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Imaging Mode
The Main Menu Controls of DPDI Mode
Table 7-22: The Main Menu Controls of DPDI Mode
Parameter
Freq.
Scale
LVRej
BC SameWidth
Frame Rate
Angio
The Soft Menu Controls of DPDI Mode
Table 7-23: The Soft Menu Controls of DPDI Mode
Parameter
Invert
Priority
Persist
Lateral avg.
Radial avg.
Map
Power
Rev 1.00
Description
Adjusts the transmission frequency to control the sensitiv-
ity and the level of penetration. The selected frequency is
displayed in the status window. Adjusting Frequency may
affect Sample Volume and LVRej settings.
Adjusts the repetition rate of the Doppler pluses transmit-
ted when acquiring the data for color flow mapping. The
Scale (Nyquist limit) should be adjusted so that no aliasing
occurs, while still having good resolution of velocities. The
Nyquist limit should be somewhat above the maximum
velocity found in the data.
LVR, also called wall motion filter, adjusts the extent of low
velocity removal.
Adjusts the BC SameWidth setting so that the image width
of 2D Mode is the same as that of DPDI Mode.
Adjusts the Frame Rate.
Switch to Power Mode.
Description
Inverts the color scheme for positive and negative veloci-
ties. Invert is available in Live and Freeze.
Prioritize the blood flow image of DPDI Mode.
Improve the sensitivity of the signal in time domain.
Smooths the image by averaging collected horizontal
data. Increasing lateral averaging will reduce noise, but
may also reduce lateral resolution.
Smooths the image by averaging collected radial data.
Increasing radial averaging will reduce noise, but may also
reduce radial resolution.
Displays a menu of color map options. Each color map is
assigning different color hues for different velocities.
Controls the amount of acoustic power applied in all
modes. Acoustic power cannot be set above the amount
permitted by the FDA. The Thermal index (TI) and the
Mechanical index (MI) are displayed on the screen.
Chapter 7 - System Operation
141
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