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Relation of in vivo blood flow to ultrasound echogenicity

✍ Scribed by Dr. Junji Machi; Bernard Sigel; Julio C. Beitler; Julio C. U. Coelho; Jeffrey R. Justin

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
787 KB
Volume
11
Category
Article
ISSN
0091-2751

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✦ Synopsis

The mechanism of echogenicity of flowing blood during real-time ultrasonography was investigated experimentally in vivo by scanning venous and arterial blood and venous blood subjected to varying degrees of obstruction. Luminal echoes were more intense in flowing blood of the vena cava than in aortic blood of dogs. Vena cava and portal echoes increased in intensity as flow was decreased progressively by obstruction. We believe that an important cause of echogenicity of flowing blood is red cell aggregation which is greatest a t low shear rates (low flow velocity). Echogenicity decreases with increase in shear rate (higher flow velocity) which causes red cell disaggregation. Indexing Words: Ultrasound of blood flow . Blood flow echogenicity . Red cell aggregation . Real-time imaging of blood . Blood flow velocity

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