User's Manual

Table Of Contents
InnoSight Ultrasound System
Appendix D: Acoustic Output Reporting Tables for Track 3 
12 Appendix
140
P6992-4, EN, 16/12/6
P
:
Output power
is the time-average power radiated by an ultrasonic transducer into an approximately free
field under specified conditions in a specified medium, preferably water
P
:
Attenuated output power
is the value of the acoustic
output power
after attenuation, at a specified
distance from the transducer, and given by
p
p
10
(

awf
/1)
p
i
:
Pulse-pressure-squared integral
is the time integral of the square of the instantaneous acoustic pressure
at a particular point in an acoustic field integrated over the acoustic pulse waveform
pii
:
Pulse-intensity integral
pii
:
Attenuated Pulse-intensity integral
p
r
:
Peak-rarefactional acoustic pressure
is the maximum of the modulus of the negative instantaneous
acoustic pressure in an acoustic field during an acoustic repetition period
p
r, 
:
Attenuated peak-rarefactional acoustic pressure
is the value of the
peak-rarefactional acoustic pressure
after attenuation, at a specified point, and given by
p
r, 
(
z
) 
p
r
(
z
)1
(

awf
/2)
prr
:
Pulse repetition rate
is the inverse of the time interval between two successive acoustic pulses
srr
:
Scan repetition rate
TI
:
Thermal index
is the ratio of attenuated acoustic power at a specified point to the attenuated acoustic
power required to raise the temperature at that point in a specific tissue model by 1C
TIB
:
Bone thermal index
is the thermal index for applications, such as fetal (second and third trimester) or
neonatal cephalic (through the fontanelle), in which the ultrasound beam passes through soft tissue, and a
focal region is in the immediate vicinity of bone
TIC
:
Cranial-bone thermal index
is the thermal index for applications, such as pediatric and adult-cranial
applications, in which the ultrasound beam passes through bone near the beam entrance into the body
TIS
:
Soft-tissue thermal index
is the
thermal index
related to soft tissues
t
d
:
Pulse duration
is 12 times the interval between the time when the time integral of intensity in an
acoustic pulse at a point reaches 1 and when it reaches 9 of the
pulse-intensity integral
X, Y
:
-12 dB output beam dimensions
are dimensions of the ultrasonic beam
(-12dB pulse beam width)
in
specified directions normal to the
beam alignment axis
and at the transducer output face
z
: Distance from the source to a specified point
z
b
: Depth for
TIB
z
bp
:
Break-point depth
is the value equal to 1 times the
equivalent aperture diameter
and given by
z
bp
1
D
eq
z
pii
:
Depth for peak pulse-intensity integral
z
MI
: Depth for
MI
z
pii, 
:
Depth for peak attenuated pulse-intensity integral
z
sii
:
Depth for peak sum of pulse-intensity integrals
z
sii, 
:
Depth for peak sum of attenuated pulse-intensity integrals
z
s
: Depth for
TIS