Nuclear cardiac blood volume detecting apparatus

Details Nuclear cardiac blood volume detecting apparatus Nuclear cardiac blood volume detecting apparatus

1978-01-25

1980-04-15

Howell, Kyle L.

Surgery

Truss

Pad

250363S, 128659, 128713, A61B 600

Patent

active

041978366

ABSTRACT:
A built up image illustrating blood volume in the heart versus time taken over many cardiac cycles is produced by continuously displaying a graph of cumulative data indicating the amount of radioactivity from a tracer in the blood detected in the heart during each of a series of intervals into which the average cardiac period is divided. The parallel lines of a raster scan display correspond respectively to the memory channels. The count stored in a particular memory channel causes the video signal for the corresponding line to be maintained at a binary level for a corresponding time interval thus generating a bar graph in which the length of each bar indicates the amount of radioactivity sensed during the corresponding interval of the cardiac cycle. As each memory channel accumulates radioactivity data with each successive cardiac cycle, each bar displayed in the bar graph lengthens to indicate the cumulative activity until an interpretable curve is obtained.

REFERENCES:
patent: 3221731 (1965-12-01), Annis et al.
patent: 3528407 (1970-09-01), Vigoulet
patent: 3777142 (1973-12-01), Grenier et al.
patent: 3860822 (1975-01-01), Owens, Jr.
Hoffmann, G. et al., Nuclear-Medizin, 7, 1968, pp. 350-370.

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