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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
1
|
| pubmed:dateCreated |
1996-12-6
|
| pubmed:abstractText |
Breath-hold velocity-encoded cine MR (VENC-MR) imaging is a feasible method for measuring phasic blood flow velocity in small vessels that move during respiration. The purposes of the current study are to compare breathhold VENC-MR measurements of flow velocities in the internal mammary arteries (IMA) with nonbreath-hold measurements and to characterize the systolic and diastolic flow velocity curves in a cardiac cycle in native IMA and IMA grafts. Flow velocity in 30 native IMA and 8 IMA grafts were evaluated with a breath-hold VENC-MR sequence with K-space segmentation and view-sharing reconstruction (TR/TE = 16/9 msec, VENC = 100 cm/s). In 10 native IMA, nonbreath-hold VENC-MR images were acquired as well for comparison. Breath-hold VENC-MR imaging showed significantly higher systolic and diastolic peak velocities in native IMA (43.1 cm/second +/- 15.0 and 10.0 cm/second +/- 4.8), in comparison to those of nonbreath-hold VENC-MR imaging (27.6 cm/second +/- 10.2 and 7.3 cm/second +/- 3.9, P < .05). The diastolic/systolic peak velocity ratio in the IMA grafts (.88 +/- .41) was significantly higher than that in native IMA (.24 +/- .08, P < .01). Interobserver variability in the flow velocity measurement was less than 4%. Breath-hold VENC-MR imaging demonstrated higher peak flow velocity in the IMA than nonbreath-hold VENC-MR imaging. This technique is a rapid and effective method for the noninvasive assessment of blood flow velocity in IMA grafts.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:issn |
1053-1807
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
6
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
219-22
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| pubmed:dateRevised |
2004-11-17
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| pubmed:meshHeading |
pubmed-meshheading:8851431-Adult,
pubmed-meshheading:8851431-Aged,
pubmed-meshheading:8851431-Blood Flow Velocity,
pubmed-meshheading:8851431-Coronary Artery Bypass,
pubmed-meshheading:8851431-Coronary Circulation,
pubmed-meshheading:8851431-Feasibility Studies,
pubmed-meshheading:8851431-Female,
pubmed-meshheading:8851431-Humans,
pubmed-meshheading:8851431-Magnetic Resonance Imaging,
pubmed-meshheading:8851431-Male,
pubmed-meshheading:8851431-Mammary Arteries,
pubmed-meshheading:8851431-Middle Aged,
pubmed-meshheading:8851431-Observer Variation,
pubmed-meshheading:8851431-Reproducibility of Results,
pubmed-meshheading:8851431-Respiration
|
| pubmed:articleTitle |
Breath-hold MR measurements of blood flow velocity in internal mammary arteries and coronary artery bypass grafts.
|
| pubmed:affiliation |
Department of Radiology, University of California, San Francisco 94143-0628, USA.
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| pubmed:publicationType |
Journal Article
|