Development of a 35-MHz piezo-composite ultrasound array for medical imaging

Cannata, J.M.; Williams, Jessica S.; Zhou, Qifa; Ritter, Timothy; Shung, K. Kirk

doi:10.1109/tuffc.2006.1588408

Cited by 218 publications

(133 citation statements)

References 30 publications

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“…To receive photoacoustic signals, we used a unique 30-MHz linear array transducer fabricated from a 2-2-piezo-composite by the NIH Transducer Resource Center at the University of Southern California [23]. The advantage of the piezocomposite material used in our application is that it offers high piezo-electric properties (important for transducing weak photoacoustic signals) while the acoustic impedance of the material is greatly improved compared to pure piezoceramics [23].…”

Section: High-frequency Ultrasound Array Transducermentioning

confidence: 99%

“…The advantage of the piezocomposite material used in our application is that it offers high piezo-electric properties (important for transducing weak photoacoustic signals) while the acoustic impedance of the material is greatly improved compared to pure piezoceramics [23]. Our array possessed 48 elements with 100-μm pitch (corresponding to 2λ where λ is the wavelength corresponding to the transducer center frequency), 19.1 dB compensated pulseecho insertion loss, and element cross-talk below 25 dB.…”

Section: High-frequency Ultrasound Array Transducermentioning

confidence: 99%

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Realtime photoacoustic microscopy in vivo with a 30-MHz ultrasound array transducer

Zemp¹,

Liu²,

Bitton³

et al. 2008

Opt. Express

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Abstract:We present a novel high-frequency photoacoustic microscopy system capable of imaging the microvasculature of living subjects in realtime to depths of a few mm. The system consists of a high-repetitionrate Q-switched pump laser, a tunable dye laser, a 30-MHz linear ultrasound array transducer, a multichannel high-frequency data acquisition system, and a shared-RAM multi-core-processor computer. Data acquisition, beamforming, scan conversion, and display are implemented in realtime at 50 frames per second. Clearly resolvable images of 6-μm-diameter carbon fibers are experimentally demonstrated at 80 μm separation distances. Realtime imaging performance is demonstrated on phantoms and in vivo with absorbing structures identified to depths of 2.5-3 mm. This work represents the first high-frequency realtime photoacoustic imaging system to our knowledge.

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Section: High-frequency Ultrasound Array Transducermentioning

confidence: 99%

Section: High-frequency Ultrasound Array Transducermentioning

confidence: 99%

Realtime photoacoustic microscopy in vivo with a 30-MHz ultrasound array transducer

Zemp¹,

Liu²,

Bitton³

et al. 2008

Opt. Express

View full text Add to dashboard Cite

show abstract

“…15 The array had 48 elements ͑of dimensions 82 m ϫ 2 mm͒ with 100-m spacing. The dimension of the element in the elevation direction was 2 mm, and the elements were focused in this direction with a fixed focal length of 8.2 mm, which provides a resolution of 200 m in the elevation direction within the ϳ3.5 mm focal zone.…”

Section: Ultrasound Array and Beamformingmentioning

confidence: 99%

Fast 3-D dark-field reflection-mode photoacoustic microscopy in vivo with a 30-MHz ultrasound linear array

et al. 2008

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Abstract. We present an in vivo dark-field reflection-mode photoacoustic microscopy system that performs cross-sectional ͑B-scan͒ imaging at 50 Hz with real-time beamforming and 3-D imaging consisting of 166 B-scan frames at 1 Hz with postbeamforming. To our knowledge, this speed is currently the fastest in photoacoustic imaging. A custom-designed light delivery system is integrated with a 30-MHz ultrasound linear array to realize dark-field reflection-mode imaging. Linear mechanical scanning of the array produces 3-D images. The system has axial, lateral, and elevational resolutions of 25, 70, and 200 m, respectively, and can image 3 mm deep in scattering biological tissues. Volumetric images of subcutaneous vasculature in rats are demonstrated in vivo. Fast 3-D photoacoustic microscopy is anticipated to facilitate applications of photoacoustic imaging in biomedical studies that involve dynamics and clinical procedures that demand immediate diagnosis.

