Doppler obstetric ultrasound: a graphical display of temporal changes in safety indices

Objective To investigate ultrasound use and exposure in pregnant women unde rgoing Doppler ultrasound investigation of the maternal and fetal circulati on using Doppler ultrasound techniques. Methods Sample graphical displays were generated showing duration of each m ode, thermal and mechanical index levels and overall elapsed time of scan a nd modes. Results The displays revealed combinations of scanner settings which delive red higher output intensity levels and which we subsequently altered in our practice to reduce ultrasound exposure. Conclusion A display of this type would enable monitoring of output levels and exposures, especially for operators undergoing training in Doppler appl ications. It would also identify poor practice where there is prolonged exp osure at high output levels. Such a display in combination with accurate ou tput measurement from manufacturers and independent laboratories, would hel p to ensure the safe use of ultrasound in fetal assessment.