Linked Life Data

2525830

Source:http://linkedlifedata.com/resource/pubmed/id/2525830

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1989-7-31
pubmed:abstractText
This paper describes the development of a Doppler flowmeter capable of measuring blood volume flow rate without the need to measure the vessel lumen area or beam-vessel angle. It requires the production of a uniform wide ultrasound beam to encompass the whole vessel and thus to produce a Doppler spectrum which corresponds to all the flowing blood, and a narrow reference beam placed within the lumen to compensate for various unknown quantities, such as tissue attenuation. The general definition of volume flow rate is described and applied to a new flowmeter, which allows an absolute value of volume flow rate to be measured independently of vessel size, beam-vessel angle, and tissue attenuation. By electronically apodising an annular array transducer in transmission and reception, a uniform wide beam and a narrow reference reception beam are produced. Theory to predict these beam patterns is developed and a computer simulation is made. The ultrasonic fields obtained from an annular array transducer in water are compared with the theoretical fields.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:issn
0301-5629
pubmed:author
pubmed:issnType
Print
pubmed:volume
15
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
169-78
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
A new approach to the noninvasive measurement of cardiac output using an annular array Doppler technique--I. Theoretical considerations and ultrasonic fields.
pubmed:affiliation
Department of Medical Physics, Bristol General Hospital, England.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't