Philips EPIQ 7 User Manual page 64

Safety
NOTE
Per Section 6.4 of the Output Display Standard, measurement precision on the following
quantities is determined by making repeated measurements and stating the standard deviation
as a percentage.
Acoustic Measurement Precision
Quantity
Pr is the underated peak rarefactional pressure
measured in megapascals (MPa).
Wo is the ultrasonic power in milliwatts (mW).
f is the center frequency in megahertz (MHz)
c
(NEMA UD-2 definition).
PII.3 is the derated spatial-peak pulse intensity
integral in joules per square centimeter (J/cm
Acoustic Measurement Uncertainty
Quantity
Pr is the underated peak rarefactional pressure
measured in megapascals (MPa).
Wo is the ultrasonic power in milliwatts (mW).
f is the center frequency in megahertz (MHz)
c
(NEMA UD-2 definition).
PII.3 is the derated spatial-peak pulse intensity
integral in joules per square centimeter (J/cm
64
Precision (Percentage Standard
Deviation)
Pr: 5.4%
6.2%
<1%
P11.3: 3.2%
2 ).
Measurement Uncertainty
(Percentage, 95% Confidence Value)
Pr: ±11.3%
±10%
±4.7%
PII.3: +18% to -23%
).
2
Biological Safety
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