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Chapter 8 Measurements and Calculations
Accel
This is a basic measurement that is only available in Spectral Doppler mode. Specify two points
on a Spectral Doppler image and measure the velocity at each point to calculate the time and
acceleration.
1. Select Accel on the monitor or touch screen.
2. Specify two points and measure the length of the straight line between the points. This
measurement is taken in the same way as ‘Distance’.
3. When the measurement has been taken, the result is shown on the screen.
The following equation is used for Accel measurement:
X
RI
This is a basic measurement that is only available in Spectral Doppler mode. Specify two points on
a Spectral Doppler image and measure the velocity at each point to calculate the Resistivity Index
(RI).
1. Tap RI on the touch screen.
2. Specify two points on a Spectral Doppler image, and measure the velocity at each point.
3. When the measurement has been taken, the result is shown on the screen.
The equations used for D RI measurement are as follows:
X
h