8-4
MI : the Mechanical index
Ispta3 : the derated spatial-peak temporal-average intensity.
Isppa3 : the derated spatial-peak pulse-average intensity.
pr.3 : the deratad peak rarefactional pressure.
Wo : the ultrasonic power
fc : the center frequency
Zsp : the axial distance at which the reported parameter is
measured.
x-6, y-6 : are respectively the in-plane(azimuthal) and out of
plane (elevational) -6dB dimensions in the x-y plane
where Zsp is found
PD : the pulse duration
PRF : the puls repetition frequency
EBD : the entrance beam dimensions for the azimuthal and
elevational planes
Acoustic Output Report (IEC60601-2-37)