also increase automatically to improve resolution. This action may change
the MI, because the peak MI can occur at a different depth.
• Number of Focal Zones: More focal zones may change both the TI and
MI by changing frame rate or focal depth automatically. Lower frame rates
decrease the TI. MI displayed will correspond to the zone with the largest
MI value.
• 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
• Color Opt: Increasing the color sensitivity with the color 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 change little, if at all. If PW
Doppler is also enabled, then PW Doppler will remain the dominant mode
and the TI change will be small.
57
iE33 User Manual
4535 616 23901
2
Safety
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