• Focus: Changing the focal depth will change MI. Generally, higher MI values
will occur when the focal depth is near the natural focus of the transducer.
Color and Power Controls
• Flow Opt: Increasing the color sensitivity with the flow opt control may
increase the TI. More time is spent scanning the color image. Color pulses
are the dominant pulse type in this mode.
• Color Sector Width: Narrower color sector width will increase color
frame rate and the TI will increase. The system may automatically decrease
pulser voltage to stay below the system maximum. A decrease in pulser
voltage will decrease the MI. If PW Doppler is also enabled, then PW
Doppler will remain the dominant mode and the TI change will be small.
• Color Sector Depth: Deeper color sector depth may automatically
decrease color frame rate or select a new color focal zone or color pulse
length. The TI will change due to the combination of these effects. Generally,
the TI will decrease with increased color sector depth. MI will correspond
to the MI of the dominant pulse type which is a color pulse. However, if
PW Doppler is also enabled then PW Doppler will remain the dominant
mode and the TI change will be small.
• Scale: Using the scale control to increase the color velocity range may
increase the TI. The system may automatically adjust pulser voltage to stay
below the system maximums. A decrease in pulser voltage will also decrease
MI.
• Sector Width: A narrower 2D sector width in Color imaging will increase
color frame rate. The TI will increase. MI will not change. If PW Doppler
is also enabled, then PW Doppler will remain the dominant mode and the
TI change will be small.
M-Mode and Doppler Controls
• Simultaneous and Update Methods: Use of combination modes affects
both the TI and MI through the combination of pulse types. During
simultaneous mode, the TI is additive. During duplex, the TI will display the
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iU22 User Manual
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2
Safety
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