Computer radiocirculogram analysis

External x-ray recording from radiopharmaceuticals is used in examining linear blood flow in organs and tissues. The method is called radiocirculography and is most widely used in neurology, particularly to examine brain vessels. The hemodynamic state is evaluated from the shapes of the activity-time curves and from the time intervals between these curves, which are interpreted as parameters of the hemodynamic phases (arterial, capillary, and venous).