1 - 30 HS70A Service Manual
values.
Power
Power controls the system acoustic output. Two real-time output values are on the screen: a TI
and an MI. They change as the system responds to POWER adjustments.
In combined modes, such as simultaneous Color, 2D-mode and pulsed Doppler, the individual
modes each add to the total TI. One mode will be the dominant contributor to this total. The
displayed MI will be from the mode with the largest peak pressure.
▐2D-mode Controls
2D-Mode Size
Narrowing the sector angle may increase the frame rate. This action will increase the TI. Pulse
voltage may be automatically adjusted down via software controls to keep the TI below the
system maximums. A decrease in pulse voltage will decrease the MI.
Zoom
Increasing the zoom magnification may increase the frame rate. This action will increase the TI.
The number of focal zones may also increase automatically to improve resolution. This action
may change the MI, since the peak intensity can occur at a different depth.
Persistence
A lower persistence will decrease the TI. Pulse voltage may be automatically increased. An
increase in pulse voltage will increase the MI.
Focal no.
More focal zones may change both the TI and MI by changing the frame rate or focal depth
automatically. Lower frame rates decrease the TI. The MI displayed will correspond to the zone
with the largest peak intensity.
Focus
Changing the focal depth will change the MI. Generally, higher MI values will occur when the focal
depth is near the natural focus of the transducer.
To Next Page
Loading...