Computer Analysis Of Cineventriculogram
Samir Manoli, Mark Wuthnow, RUDY VELASQUEZ, Zainul Abedin · Journal of Clinical Engineering · 1985
This paper reports on the development of a computer program to obtain velocity of contraction, velocity of relaxation, and chamber volume utilizing cinefluorographic films of the left ventricle. The volume of the left ventricle is determined by calculating the volume of each quadrant. Velocity of contraction and velocity of relaxation are calculated by dividing the distance by the contraction time or relaxation time, respectively. Furthermore, normalized velocities of contraction and of relaxation are computed for normalized times; the values that would result if the heart rate were 60 beats per minute. Ejection volume is calculated for each quadrant, as well as for the total left ventricle. The system was developed on a PDP 11/45 computer using Version 6 of the Unix operating system. The program was written in the BASIC+ language. This method was evaluated on 20 patients (nine patients had normal global ejection fraction > 50%, the remaining 11 patients had a global ejection fraction of <50%). The results showed a high repeatability of the data analyzed.