Image Modes
10-12
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.
iTouch
After you press the [iTouch] key on the control panel, the system will automatically set the PW
baseline and PRF value to the optimum settings according to the current scanned tissue
characteristics.
To preset the one-key optimization:
z Press [Setup] key on the control panel to show the [Setup] menu.
z Click [Image Preset] item to open the [Image Preset] screen.
z Click [PW] tab to open the [PW] page.
z Select [iTouch Ratio] among ratio values in the drop-down list on the right box.
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