FujiFilm SONOSITE X-PORTE, User Manual

Page: 333 / 366

Acoustic output 10-71
TIS (Soft tissue thermal index) is a thermal index related to soft tissues. TIS scan is the soft
tissue thermal index in an auto-scanning mode. TIS non-scan is the soft tissue thermal
index in the non-autoscanning mode.
W
3
(z
1
) Derated ultrasonic power at axial distance z
1
in units of milliwatts.
Wo Ultrasonic power, except for TIS
scan
, in which case it is the ultrasonic power passing
through a one centimeter window in units of milliwatts.
z
1
Axial distance corresponding to the location of maximum min(W
3
(z
1
), I
TA.3
(z) x 1 cm
2
)],
where z ≥ zbp in centimeters.
z
bp
1.69 (A
apr t
) in centimeters.
z
sp
For MI, the axial distance at which p
r.3
is measured. For TIB, the axial distance at which
TIB is a global maximum (for example, z
sp
= z
b.3
) in centimeters.