Chapter 1 Safety 1 - 35
▐Acoustic Output and Measurement
The terms and symbols used in the acoustic output tables are defined in the following paragraphs.
ISPTA.3 The derated spatial-peak temporal-average intensity (Milliwatts per square centimeter).
ISPPA.3 The derated spatial-peak pulse-average intensity(watts per square centimeter). The
value of IPA.3 at the position of global maximum MI (IPA.3@MI) may be reported instead
of ISPPA.3 if the global maximum MI is reported.
MI
The Mechanical Index. The value of MI at the position of ISPPA.3, (MI@ISPPA.3) may be
reported instead of MI (global maximum value) if ISPPA.3 is 190W/cm
2
.
Pr.3
The derated peak rarefactional pressure (megapascals) associated with the transmit
pattern giving rise to the reported MI value.
WO Ultrasonic power (milliwatts). For the operating condition giving rise to ISPTA.3, WO is
the total time-average power; For operating conditions subject to reporting under ISPPA.3,
WO is the ultrasonic power associated with the transmit pattern, giving rise to the value
reported under ISPPA.3.
Fc
Center frequency (MHz). For MI and ISPPA.3, Fc is the center frequency associated
with the transmit pattern, giving rise to the global maximum value of the respective
parameter. For ISPTA.3, for combined modes involving beam types of unequal center
frequency, Fc is defined as the overall ranges of center frequencies of the respective
transmit patterns.
ZSP The axial distance at which the reported parameter is measured (centimeters).
x-6,y-6 These are respectively the in-plane (azimuth) and out-of-plane (elevation) -6 dimensions in
the x-y plane where ZSP is found (centimeters).
PD
The pulse duration (microseconds) associated with the transmit pattern, giving rise to the
reported value of the respective parameter.
PRF The pulse repetition frequency (Hz) associated with the transmit pattern, giving rise to
the reported value of the respective parameter.
EBD
The entrance beam dimensions for the azimuth and elevation planes (centimeters).
EDS The entrance dimensions of the scan for the azimuth and elevation planes (centimeters).
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