2
HD11 XE Getting Started
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Safety
2D Controls
Sector Width
Narrowing the sector angle may increase frame rate. This action will increase the
TI. Pulser voltage may be automatically adjusted down with software controls to
keep the TI below the system maximums. A decrease in pulser voltage will
decrease MI.
Zoom
Increasing the zoom magnification by pressing Zoom may increase frame rate.
This action will increase the TI. The number of focal zones may also increase
automatically to improve resolution. This action may change MI since a different
focal zone may now produce the largest MI value.
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 corre-
spond 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 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 pulsed
Doppler is also enabled then pulsed 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 com-
bination of these effects. Generally, the TI will decrease with increased color sec-
tor depth. MI will correspond to the peak MI value of the dominant pulse type
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