5-148 Image Optimization
3. 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 and press <Set> to set the starting point.
b. 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.
c. 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 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.
After adjustment, the LVOT spectrum tracing and calculation results display in real time.
7. Press the <Freeze> key to freeze the image, and check the Smart VTI calculation results.
If necessary, you can edit the LOVT spectrum manually:
a. Tap [Edit VTI] on the touch screen.
b. Press the <Cursor> key to activate the cursor.
c. Move the cursor to the spectrum tracing line and press the <Set> key.
d. Use the trackball to trace a line.
After tracing, the calculation results display in real time.
8. Tap [Save VTI] to save the Smart VTI calculation results of the current cardiac cycle to the report.
9. Tap [Graph] to check the quantitative index trend curve.
VTI, SV, and CO have different trend curves and are differentiated by colors. A maximum of 6 sets
of Smart VTI results can be saved and displayed.
10. Tap [Report], and select “Fluid Management” from the drop list box of [Report Type] to check report.
For details about report operation, refer to Advanced Volume.
5.23 Smart IVC
Smart IVC is used to automatically measure the IVC inner diameter and calculate the change rate in the
B mode image. Measure the IVC (Inferior Vena Cava) in real time, and the system automatically tracks
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