Nuclear cardiac blood volume detecting apparatus
US4197836A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1978 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Jan 25, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/161
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.