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Safety
Application selection
Selecting the probe and application preset appropriate to a
particular ultrasound examination automatically provides
acoustic output limits within FDA guidelines for that application.
Other parameters which optimize performance for the selected
application are also set automatically, and should assist in
reducing the patient exposure time. See page 46, for
information on selecting probes and application presets.
Changing imaging modes
Acoustic output depends on the imaging mode selected. The
choice of mode (2D, M-Mode, Doppler or Color Flow)
determines whether the ultrasound beam is stationary or in
motion. This greatly affects the energy absorbed by the tissue.
See Chapter 3, "Scanning Modes" on page 75, for complete
information on changing imaging modes.
When operating in a combined mode, such as 2D and M-Mode,
the total acoustic output comprises contributions from each
individual mode. Depending on the modes in use, either or both
output indices may be affected.
The user can override the default settings, but care should be
taken to observe the displayed MI and TI values.
Power
It is possible to change the power in all operating modes so that
the operator can use the ALARA principle.
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Vivid i User's Manual
2378958-100 Rev. 02
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