An optically-transparent PVDF transducer array for photoacoustic tomography

Hu, He; Fang, Cheng; Zou, Jun

doi:10.1117/12.2609268

Cited by 1 publication

(1 citation statement)

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“…However, limited material selection for transparent matching and backing layers worsens the fractional bandwidth and sensitivity of these type of transducers. PVDF (polyvinylidene fluoride) polymer is another commonly used material in developing transparent piezoelectric transducers [12], [13], [14], which due to its lower acoustic impedance, does not require matching and backing layers resulting in a wideband operation. Poor electromechanical coupling factor of PVDF-based transducers, however, limits their transmit and receive performance compared to other piezoelectric materials [15].…”

Section: Introductionmentioning

confidence: 99%

Transparent Dual-Frequency CMUT Arrays for Photoacoustic Imaging

Ghavami,

Sobhani,

Zemp

2023

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The opaque ultrasound transducers used in conventional photoacoustic imaging systems necessitate oblique light delivery, which gives rise to some disadvantages such as inefficient target illumination and bulky system size. This work proposes a transparent capacitive micromachined ultrasound transducer (CMUT) linear array with dual-band operation for throughillumination photoacoustic imaging. Fabricated using an adhesive wafer bonding method, the array consists of optically transparent conductors (ITO) as both top and bottom electrodes, a transparent polymer (BCB) as the sidewall and adhesive material, and largely transparent silicon nitride as the membrane. The fabricated device had a maximum optical transparency of 76.8% in the visible range. Furthermore, to simultaneously maintain higher spatial resolution and deeper imaging depth, this dualfrequency array consists of low and high frequency channels with 4.2 and 9.3 MHz center frequencies, respectively, which are configured in an interlaced architecture to minimize the grating lobes in the receive point spread function. With a wider bandwidth compared to the single frequency case, the fabricated transparent dual-frequency CMUT array was used in throughillumination photoacoustic imaging of wire targets demonstrating an improved spatial resolution and imaging depth.

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Section: Introductionmentioning

confidence: 99%