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Safety and Care
Definition of Acoustic Terms
Term
Definition
ISPTA .3
Intensity, spatial-peak temporal average: The value of the temporal-
average intensity at the point in the acoustic field where the temporal-
average intensity is a maximum, or is a local maximum within a specified
region. Units: milliwatts/cm
TI
Thermal Index: A quantity related to calculated or estimated temperature
rise under certain defined assumptions. The thermal index is the ratio
of total acoustic power to the acoustic power required to raise tissue
temperature by 1º C under defined assumptions. C: Cranial. S: Soft
tissue. B: Bone.
MI
Mechanical Index: The spatial-peak value of the peak rarefactional
pressure, derated by 0.3 dB/cm-MHz at each point along the beam axis,
divided by the square root of the center frequency.
IPA .3@MImax
Intensity, pulse average at the maximum MI: The ratio of the pulse
intensity integral to the pulse duration at the maximum MI. Units W/cm
Acoustic Output Global Maximum Values: B-Mode
TRACK 3 Summary (for systems with no probes having global maximum index values
exceeding 1.0)
Transducer
Model
ISPTA.3
L8-3
3.58 mW/cm
L13-5
1.15 mW/cm
C5-2
4.53 mW/cm
Acoustic Output Global Maximum Values: Color Doppler
TRACK 3 Summary (for systems with no probes having global maximum index values
exceeding 1.0)
Transducer
Model
ISPTA.3
L8-3
33.02 mW/cm
L13-5
54.49 mW/cm
C5-2
19.09 mW/cm
2-14
.
2
TI Type
TI Value
TIC
0.09
2
TIS
0.02
2
TIC
0.15
2
TI Type
TI Value
TIC
0.72
2
TIC
0.86
2
TIC
0.88
2
MI
IPA.3@MImax
0.76
92.7 W/cm
2
0.33
31.74 W/cm
2
0.76
67.21 W/cm
2
MI
IPA.3@MImax
0.76
132.41 W/cm
2
0.38
86.44 W/cm
2
0.76
75.18 W/cm
2
.
2
Freestyle User Manual
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