A high bandwidth transducer optimized for harmonic imaging

Hossack, John A.; Mauchamp, P.; Ratsimandresy, L.

doi:10.1109/ultsym.2000.921498

Cited by 36 publications

(25 citation statements)

References 4 publications

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“…Where, two PZT layers with thickness of 270 μm and 190 μm, respectively, were poled in the opposite direction and bonded together to form the multi frequency transducer. Hossack et al built a dual layer ultrasound transducer with the same poling direction for harmonic imaging at frequencies of 2 MHz / 4 MHz [7]. In this design, two 1-3 piezoelectric composite layers were activated together at fundamental frequency (2 MHz), and the top layer was used as the receiver of the second harmonic echo (4 MHz).…”

Section: Introductionmentioning

confidence: 99%

Design, fabrication and characterization of a bi-frequency co-linear array (7.5MHz/15MHz)

Wang

Jiang

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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Ultrasound imaging with high resolution and large field of depth is important in disease diagnosis, surgery guidance and post-surgery assessment. Conventional ultrasound imaging arrays work at a particular frequency, with -6dB fractional bandwidth of < 100%, limiting the resolution or field of depth in many ultrasound imaging cases. This paper presented design of a 7.5 MHz / 15 MHz bi-frequency co-linear array prototype with a wide bandwidth of 5MHz-20 MHz, which can be significant in a broad range of biomedical ultrasound imaging applications. To demonstrate the concept, a 32-element 1-D linear sub-array was fabricated, followed by element characterization and beamforming tests using a Verasonics system. Beam steering at +/-40 degree was achieved without obvious side lobes. The initial results suggest great potential of this bi-frequency co-linear array for medical imaging with high resolution and large field of depth.

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Section: Introductionmentioning

confidence: 99%

Design, fabrication and characterization of a bi-frequency co-linear array (7.5MHz/15MHz)

Wang

Jiang

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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“…In 1997, Gururaja described a dual layer transducer for harmonic imaging [5]. This design was adopted for a variety of broadband imaging research [6,7].…”

Section: Introductionmentioning

confidence: 99%

A dual-layer micromachined PMN-PT 1-3 composite transducer for broadband ultrasound imaging

Huang

Jiang

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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Broadband ultrasound imaging including tissue harmonic imaging usually captures acoustic information from the frequency higher than that of transmission waves, and has been widely studied in imaging for cardiology, bladder and other fluid-filled or cyst structures. Compared to the conventional pulseecho method, the broadband imaging possesses the advantages including contrast resolution enhancement, artifacts reduction, and improved signal-to-noise ratio. However, those benefits require broadband ultrasound transducers. In this paper, a micromachined PMN-PT 1-3 composite based dual frequency transducer was designed, fabricated and characterized.The transmitting sensitivity at 17.5 MHz reached 40KPa/V, and the receiving spectra magnitude was compared with a calibrated hydrophone under same test transducer transmitting. These results hold great potential for medical broadband imaging applications.

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“…These probes are generally aimed at improving harmonic imaging methods ͑tissue harmonic imaging and/or ultrasound contrast detection͒, [21][22][23][24] creating new ultrasound contrast detection schemes, 3,25 optimizing imaging and Doppler velocity estimation, 26 sizing of micro-emboli, 27 combining imaging with ultrasound generated/mediated therapy schemes or a combination of any of the aforementioned methods. [28][29][30][31][32][33] Takeuchi et al, 22 and Vos et al 24 constructed doublepeak frequency elements by tuning either the matching layer, or the matching and backing layers of a standard ultrasound element configuration.…”

Section: Introductionmentioning

confidence: 99%

“…Hossack et al 21 implemented a bi-layer piezo-electric transducer in a single element probe optimized for secondharmonic imaging. Each of the piezo-electric transducers had the same thickness, and by switching the effective polarity of the two layers between transmit and receive a wide-band probe was achieved.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear propagation acoustics of dual-frequency wide-band excitation pulses in a focused ultrasound system

Måsøy

Standal

Deibele

et al. 2010

The Journal of the Acoustical Society of America

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In this article, acoustic propagation effects of dual-frequency wide-band excitation pulses in a focused ultrasound system are demonstrated in vitro. A designed and manufactured dual-frequency band annular array capable of transmitting 0.9/7.5 MHz center frequency wide-band pulses was used for this purpose. The dual-frequency band annular array, has been designed using a bi-layer piezo-electric stack. Water tank measurements demonstrate the function of the array by activating the low- and high-frequency layers individually and simultaneously. The results show that the array works as intended. Activating the low- and high-frequency layers individually, results in less than -50 dB signal level from the high- and low-frequency layers respectively. Activating both layers simultaneously, produce a well defined dual-frequency pulse. The presence of the low-frequency pulse leads to compression, expansion, and a time delay of the high-frequency pulse. There is a phase shift between the low- and high-frequency pulse as it propagates from the array to the focus. This makes the latter described effects also dependent on the array configuration. By varying the low-frequency pressure, a shift of up to 0.5 MHz in center frequency of a 8.0 MHz transmitted high-frequency pulse is observed at the array focus. The results demonstrate the high propagation complexity of dual-frequency pulses.

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A high bandwidth transducer optimized for harmonic imaging

Cited by 36 publications

References 4 publications

Design, fabrication and characterization of a bi-frequency co-linear array (7.5MHz/15MHz)

Design, fabrication and characterization of a bi-frequency co-linear array (7.5MHz/15MHz)

A dual-layer micromachined PMN-PT 1-3 composite transducer for broadband ultrasound imaging

Nonlinear propagation acoustics of dual-frequency wide-band excitation pulses in a focused ultrasound system

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