Systolic time intervals measured by pulsed ultrasound-Doppler

A new method for measuring systolic time intervals (STI) is presented. By using a pulsed ultrasound Doppler-velocity-meter, which is able to differentiate the velocity signals, it is possible to pick up signals just above the aortic valve. Combining the velocity signals and an ECG, the STI can be measured. The STI measured by this method were compared with STI measured by using a phonocardiograph. The results showed no significant difference.