducers (PMUTs)
Summary
This study presents a piezoelectric micromachined ultrasound transducer (PMUT) array for photoacoustic imaging (PAI). The developed PMUT array successfully demonstrated B-mode PAI in tissue phantoms, paving the way for advanced imaging applications.
Area of Science:
- Biomedical Engineering
- Acoustic Imaging
- Materials Science
Background:
- Photoacoustic imaging (PAI) offers high resolution and contrast for biological tissue visualization.
- Developing miniaturized and efficient ultrasound transducer arrays is crucial for advancing PAI technology.
- Piezoelectric micromachined ultrasound transducers (PMUTs) are promising candidates for PAI due to their small size and high frequency response.
Purpose of the Study:
- To fabricate and characterize a linear piezoelectric micromachined ultrasound transducer (PMUT) array for photoacoustic imaging (PAI).
- To integrate the PMUT array into a PAI system for imaging tissue phantoms.
- To evaluate the performance of the PMUT array in terms of ultrasound pressure output, receive sensitivity, and photoacoustic bandwidth.
Main Methods:
- Fabrication of a 65-element linear PMUT array using lead zirconate titanate (PZT) thin film.
- Characterization of in-air vibration response and hydrophone measurements for ultrasound pressure output.
- Integration of the PMUT array with a custom PCB and optical fiber bundle for PAI.
- Photoacoustic imaging experiments using tissue phantoms with embedded light-absorbing targets.
Main Results:
- PMUT array elements exhibited a first mode resonance between 6 and 8 MHz.
- Average peak ultrasound pressure output of 16.2 kPa at 7.5 mm with a 5 Vpp input.
- Receive sensitivity of approximately 0.48 mV/kPa per element.
- Observed a broad photoacoustic bandwidth of ~89% from pencil lead targets.
- Successfully demonstrated B-mode PAI in tissue phantoms using linear scanning of a single PMUT element.
Conclusions:
- The fabricated linear PMUT array is suitable for PAI applications.
- The PMUT array demonstrates effective ultrasound generation and reception for photoacoustic signal acquisition.
- The integrated system successfully enabled B-mode PAI of tissue phantoms, highlighting the potential of PMUTs in this field.
