Thermal Safety of Vibro-Acoustography Using a Confocal Transducer

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Vibro-acoustography (VA) is an imaging method that forms a two-dimensional (2-D) image by moving two cofocused ultrasound beams with slightly different frequencies over the object in a C-scan format and recording acoustic emission from the focal region at the difference frequency. This article studies tissue heating due to a VA scan using a concentric confocal transducer. The three-dimensional (3-D) ultrasound intensity field calculated by Field II is used with the bio-heat equation to estimate tissue heating due to ultrasound absorption. Results calculated with thermal conduction and with blood perfusion, with conduction and without perfusion and without conduction and without perfusion are compared. Maximum heating due to ultrasound absorption occurs in the transducer's near-field and maximum temperature rise in soft tissue during a single VA scan is below 0.05°C for all three attenuation coefficients evaluated: 0.3, 0.5 and 0.7 dB/cm/MHz. Transducer self-heating during a single VA scan measured by a thermocouple is less than 0.27°C. (E-mail: chen.shigao@mayo.edu).

Original languageEnglish (US)
Pages (from-to)343-349
Number of pages7
JournalUltrasound in Medicine and Biology
Volume36
Issue number2
DOIs
StatePublished - Feb 2010

Fingerprint

Elasticity Imaging Techniques
Transducers
Heating
safety
transducers
Hot Temperature
Safety
heating
Perfusion
conduction
acoustic emission
attenuation coefficients
thermocouples
Acoustics
blood
format
near fields
recording
thermodynamics
Temperature

Keywords

  • Bio-heat equation
  • Tissue heating
  • Vibro-acoustography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Biophysics

Cite this

Thermal Safety of Vibro-Acoustography Using a Confocal Transducer. / Chen, Shigao D; Aquino, Wilkins; Alizad, Azra; Urban, Matthew W; Kinnick, Randall; Greenleaf, James F; Fatemi, Mostafa.

In: Ultrasound in Medicine and Biology, Vol. 36, No. 2, 02.2010, p. 343-349.

Research output: Contribution to journalArticle

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