Linked Life Data

8162684

Source:http://linkedlifedata.com/resource/pubmed/id/8162684

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1994-5-26
pubmed:abstractText
Flow disturbance is known to occur in association with high grade carotid stenosis and cause spectral broadening and fluttering in the Doppler spectral waveform distal to the stenosis. Colour flow variance mapping has been proposed as a means of documenting its presence. We prospectively evaluated this hypothesis by studying 15 patients with high grade (> 50%) stenotic lesions in the internal carotid artery. In all 15 cases, the site of increased variance on the colour Doppler map corresponded to the point of maximum velocity. In 10 cases of greater than 75% stenosis, the point of aliasing on the traditional colour Doppler map and the site of maximal variance occurred at the stenotic jet (length 7.3 +/- 2.3 mm) and not along the full length of disturbed flow (19.3 +/- 5.5 mm). In five patients with stenoses between 50-75% diameter narrowing, decreasing the colour Doppler pulse repetition frequency (PRF) created a region of abnormal variance corresponding to the site of aliasing. In all 15 stenoses, the site of maximum flow disturbance, defined as fluttering in the Doppler spectral waveform, was not apparent on the variance map. We conclude that the variance map does not reflect flow disturbance and is most likely to occur at sites of aliasing.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0009-9260
pubmed:author
pubmed:issnType
Print
pubmed:volume
49
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
262-5
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Variance mapping in colour flow imaging: what does it measure?
pubmed:affiliation
Department of Radiology, Western Infirmary, Glasgow, UK.
pubmed:publicationType
Journal Article