The Physics of Ultrasound Energy Sources - Physics of Thermal Therapy - page 88

a Fourier transform of an acoustic pulse to analyze the funda-
mental frequency peak. More details of this and the more com-
plex measurements for TIB and TIC are given in AIUM (1992).
Using Equation 5.21, the MI can easily be calculated. Pressures
measured at increasing distance from the transducer are first
derated, as the peak of the rarefactional pressure in a medium
may differ slightly in position from the free field peak. The new
peak value is then entered into the equation along with the cen-
ter frequency of the acoustic wave, calculated as described previ-
ously. These values may be of interest to users making detailed
output measurements or comparing aspects of safety between
devices, however, they are not used for routine QA.

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