Measurements
13-3
13.2.2 General Measurements - M Mode
The measurements listed below can be performed in the M Mode:
Measurement tool Function
Distance The vertical distance between two points.
Time The time interval between any two points.
Slope The slope is calculated by means of measuring the distance and time
between two points.
Heart rate In the M heart beat image, n intervals (n≤8) are measured to calculate
an M Mode derived HR value in Beats Per Minute (BPM).
Velocity After the distance and time between two points are measured, the
average velocity can be calculated between the two points.
13.2.3 General Measurements - Doppler
General measurements in the D mode are also called “Doppler measurements.” The
measurement tools are as follows.
Measurement tool Function
Time The time interval between any two points.
Heart rate N intervals (n≤8) are measured to calculate a PW Mode derived HR
value in Beats Per Minute (BPM).
D Speed On the Doppler mode image, speed and PG (pressure gradient) of a
point on the Doppler spectrum waveform are measured.
Acceleration Speeds and time interval between two points are measured to
calculate speed difference and acceleration.
PS / ED Speed and PG between two peaks on the Doppler spectrum to
calculate RI (resistance index) and PS / ED (peak systolic / end
diastolic).
D Trace On the D mode image, one or several Doppler waveforms are traced
to obtain speed and PG, etc.
VF Diam To measure the vascular diameter.
Vol Flow(Diam) To measure the vascular diameter and max (average) velocity to
calculate the flow volume.
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