Quatech Audio/Video Capture USB 2.0 Specifikace stáhnout pdf (Strana 223)

z.one ultra and z.one ultra sp OPERATOR MANUAL 9-21

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 To Measure Resistive Index (RI)

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

2. Press the Measure button.

3. Highlight and select RI.

4. The PSV caliper will be displayed.

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

Doppler strip display. At this time, the DDB only displays the PSV velocity

result and updates the result as the user positions the caliper is positioned.

6. Press the Set button to fix the PSV velocity caliper and display the EDV

velocity caliper.

NOTE: The RI result is calculated and displayed once both velocity calipers have

been activated.

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

Doppler strip display. The DDB only displays the EDV velocity result and

updates the RI calculation result as the user positions the caliper within the

strip image.

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

PSV result, the EDV 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 EDV 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.

8. To successively erase trace dots:

9. Press the Measure button to remove the RI tools and exit Measure mode.

Pulsatility

Index

The Pulsatility Index (PI) is defined as (Max – Min)/TA Max, where Max and Min

are determined by comparing the absolute velocities obtained by two concurrent

PW Velocity calipers positioned within the context of the same PW Doppler strip.

• TA max is generated by tracing the peak outline of one complete Doppler

spectrum, which determines the average (mean) of the maximum

velocities.

SmartCart

Press Delete button

SmartCart sp

Press Back/Delete button

Scan Engine

Press Back button

SmartCart/SmartCart sp

Displays both Velocity results and their

associated RI calculation result in the DDB and

continuously updates them after completing the

PW trace when the user positions either caliper

within the PW Doppler strip image

1 2 ... 218 219 220 221 222 223 224 225 226 227 228 ... 403 404

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Quatech Audio/Video Capture USB 2.0 Specifikace Strana 223

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