Acoustic Measurement Precision And Uncertainty - FujiFilm SonoSite Edge II User Manual

Term Definition
deq(z) Equivalent beam diameter as a function of axial distance z, and is equal to

4
z in centimeters.
fc Center frequency in MHz.
Dim. of Aaprt Active aperture dimensions for the azimuthal (x) and elevational (y) planes in
centimeters.
PD Pulse duration (microseconds) associated with the transmit pattern giving rise to the
reported value of MI.
PRF Pulse repetition frequency associated with the transmit pattern giving rise to the
reported value of MI in Hertz.
p @PIImax Peak rarefactional pressure at the point where the free-field, spatial-peak pulse
r
intensity integral is a maximum in Megapascals.
deq@PIImax Equivalent beam diameter at the point where the free-field, spatial-peak pulse intensity
integral is a maximum in centimeters.
FL Focal length, or azimuthal (x) and elevational (y) lengths, if different measured in
centimeters.

Acoustic measurement precision and uncertainty

All table entries have been obtained at the same operating conditions that give rise to the maximum index
value in the first column of the table. Measurement precision and uncertainty for power, pressure, intensity,
and other quantities that are used to derive the values in the acoustic output table are shown in the table
below. In accordance with Section 6.4 of the Output Display Standard, the following measurement precision
and uncertainty values are determined by making repeat measurements and stating the standard deviation
as a percentage.
Quantity
Pr
Pr
.3
Wo
fc
PII
234
     Wo      z    
, where I
I
TA
Precision (% of standard deviation)
1.9%
1.9%
3.4%
0.1%
3.2%
(z) is the temporal-average intensity as a function of
TA
Uncertainty (95% confidence)
+11.2%
+12.2%
+10%
+4.7%
+12.5 to -16.8%
Acoustic output tables