Mindray Ana, Руководство оператора

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6 Image Acquisition
Operator’s Manual 6 - 23
6.12 Smart VTI
Smart VTI (Velocity-Time Integral) is used to calculate the CO (cardiac output) of the LVOT (left
ventricular output tract), so as to quickly evaluate the cardiac function.
TIP:
• The cardiac package should be configured in advance.
• Smart VTI is an option.
• Smart VTI supports B mode image calculation in real time.
Perform the following procedure:
1.
Select a phased probe and “Adult Cardiac” exam mode.
2. Move the probe to capture an appropriate image of the long axis view of the left ventricular
near the sternum.
3. Press the <Measure> key to enter the application measurement. Select the “LVOT Diam” item
and the measurement cursor is displayed on the main screen.
a. Move the cursor to the starting point.
b. Press <Set> to set the starting point.
c. Move the cursor to the end point.
Press <Clear> to cancel setting the starting point for measurement and <Update> to
switch the active end and fixed end of the caliper.
d. Press <Set> to set the end point.
For more information about measurement, see Advanced Volume .
4. Press the <Freeze> key to unfreeze the image. Move the probe to capture an appropriate image
of the apical five chamber view.
5. Tap [Smart VTI] on the touch screen or the user-defined key to enter the Smart VTI mode.
The system will:
– Automatically trace the color VOI, and PW sampling line and sampling volume.
– Automatically recognize the cardiac cycle: when there are ECG inputs, the ECG signals
are preferred; when there are no ECG signals, the system automatically starts calculation.
– Trace the LVOT spectrum in a cardiac cycle in real time to gain the VTI, HR, and CO
results of the LVOT.
6. If necessary, adjust the color VOI, and PW sampling line and sampling volume:
– Use the trackball/trackpad and <Set> keys to adjust the color VOI position and size, and
the PW sampling line position.
– Tap the PW tab to enter the PW mode, and adjust the PW sampling volume.