A computer program for automatic recording and processing of renograms.
A program is described, which performs automatic uptake, plotting and processing of radio-hippuran renograms obtained from a gamma camera, using an on-line minicomputer system. The program is written in machine language for a ND 50/50 system equipped with a PDP8-L processor, but translation for other nuclear medicine EDP system is easy. Minimum configuration requirements are: (i) 4K processor with TTY; (ii) external clock; (iii) magnetic tape transport; and (iv) 4K + 4K buffered camera interface or additional 8K of storage plus camera interface. Camera interface is computer-controlled and includes two AD-converters, a display unit for buffer storage and interest-areas selection facility. Operation starts recording 40 scintiphotographs of 30 sec each. Then, kidney uptake curves are obtained by subtraction of blood and tissue background, and diagnostic parameters, such as the initial slope, the maximum uptake point and 50% activity time, are computed. The only manual intervention required is the computer-assisted selection of interest-areas of kidneys, and blood and tissue background. Time required is 20 min for uptake of renograms and 5 min for processing and output, thus allowing routine execution of good quality renography, including hardcopy printout of both kidney uptake curves and diagnostic paramerers.