8-5
■
MI: the Mechanical index
Ispta.3: the derated spatial-peak temporal-average intensity
Isppa.3: the derated spatial-peak pulse-average intensity
Pr.3: the derated peak rarefactional pressure
W0: 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 pulse repetition frequency
EBD: the entrance beam dimensions for the azimuthal and elevational planes
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