Document Detail

Relative Blood Flow Changes Measured Using Calibrated Frequency-Weighted Doppler Power at Different Hematocrit Levels.
MedLine Citation:
PMID:  24462159     Owner:  NLM     Status:  Publisher    
In theory, the power of a trans-cranial Doppler signal may be used to measure changes in blood flow and vessel diameter in addition to velocity. In this study, a flow index (FI) of relative changes in blood flow was derived from frequency-weighted Doppler power signals. The FI, plotted against velocity, was calibrated to the zero intercept with absent flow to reduce the effects of non-uniform vessel insonation. An area index was also calculated. FIs were compared with actual flow in four silicone tubes of different diameter at increasing flow rates and increasing hematocrit (Hct) in a closed-loop phantom model. FI values were strongly correlated with actual flow, at constant Hct, but varied substantially with changes in Hct. Percentage changes in area indexes, relative to the 4-mm tube, were strongly correlated with tube cross-sectional area. The implications of these results for in vivo use are discussed.
Sean Wallace; Nicola Logallo; Kashif W Faiz; Christian Lund; Rainer Brucher; David Russell
Related Documents :
23450839 - An intraoral thermoregulatory organ in the bowhead whale (balaena mysticetus), the corp...
2075749 - Pharmacokinetics of sulphadimethoxine in channel catfish (ictalurus punctatus).
126859 - Metabolism of 14c-dehydroepiandrosterone in female adipose tissue and venous blood.
1725919 - Blood clearance of dextran magnetite particles determined by a noninvasive in vivo esr ...
10750329 - Current status and future challenges in cerebral blood flow mapping in intracranial tum...
24660089 - Preliminary study of the influence of red blood cells size on the determinism of the br...
23213439 - Connexin26-mediated transfer of laterality cues in xenopus.
20400349 - Computational study of pulsatile blood flow in prototype vessel geometries of coronary ...
235869 - Pulmonary function in asymptomatic adolescents with idiopathic scoliosis.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-1-22
Journal Detail:
Title:  Ultrasound in medicine & biology     Volume:  -     ISSN:  1879-291X     ISO Abbreviation:  Ultrasound Med Biol     Publication Date:  2014 Jan 
Date Detail:
Created Date:  2014-1-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410553     Medline TA:  Ultrasound Med Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Heterogeneous Echogenicity of the Thyroid Parenchyma Does Not Influence the Detection of Multi-focal...
Next Document:  Magnetic Resonance Imaging for the Exploitation of Bubble-Enhanced Heating by High-Intensity Focused...