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“…Piezoelectric materials, which transform the electrical stimuli to ultrasonic waves, are critical elements for ultrasonic imaging transducers. 1 The mainstay piezoelectric materials are the perovskite ferroelectrics, such as polycrystalline lead zirconate titanate (PZT) ceramics, 2 3 In recent years, due to the continuous growth in demand of clinical applications (e.g., dermatologic skin and ophthalmic imaging [4][5][6][7], ultrasonic arrays are expanding to higher frequency range, i.e., !20 MHz, which provide images with submillimeter-scale resolution. For achieving higher operational frequency of arrays, piezoelectric elements are required to work at smaller dimension/thickness.…”

Section: Introductionmentioning

confidence: 99%

“…For achieving higher operational frequency of arrays, piezoelectric elements are required to work at smaller dimension/thickness. With decreasing the size of piezoelectric elements, however, some new issues appear, i.e., high crosstalk, low signal-to-noise ratio, and the difficulty of electrical impedance matching, 7 due to the decreased capacitance and increased impedance of piezoelectric elements. It should be noted that the decreased capacitance is not only related to the reduced dimension of elements (the area and the thickness of the pillars need to keep the aspect ratio for longitudinal vibration mode) but also associated with the ferroelectric material itself.…”

Section: Introductionmentioning

confidence: 99%

[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications

Zhang

Luo

et al. 2016

Journal of Applied Physics

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Shrout, T. R. (2016).[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications. Journal of Applied Physics, 120 (7), 074105-1-074105-5.[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications AbstractThe electromechanical properties of [111]-oriented tetragonal Pb(In1/2Nb1/2O3)-Pb(Mg1/3Nb2/3O3)-PbTiO3 (PIN-PMN-PT) crystals were investigated for potential high frequency ultrasonic transducers. The domain-engineered tetragonal crystals exhibit an ultrahigh free dielectric permittivity ε33 T > 10 000 with a moderate electromechanical coupling factor k33 ∼ 0.79, leading to a high clamped dielectric permittivity ε33 S of 2800, significantly higher than those of the rhombohedral relaxor-PT crystals and high-K (dielectric permittivity) piezoelectric ceramics. Of particular significance is that the [111]-oriented tetragonal crystals were found to possess high elastic stiffness, with frequency constant N33 of ∼2400 Hz m, allowing relatively easy fabrication of high-frequency transducers. In addition, no scaling effect of piezoelectric and dielectric properties was observed down to thickness of 0.1 mm, corresponding to an operational frequency of ∼24 MHz. These advantages of [111]-oriented tetragonal PIN-PMN-PT crystals will benefit high-frequency ultrasonic array transducers, allowing for high sensitivity, broad bandwidth, and reduced noise/crosstalk. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsLi, F., Zhang, S., Luo, J., Geng, X. [111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications T > 10 000 with a moderate electromechanical coupling factor k 33 $ 0.79, leading to a high clamped dielectric permittivity e 33 S of 2800, significantly higher than those of the rhombohedral relaxor-PT crystals and high-K (dielectric permittivity) piezoelectric ceramics. Of particular significance is that the [111]-oriented tetragonal crystals were found to possess high elastic stiffness, with frequency constant N 33 of $2400 Hz m, allowing relatively easy fabrication of high-frequency transducers. In addition, no scaling effect of piezoelectric and dielectric properties was observed down to thickness of 0.1 mm, corresponding to an operational frequency of $24 MHz. These advantages of [111]-oriented tetragonal PIN-PMN-PT crystals will benefit high-frequency ultrasonic array transducers, allowing for high sensitivity, broad bandwidth, and reduced noise/crosstalk. Published by AIP Publishing. [http://dx

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Development of a 35-MHz piezo-composite ultrasound array for medical imaging

Cited by 218 publications

References 30 publications

Realtime photoacoustic microscopy in vivo with a 30-MHz ultrasound array transducer

Realtime photoacoustic microscopy in vivo with a 30-MHz ultrasound array transducer

Fast 3-D dark-field reflection-mode photoacoustic microscopy in vivo with a 30-MHz ultrasound linear array

[111]-oriented PIN-PMN-PT crystals with ultrahigh dielectric permittivity and high frequency constant for high-frequency transducer applications

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