Full Digital Color Doppler Ultrasonic Diagnostic Instrument (Vet) User’s Manual V1.00
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to make it satisfy the area need to be measured, press
『
Measure
』
key to exchange the starting point
and end point; press
『
Set
』
key, the measured value is automatically displayed at the built-in characters
“Gmax: ” on the right side of the screen, histogram is displayed in the lower right of screen;
5. Repeat the steps 3, 4 to measure for several times.
13.1.6 Profile measurement
Function: measures the grey distribution of ultrasonic echo signals on a cross-section in a horizontal or
vertical direction, and indicates with profile. Profile is only measured on the frozen image.
1. Freeze a valuable image;
2. Move the cursor to the
〖
Profile
〗
menu item in
【
B Meas
】
menu, press
『
Set
』
key;
3. Operate the trackball or the direction keys to move the “+” mark to the desired position, press
『
Set
』
key and make the “+”position as the starting point of the measurement;
4. Operate the trackball or the direction keys to move the “+” mark to end point of the measurement, at
the same time a dashed line appears between two measured marks, press
『
Measure
』
key to exchange
the starting point and end point; press
『
Set
』
key, the measured values are automatically displayed at
the built-in characters “Gmax: Gmin: Gmean: ” on the right side of the screen, at the same time
profile is displayed in the image area;
5. Repeat the steps 3, 4 to measure for several times.
13.1.7 Stenosis ratio measurement
Function: measures and calculates the stenosis degree of the blood vessel. There are two kinds of
stenosis ratio, one is distance stenosis ratio the other is area stenosis ratio. Both are calculated according to
the distance and area.
Formulas:
Distance stenosis ratio: %D= [(D1-D2)/D1] * 100%
Area stenosis ratio: %A= [(A1-A2)/A1] * 100%
Where, D1 is the distance at the non-stenosis position; A1 is the area at the non-stenosis position. D2
and A2 are separately the distance and area at the stenosis position.
A. Distance Stenosis Ratio
1. Move the cursor to the
〖
DSR
〗
submenu of
〖
% Stenosis
〗
in
【
B Meas
】
menu, press
『
Set
』
key;
2. Measure the distance D1 at the non-stenosis position, the method sees “Distance” measurement;
3. Measure the distance D2 at the stenosis position, the method sees “Distance” measurement. After
finish the measurement, the calculated value will be shown on the right of the shown area;
4. Repeat the steps 2, 3 to measure the next distance stenosis ratio.
B. Area Stenosis Ratio
1. Move the cursor to the
〖
ASR
〗
submenu of
〖
% Stenosis
〗
in
【
B Meas
】
menu, press
『
Set
』
key;
2. Measure the area A1 at the non-stenosis position, the method sees “Cir/Area” of the “Ellipse”;
3. Measure the area A2 at the stenosis position and the method sees “Cir/Area” of the “Ellipse”. After
finish the measurement, the calculated value will be shown on the right of the shown area;
4. Repeat the steps 2, 3 to measure the next area stenosis ratio.
13.1.8 Ratio measurement
Function: measures and calculates the ratio of two distances, the first measured value as the numerator,
the second measured value as the denominator.
1. Move the cursor to
〖
Ratio
〗
menu item in
【
B Meas
】
menu, press
『
Set
』
key, the cursor shows “+”;
2. Measure the first the distance, the method sees “Distance” measurement;
3. Measure the second the distance, the method sees “Distance” measurement, the ratio value is real
time shown on the right of the screen;
4.Repeat steps 2 and 3 to start a new ratio measurement.