VDO MG 2100 Specifications Page 328

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328 VisualSonics Vevo 2100 Imaging System Operator Manual Rev 1.1
Chapter 45: Acquiring Power Doppler Mode images
Transmit Power
Adjusts the power of the ultrasound signal transmission.
Turn clockwise to increase power. Turn counterclockwise to decrease power. Between
1% and 10% power the control adjusts power in increments of 1%. Between 10% to 100%
power the control adjusts in increments of 10%.
Line Density
Adjusts the resolution of your image by adjusting how many lines of image data the
transducer acquires over your image area. Push up to increase the line density. Pull
down to decrease.
The higher you set your line density, the lower the system sets the acquisition frame rate.
Because of this trade off, you might find that higher line density is most useful for
examining features in tissues that don't move very much such as liver, spleen, pancreas,
and prostrate.
For cardiology applications, you will tend to keep the line density lower so you can
increase the frame rate to measure more tissue movements over the time span of a
complete cardiac cycle.
Persist
Applies a pixel averaging algorithm to the most recently acquired frames to produce a
more uniform view of the faster moving areas in the image data.
To use this rocker switch control:
Push up or down to cycle through the persistence levels. In the bottom-left corner of the
screen the status bar briefly displays the name of the persistence label as you select.
Dynamic Range
Adjusts the input signal strength that is mapped into the spectral display. Range: 5-
100dB.
Push up to increase the range by 5dB and lower contrast. Higher dynamic ranges are
often used in cardiac imaging.
Pull down to decrease the range by 5dB and increase contrast. Lower dynamic ranges
are often used in abdominal imaging.
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