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Main Title Analog Echocardiogram for Estimating Ventricular Stroke Volume.
Author Petrovick, M. L. ; Malindzak, Jr., G. S. ; Haak, Jr., E. D. ;
CORP Author Health Effects Research Lab., Research Triangle Park, N.C.
Year Published 1976
Report Number EPA/600/J-76/066;
Stock Number PB-268 120
Additional Subjects Heart function tests ; Cardiography ; Medical equipment ; Ultrasonic frequencies ; Biomedical measurement ; Feasibility studies ; Signal processing ; Analog systems ; Reprints ; Echocardiography ; Cardiac output ; Noninvasive tests ; Signal processing systems ; Image processing
Library Call Number Additional Info Location Last
NTIS  PB-268 120 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
Abstract A multiple range-gated echocardiographic signal processor has been developed for the purpose of converting the complex ultrasonic image of the left ventricular anterior and posterior wall boundaries to equivalent analog signals as a means of estimating stroke volume and computing cardiac output. Two conventional time-analog range-gated modules have been redesigned and synchronized with the initial transmit pulse of 1000 hz, for the purpose of simultaneously gating echocardiographic images of the anterior and posterior left ventricular walls. Each echocardiographic image boundary is selectively gated in the A-Mode and adjusted to a width exceeding the maximum wall motion. The gated echocardiographic boundary of each time-analog channel is processed by a fast-attack envelope detector and a low-pass filter network to produce a D.C. analog signal corresponding to the motion of the left ventricular anterior and posterior wall. These analog signals serve as the basis for the estimation of ventricular stroke volume and the computation of cardiac output.
Supplementary Notes Pub. in Ultrasound in Medicine, v2 p351-361 1976.
NTIS Title Notes Journal article.
Title Annotations Reprint: An Analog Echocardiogram for Estimating Ventricular Stroke Volume.
PUB Date Free Form 1976
Category Codes 6L; 95C
NTIS Prices PC A02/MF A01
Primary Description 600/11
Document Type NT
Cataloging Source NTIS/MT
Control Number 323718811
Origin NTIS
Type CAT