dominant pulse type. The displayed MI will be from the mode with the
largest peak pressure.
• Sample Volume Depth: When Doppler sample volume depth is increased,
the Doppler PRF may automatically decrease. An increase in PRF will
increase the TI. The system may also automatically decrease the pulser
voltage to remain below the system maximum. A decrease in pulser voltage
will decrease MI.
Other Control Effects
• Imaging Mode Controls: When a new imaging mode is selected, both
the TI and MI may change to default settings. Each mode has a corresponding
pulse repetition frequency and maximum intensity point. In combined or
simultaneous modes, the TI is the sum of the contribution from the modes
enabled, and the displayed MI is the largest of the MI values associated with
each mode and focal zone enabled. The system will return to the previously
selected state if a mode is turned off and then reselected.
• Transducer: Each transducer type has unique specifications for contact
area, beam shape, and center frequency. Defaults are initialized when you
select a transducer. Factory defaults vary with transducer, application, and
selected mode. Defaults have been chosen below the FDA limits for intended
use.
• 2D Depth: An increase in 2D depth will automatically decrease the 2D
frame rate. This will decrease the TI. The system may also automatically
choose a deeper 2D focal depth. A change of focal depth may change the
MI. The MI displayed is that of the zone with the largest MI value.
• Application: Acoustic output defaults are set when you select an
application. Factory defaults vary with transducer, application, and mode.
Defaults have been chosen below the FDA limits for intended use.
iU22 User Manual
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Safety
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