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M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 27
Safety: Transmit Power (Acoustical)
Tr a n s m i t
Power
(Acoustical)
Acoustic output, expressed as an index, is displayed on the screen to allow the best possible
diagnostic image with minimal power output. A display standard presents this index using one of
the following four power indices:
• Mechanical index (MI)
• Thermal index for soft tissue (TIS)
• Thermal index for bone (TIB)
• Thermal index for cranial bone (TIC)
The index setting on the System Setup menu selects the power index used. The displayed
index is based on this setting and on preset configuration and imaging mode.
NOTES
• The power index setting on the System Setup menu selects any of the four power indices
for display at any time.
• The Power rotary control at the right side of the system control panel is the only control
that affects transmit power level.
For additional information on acoustical power settings and power index, see the Philips Safety
and Standards Guide.
Acoustic
Exposure
Although no harmful effects have been demonstrated for any of the ultrasound frequencies,
intensities, and exposure times used in examinations with Philips ultrasound systems, Philips
recommends that you consider the following, and use the lowest ultrasound exposure that
produces diagnostically acceptable information:
• Use diagnostic ultrasound only when there is a good medical reason.
• Reset the controls at the start of every examination.