Document Detail


Optimum acoustic frequency for focused ultrasound surgery.
MedLine Citation:
PMID:  8059488     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A model is described that enables calculation of ultrasound lesioning rate (inverse of time to achieve a threshold lesion in the absence of thermal redistribution) as a function of acoustic frequency, tissue penetration depth, d, attenuation coefficient at specific frequency, mu, and power of dependence of attenuation on frequency, n. Two acoustic power conditions are considered: unlimited power, and power limited by the material properties of the transducer and the constraint that its dimensions be scaled to tissue penetration depth. Optimum frequencies for these two conditions are found to be, respectively, [(2 + n)/n mu d]1/n and [(3 - n)/n mu d]1/n. The tissue path attenuation, for both conditions, is independent of frequency, with a value of approximately 10 dB. Values of predicted lesioning rates under optimum frequency conditions are presented, and the likely constraints imposed by cavitation and propagation nonlinearity are considered.
Authors:
C R Hill
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ultrasound in medicine & biology     Volume:  20     ISSN:  0301-5629     ISO Abbreviation:  Ultrasound Med Biol     Publication Date:  1994  
Date Detail:
Created Date:  1994-09-13     Completed Date:  1994-09-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410553     Medline TA:  Ultrasound Med Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  271-7     Citation Subset:  IM    
Affiliation:
Physics Department, Royal Marsden Hospital, Sutton, Surrey, UK.
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MeSH Terms
Descriptor/Qualifier:
Acoustics*
Models, Theoretical*
Temperature
Transducers
Ultrasonic Therapy*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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