7-2 Measurement
Measurement Tools
Function
Volume
The volume of a target.
Double Dist
Measures the length of two line segments, which are perpendicular to
each other.
Parallel
The distance between each pair of parallel lines in a sequence.
Trace Length
Measures the length of a curve on the image.
Distance Ratio
Measures the lengths of any two line segments and the calculated
ratio.
Area Ratio
The areas of any two regions and the calculated ratio.
B histogram
The grayscale distribution of ultrasonic echo signals in a closed
region.
B profile
The grayscale distribution of ultrasonic echo signals across a line.
Color Velocity
Color flow velocity (only valid for Color mode).
Volume Flow
Blood flow through some vascular cross section per unit time.
7.2.2
M General Measurements
M general measurements refer to general measurements on M mode. The measurements
listed below can be performed:
Measurement
Tools
Function
Distance
The vertical distance between two points.
Time
The time interval between any two points.
Slope
Measures the distance and time between two points and calculates the
slope.
HR
Measures the time of n (n
≤
8) cardiac cycles and calculates the heart rate in
M mode image.
Velocity
Calculates the average velocity by measuring the distance and time
between two points.
7.2.3
Doppler General Measurements
Doppler general measurements refer to general measurements on PW-mode images. The
measurements listed below can be performed:
Measurement
Tools
Function
Time
The time interval between any two points.
HR
N intervals (n
≤
8) are measured to calculate a PW mode derived HR
value in Beats Per Minute (BPM).
D Velocity
On the Doppler mode image, velocity and PG (pressure gradient) of a
point on the Doppler spectrum waveform are measured.
Acceleration
Velocity and time interval between two points are measured to calculate
speed difference and acceleration.
D Trace
On the PW mode image, one or several Doppler waveforms are traced
to obtain speed and PG, etc.
