| Attenuation coefficient and propagation speed estimates of rat and pig intercostal tissue as a function of temperature. | |
| | |
MedLine Citation:
|
PMID: 12403142 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Attenuation coefficient and propagation speed of intercostal tissues were estimated as functions of temperature (22, 30, and 37 degrees C) from fresh chest walls from eight 10- to 11-week-old female Sprague-Dawley (SD) rats, eight 21- to 24-week-old female Long-Evans (LE) rats, and ten 6- to 10-week-old mixed sex Yorkshire (York) pigs. The primary purpose of the study was to estimate the temperature dependence of the intercostal tissue's attenuation coefficient so that accurate estimates of the in situ (at the pleural surface) acoustic pressure levels could be made for our ultrasound-induced lung hemorrhage studies. The attenuation coefficient of intercostal tissue for both species was independent of the temperature at the discrete frequencies of 3.1 MHz (-0.0076, 0.0065, and 0.016 dB/cm/degrees C for SD rats, LE rats, and York pigs, respectively) and 6.2 MHz (-0.015, 0.014, and 0.014 dB/cm/degrees C for SD rats, LE rats, and York pigs, respectively). However, the temperature-dependent regressions yielded a significant temperature dependency of the intercostal tissue attenuation coefficients in SD and LE rats (over the 3.1 to 9.6 MHz frequency range); there was no temperature dependency in York pigs (over the 3.1 to 8.6 MHz frequency range). There was no significant temperature dependency of the intercostal tissue propagation speed in SD rats; there was a temperature dependency in LE rats and York pigs (-0.59, -1.6, and -2.9 m/s/degrees C for SD rats, LE rats, and York pigs, respectively). Even though the attenuation coefficient's temperature dependency was significant from the linear regression functions, the differences were not very great (-0.040 to -0.13, 0.011 to 0.18, and 0.055 to 0.10 dB/cm/degrees C for SD rats, LE rats, and York pigs, respectively, over the data frequency range). These findings suggest that it is not necessary to determine the attenuation coefficient of intercostal tissue at body temperature (37 degrees C), but rather it is sufficient to determine the attenuation coefficient at room temperature (22 degrees C), a much easier experimental procedure. |
| | |
Authors:
|
Rene T Towa; Rita J Miller; Leon A Frizzell; James F Zachary; William D O'Brien |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
|
Title: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Volume: 49 ISSN: 0885-3010 ISO Abbreviation: IEEE Trans Ultrason Ferroelectr Freq Control Publication Date: 2002 Oct |
Date Detail:
|
Created Date: 2002-10-29 Completed Date: 2002-12-04 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 9882735 Medline TA: IEEE Trans Ultrason Ferroelectr Freq Control Country: United States |
Other Details:
|
Languages: eng Pagination: 1411-20 Citation Subset: IM |
Affiliation:
|
Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 61801, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adipose Tissue
/
physiology,
ultrasonography Animals Body Temperature / physiology Female Intercostal Muscles / physiology, ultrasonography Male Models, Biological* Models, Statistical Pleura / physiology, ultrasonography Pressure Rats Rats, Long-Evans Rats, Sprague-Dawley Sensitivity and Specificity Skin / ultrasonography Skin Physiological Phenomena Species Specificity Swine Thorax / physiology*, ultrasonography* Ultrasonography / methods* |
| Grant Support | |
ID/Acronym/Agency:
|
HL58218/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Dynamics and fragmentation of thick-shelled microbubbles.
Next Document: Attenuation coefficient and propagation speed estimates of intercostal tissue as a function of pig a...