Image Modes
10-14
Focus Position
This feature is used to adjust the color focus position relative to the B focus.
z Click [Focus Position] item in the menu.
z Select among 0% through 100% in increments of 10%.
z When the position is changed, the transmit focusing delay changes accordingly.
10.3.4 Power / DirPower Mode
Fundamental Power Mode is a non-directionally display of blood flow in the form of
intensity as opposed to flow velocity.
DirPower (Directional Power Mode) provides the additional information of flow direction
towards or away from the transducer.
The adjustable parameters of Power Mode are consistent with those of the Color Mode. In
addition, Dynamic Rang adjusts the contrast resolution of the Power Mode image by
compressing or expanding the range of display, and press the soft menu controls to select
[Dynamic Range] among 10 and 70 in increments of 5.
Refer to relevant section of the Color Mode and B Mode. The following is to introduce the
special items of the Power Mode.
Map (Power Map / DirPower Map)
The maps in the Power soft menu are grouped into two categories: Power maps and
Directional Power maps. There are four fundamental Power maps and four DirPower
maps. The Power maps provide information of flow intensity; the Directional Power maps
provides intensity and flow direction.
z Click [Map] item in the menu.
z Select among the values.
LVR (Low Velocity Rejection)
The Low Velocity Rejection function is to filter degrees of low velocity flow. Increase or
decrease the LVR threshold setting through [LVR] in the Power Mode menu. The bigger
the value, the higher the velocity rejected.
z Click [LVR] in the menu.
z Select among 1 through 9.
z Select [Off] to turn on or off this feature.
10.3.5 PW/CW Doppler Mode
PW (Pulsed Wave Doppler) mode or CW (Continuous Wave Doppler) mode is used to
provide blood flow velocity and direction utilizing a real-time spectral display. The
horizontal axis represents time, while the vertical axis represents Doppler frequency shift.
If the angle between beam and flow is known, the frequency shift can be converted to flow
speed and volume.
Most of the menu items are the same for the PW menu and CW menu, so the PW menu
and CW menu are combined together to be introduced here. However, note that
adjustment items, such as iTouch, SV, steer, Duplex, Triplex and HPRF, are not available
in the CW mode.
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