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ACUSON
Freestyle User Manual
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
2
.
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
2
.
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
TI Type
TI Value
MI
IPA.3@MImax
L8-3
3.58 mW/cm
2
TIC
0.09
0.76
92.7 W/cm
2
L13-5
1.15 mW/cm
2
TIS
0.02
0.33
31.74 W/cm
2
C5-2
4.53 mW/cm
2
TIC
0.15
0.76
67.21 W/cm
2
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
TI Type
TI Value
MI
IPA.3@MImax
L8-3
33.02 mW/cm
2
TIC
0.72
0.76
132.41 W/cm
2
L13-5
54.49 mW/cm
2
TIC
0.86
0.38
86.44 W/cm
2
C5-2
19.09 mW/cm
2
TIC
0.88
0.76
75.18 W/cm
2
Summary of Contents for ACUSON Freestyle
Page 4: ...iv ACUSON Freestyle User Manual ...
Page 14: ...1 2 ACUSON Freestyle User Manual Introduction ...
Page 70: ...3 2 ACUSON Freestyle User Manual Setup ...
Page 78: ...3 10 ACUSON Freestyle User Manual ...
Page 80: ...4 2 ACUSON Freestyle User Manual Patient Studies ...
Page 92: ...5 2 ACUSON Freestyle User Manual Scanning ...
Page 110: ...6 2 ACUSON Freestyle User Manual Wireless Probes ...
Page 122: ...7 2 ACUSON Freestyle User Manual Batteries ...
Page 128: ...8 2 ACUSON Freestyle User Manual Connectivity ...