Signostics uscan User Manual page 49

Given potential does exist for bio-effects with ultrasound exposure, any exposure should be kept As Low As
Reasonably Achievable. Scans should only be performed when there is a medical benefit and in the shortest
time commensurate with obtaining an adequate study. As the acoustic output of the device does not exceed an
MI or TI of 1.0, visual display of MI and TI values is not required. A generic ALARA education program is
supplied with your Uscan (see enclosed ISBN 1-93004 7-71-1, Medical Ultrasound Safety).
Table 8.4 Acoustic output and uncertainties for Uscan
P004200 Output
P004200 Uncertainties
I Derated spatial peak, temporal average intensity (milliwatts/cm
SPTA.3
TI Thermal index
MI Mechanical index
I @MI Derated spatial-peak pulse-average intensity (watts/cm
PA.3 max
Uncertainties are the cumulative effect of measurement uncertainties.
P003948
I
SPTA.3
TI type
2
[mw/cm ]
5.69 TIS
±9.2%
Uscan User Manual
TI Value MI
0.09 0.823
±9.2% ±4.6%
2
)
2
)
I @MI
PA.3 max
2
[W/cm ]
143
±9.2%
Page | 47