Acoustic characterization of multi-element, dual-frequency transducers for high-intensity contact ultrasound therapy

M. Burtnyk, W. A. N'Djin, L. Persaud, M. Bronskill, R. Chopra

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


High-intensity contact ultrasound therapy can generate precise volumes of thermal damage in deep-seated tissue using interstitial or intracavitary devices. Multi-element, dual-frequency transducers offer increased spatial control of the heating pattern by enabling modulation of ultrasound power and frequency along the device. The performance and acoustic coupling between elements of simple, multi-element, dual-frequency transducers was measured. Transducer arrays were fabricated by cutting halfway through a rectangular plate of PZT, creating individual 4 × 5 mm segments with fundamental frequency (4.1 MHz) and third harmonic (13.3 MHz). Coupling between elements was investigated using a scanning laser vibrometer to measure transducer surface displacements at each frequency and different acoustic powers (0, 10, 20 W/cm2). The measured acoustic power was proportional to the input electrical power with no hysteresis and efficiencies >50% at both frequencies. Maximum transducer surface displacements were observed near element centers, reducing to ∼1/3-maximum near edges. The power and frequency of neighboring transducer segments had little impact on an element's output. In the worst case, an element operating at 4.1 MHz and 20 W/cm2 coupled only 1.5 W/cm2 to its immediate neighboring element. Multi-element, dual-frequency transducers were successfully constructed using a simple dicing method. Coupling between elements was minor, therefore the power and frequency of each transducer element could be considered independent.

Original languageEnglish (US)
Title of host publication11th International Symposium on Therapeutic Ultrasound
Number of pages6
StatePublished - 2012
Event11th International Symposium on Therapeutic Ultrasound, ISTU 2011 - New York, NY, United States
Duration: Apr 11 2011Apr 13 2011

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other11th International Symposium on Therapeutic Ultrasound, ISTU 2011
Country/TerritoryUnited States
CityNew York, NY


  • Acoustic coupling
  • Dual-frequency
  • Laser vibrometer
  • Transducer arrays

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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