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Ultrasonic Doppler measurement of renal artery blood flowImplantable pulsed Doppler ultrasonic flowmeter development has resulted in designs for application to the aortas of dogs and humans, and to human renal and coronary arteries. A figure of merit was derived for each design, indicating the degree of its precision. An H-array design for transcutaneous observation of blood flow was developed and tested in vitro. Two other simplified designs for the same purpose obviate the need to determine vessel orientation. One of these will be developed in the next time period. Techniques for intraoperative use and for implantation have had mixed success. While satisfactory on large vessels, higher ultrasonic frequencies and alteration of transducer design are required for satisfactory operation of pulsed Doppler flowmeters with small vessels.
Document ID
19740020482
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Date Acquired
September 3, 2013
Publication Date
July 1, 1974
Subject Category
Biosciences
Report/Patent Number
NASA-CR-138902
Accession Number
74N28595
Funding Number(s)
CONTRACT_GRANT: NGR-05-020-615
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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