Samsung SA8000 SE Manual do Utilizador descarregar pdf (Página 12)

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Measurement in Spectral Doppler Mode

NOTE

Since a Spectral Doppler Image is displayed with time (X axis) and speed (Y

axis), setting one point above the image will allow the speed to be checked.

The distance measurement method in Spectral Doppler Mode is the same as that in 2D Mode.

▐ Doppler Velocity: measures acceleration using the distance between

two points

The speed (cm/s or mm/s), RI (Resistivity Index), speed ratio (V1/V2), speed change (dV:

cm/s or mm/s) at each point, time interval (sec) and acceleration speed between two

points (Acc: cm/s

or mm/s

)

are displayed.

A maximum of four sets of measurements can be simultaneously displayed. The following

shows the measurement formulas and methods.

−

VVdV −=

onAccelerati =

−

)(

1. Press the Caliper button, and the ‘Doppler Velocity’ item appears on the left side of

the screen.

2. Set two points using the cursor and measure the distance between them. For

information about distance measurement, refer to ‘2D Distance (Line) Measurement’

in this chapter.

3. After position setup, the measurement result is shown on the screen.

4. A new cursor appears for a new measurement.

▐ Doppler Velocity (A/B): measures speed ratio between two points

The speed (cm/s or mm/s), the RI (Resistivity Index) at each point and the speed ratio

(A/B) of the two points are displayed.

A maximum of four sets of measurements can be displayed simultaneously. The following

shows the measurement formula and methods.

1. Press the Caliper button, and the currently selected item appears on the left side of

the screen.

2. Select ‘Doppler Velocity (A/B)’ by pressing Flexible Soft button [1] Distance or by

pressing Change or Caliper button several times.

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Samsung SA8000 SE Manual do Utilizador Página 12