Quantitative ultrasound assessment of HIFU induced lesions in rodent liver

Jeremy Kemmerer, Goutam Ghoshal, Michael Oelze

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

Abstract

Quantitative ultrasound (QUS) techniques have been used for tissue characterization by discriminating between tissues of differing microstructure. High Intensity Focused Ultrasound (HIFU) is a means for minimal or non-invasive therapy, which results in changes in tissue microstructure. However, significant challenges remain for the monitoring and assessment of HIFU therapy. Conventional B-mode imaging is not reliable for detection and assessment of thermal lesions produced by HIFU. Because of QUS sensitivity to microstructure changes, it was hypothesized that QUS could assess thermal lesions. A 1-MHz single-element focused transducer (f/1.1) was used to produce thermal lesions in ex-vivo rat liver. The focal intensities used to generate lesions were measured to be between 1500 and 2500 W/cm2 in degassed water using a calibrated needle hydrophone. These exposures were monitored using a clinical ultrasound array (L14-5, Ultrasonix). Treated and untreated regions as determined by histology and visual inspection were compared to parametric images of QUS parameters (Effective Scatterer Diameter (ESD), and Effective Acoustic Concentration (EAC)). An average increase in ESD of 15% was observed in three samples, while EAC estimates decreased by 4.3 dB. These findings suggest that QUS can be used for non-invasive assessment of thermal lesions.

Original languageEnglish (US)
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Pages1396-1399
Number of pages4
DOIs
StatePublished - Dec 1 2010
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: Oct 11 2010Oct 14 2010

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117

Other

Other2010 IEEE International Ultrasonics Symposium, IUS 2010
CountryUnited States
CitySan Diego, CA
Period10/11/1010/14/10

Keywords

  • HIFU
  • Quantiative ultrasound
  • Tissue characterization

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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    Kemmerer, J., Ghoshal, G., & Oelze, M. (2010). Quantitative ultrasound assessment of HIFU induced lesions in rodent liver. In 2010 IEEE International Ultrasonics Symposium, IUS 2010 (pp. 1396-1399). [5935845] (Proceedings - IEEE Ultrasonics Symposium). https://doi.org/10.1109/ULTSYM.2010.5935845