Thermal safety of vibro-acoustography using a confocal transducer.

Journal Article (Journal Article)

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 degrees 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 degrees C.

Full Text

Duke Authors

Cited Authors

  • Chen, S; Aquino, W; Alizad, A; Urban, MW; Kinnick, R; Greenleaf, JF; Fatemi, M

Published Date

  • February 2010

Published In

Volume / Issue

  • 36 / 2

Start / End Page

  • 343 - 349

PubMed ID

  • 20113864

Pubmed Central ID

  • PMC2835550

Electronic International Standard Serial Number (EISSN)

  • 1879-291X

International Standard Serial Number (ISSN)

  • 0301-5629

Digital Object Identifier (DOI)

  • 10.1016/j.ultrasmedbio.2009.10.003


  • eng