Absolute determination of ultrasonic intensity in a diagnostic Doppler ultrasound equipment

Absolute ultrasonic intensity from pencil type Doppler-shift probes has been measured using a radiation balance technique. Accuracy and repeatability of measurement have been considered and effects of using different absorbing materials and different liquids other than degassed water on intensity measured have also been discussed. The technique is recommended for routine monitoring of intensity levels from Doppler ultrasound equipment used by clinicians for in-vivo blood flow measurements in hospitals. In conclusion, basic requirements for accurate measurement of ultrasonic intensity using this technique have been suggested.