Signostics uscan - Page 49

P003948 Uscan User Manual Page | 47
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
I
SPTA.3
[mw/cm
2
]
TI type TI Value MI
I
PA.3
@MI
max
[W/cm
2
]
P004200 Output 5.69 TIS 0.09 0.823 143
P004200
Uncertainties ±9.2% ±9.2% ±4.6% ±9.2%
I
SPTA.3
Derated spatial peak, temporal average intensity (milliwatts/cm
2
)
TI Thermal index
MI Mechanical index
I
PA.3
@MI
max
Derated spatial-peak pulse-average intensity (watts/cm
2
)
Uncertainties are the cumulative e
ffect of measurement uncertainties.