Terminology In Acoustic Output Tables - FujiFilm SonoSite X-Porte User Manual

Terminology in acoustic output tables

A
Area of the active aperture measured in cm
aprt
d (z) Equivalent beam diameter as a function of axial distance z, and is equal to
eq
 
4
z in centimeters.
d @PII Equivalent beam diameter at the point where the free-field, spatial-peak pulse
eq max
intensity integral is a maximum in centimeters.
Dim. of A Active aperture dimensions for the azimuthal (x) and elevational (y) planes in
aprt
centimeters.
fc Center frequency in MHz.
FL Focal length, or azimuthal (x) and elevational (y) lengths, if different measured in
centimeters.
I @
Derated pulse average intensity at the maximum MI in units of W/cm
pa.3 MImax
I
Derated spatial peak, temporal average intensity in units of milliwatts/cm
SPTA.3
I z Derated spatial-peak temporal-average intensity at axial distance z
SPTA.3 1
square centimeter).
MI Mechanical index.
PD Pulse duration (microseconds) associated with the transmit pattern giving rise to the
reported value of MI.
P Derated peak rarefactional pressure associated with the transmit pattern giving rise to
r.3
the value reported under MI (Megapascals).
p @PII Peak rarefactional pressure at the point where the free-field, spatial-peak pulse
r max
intensity integral is a maximum in Megapascals.
PRF Pulse repetition frequency associated with the transmit pattern giving rise to the
reported value of MI in Hertz.
TI type Applicable thermal index for the transducer, imaging mode, and exam type.
TI value Thermal index value for the transducer, imaging mode, and exam type.
TIB (Bone thermal index) is a thermal index for applications in which the ultrasound beam
passes through soft tissue and a focal region is in the immediate vicinity of bone. TIB
non-scan is the bone thermal index in the non-autoscanning mode.
TIC (Cranial bone thermal index) is the thermal index for applications in which the
ultrasound beam passes through bone near the beam entrance into the body.
10-70
    Wo      z    
, where I
I
TA
2
.
(z) is the temporal-average intensity as a function of
TA
2
.
2
.
(milliwatts per
1
Acoustic output