Quatech Audio/Video Capture USB 2.0 Spécifications télécharger pdf (Page 224)

9-22 z.one ultra and z.one ultra sp OPERATOR MANUAL

• Only a single PI measurement can be performed at any given time.

NOTE: In the DDB, Max velocity is identified as PSV (Peak Systolic Velocity) and

Min velocity is identified as MDV (Minimum Diastolic Velocity).

 To Measure Pulsatility Index (PI)

1. Freeze the display with a PW Doppler strip image.

2. Press the Measure button.

3. Highlight and select PI.

4. The first PW trace caliper will be displayed.

5. Use the Trackball to position the caliper to the desired location within the PW

Doppler strip display. There is no DDB display at this time.

6. Press the Set button to fix PW trace start point and activate the second

velocity caliper.

7. Use the Trackball to trace the desired portion of the waveform within the PW

Doppler strip display. There is no DDB display at this time.

8. To undo any portions of the trace:

9. Press the Set button to fix the trace end point and complete the PW trace and

activate the PSV velocity caliper. At this time, the DDB only displays the TA

max and the PSV velocity results. The system continuously updates the PSV

velocity result as the user positions the caliper within the strip image.

NOTE: When the trace is completed, a vertical line is dropped from the start and

end points of the trace to the baseline to clearly delineate the traced region used

for TA max.

NOTE: The PSV velocity caliper is automatically positioned at the maximum traced

velocity.

10. Use the Trackball to position the caliper to the desired location within the PW

Doppler strip display.

NOTE: If the absolute value of the MDV velocity result is greater than the current

PSV result, the MDV and PSV result displays are swapped and the caliper

becomes a PSV caliper. The converse is also true when the absolute value of the

PSV velocity result is less than the current MDV result.

NOTE: Pressing the Set button again toggles the active caliper selection between

the first and second velocity calipers, allowing positional corrections to be made to

both caliper instances within the strip image.

SmartCart

Press the Delete button

SmartCart sp

Press the Back/Delete button

Scan Engine

Press the Back button

SmartCart/SmartCart sp

Only updates the PSV velocity result as the user

positions the caliper within the strip image

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Quatech Audio/Video Capture USB 2.0 Spécifications Page 224