Effect of interposed skin at Doppler flow estimation at 5 and 10 MHz. With a description of a calibration device

Flow measurements with high ultrasound frequencies (Doppler technique) can be used at quantitative estimations of flow. A calibrator for Doppler equipments is presented. The effect of skin as interposed material with 10 MHz and 5 MHz is discussed as are limitations in the apparatus itself especially when using 10 MHz ultrasound.