Bastiaans, O.L.

videodensity curve contrast injection analysis decay echocardiographic patient meltzer videodensity curves contrast injections study log videodensity correlation indicator-dilution curves bommer frame decay phase indicator-dilution videodensitometric coefficient overload video demaria shunt correlation coefficient apical four-chamber view heart venous injection recording contrast appearance operator range echocardiographic recordings panel mono-exponential decay echocardiography effect information ventricle microbubble duration intensity signal output mono-exponential contrast effect phase echocardiographic studies sample contrast injection display circulation fraction system right photoelectric cell wedge precision microbubbles 14 patients wedge injections density sample area bastiaan videodensity analysis data analysis roelandt left-to-right shunts videodensitometric analysis test area mason videotape contrast intensity 32 injections heart j advantage videodensitometric processing intracardiac shunts program structure