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features of the ultrasound signal, the scanning structures and the features of the tissues and
liquid. You can
follow the methods below to decrease the errors as little as possible.
Select the probe in accordance with the depth range of the tissue to be measured.
Adopt the higher image magnification during the measurement.
Select the appropriate imaging mode and optimize the image quality.
The following measurement errors should be considered during the measurements. The measurement
accuracy is only valid in the range shown as below.
Error of distance measurement: within ±5%
Error of depth measurement: within ±5%
Error of time measurement: within ±5%
Error of sweep (slope) measurement: within ±15%
Error of area measurement: within ±8%
Error of circumference measurement: within ±4%
You should make a diagnosis with a clinical analysis and the measurement results together.
8.4 General Measurement
The measurement results of the general measurements are not recorded in the measurement report,
but
all the specific measurements are based on the general measurements.
General measurements can be performed in the B mode, M mode, Color/PDI mode and PW mode.
And the operations of Color/PDI mode and the B mode measurements are similar. These two modes are
called 2D mode hereafter.
8.4.1 2D Mode Measurements
8.4.1.1 Distance
It is used to measure the distance between two points on the image.
Steps:
1.
Press the Caliper key on the control panel to activate the measurement, and the measurement menu
displays on the top left of the screen.
2.
Select [Distance] on the menu by moving the trackball and press Set to confirm. A marker displays on the
image.
3.
Move the marker to the starting point by using the trackball, press Set to fix the marker and the second
marker displays.You can also press Update on the control panel and move the trackball to adjust the starting
point.
4.
Move the second marker to the end point by using the trackball and press Set. A line connects the two
points, and the measurement result displays in the result box.
5.
If necessary, you can repeat step 2-4 to perform the next distance measurement.
8.4.1.2 Area and Circumference
If the target object is similar with an ellipse, ellipse measurement can be performed to measure the
area
and circumference. If the target object is irregular, trace measurement can be performed to
measure the area and circumference.
Ellipse
It is used to measure the circumference and area of a blocked area on the image.