Image Optimization 5-23
Arrow Size
Description Used for adjusting the arrow size.
Operation Rotate the knob under [Arrow Size] to adjust the parameter.
Impacts
The end point of the arrow does not change with the value becoming larger, but the
arrow length becomes longer.
The end point of the arrow does not change with the value becoming smaller, but the
arrow length becomes shorter.
Trig Type
Description Set trigger type.
Operation Under V Flow mode, turn on ECG and select “Manual” or “R” or “R100/200/300/400”
trigger mode. Image will be captured in 100/200/300/400ms after R wave and ECG
wave will be marked by red at that time.
Tap [Trig Type] to select the levels: manual, R, R100, R200, R300 and R400.
ROI Size
Description Adjust the size of ROI.
Operation Tap [ROI Size] on the touch screen to adjust.
Acquire Time
Description Set the acquisition time.
Operation Tap [Acquire Time] on the touch screen to adjust the acquisition time.
Sensitivity
Description This function is an indication of the ability to detect flow, which is used to adjust the
accuracy of color flow.
Operation Rotate the knob under the [Packet Size] item on the touch screen to adjust the value.
0 represents no packet size control and the bigger the value is, the higher the
sensitivity becomes.
The higher the sensitivity is, the more sensitive indication for low-velocity flow
becomes.
It affects the frame.
5.7 PW/CW Mode Optimization
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.
PW mode provides a function to examine flow at one specific site for its velocity, direction and features;
while CW mode proves to be much more sensitive to high velocity flow display. Thus, a combination of
both modes will contribute to a much more accurate analysis.
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