Q9 Digital Color Doppler Ultrasound System
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5.
Manual trace
Automatically measure the Peak Systolic Velocity, VTI, end diastolic velocity, HR, Time, minimum velocity, PI,
and RI after manually tracing of the curve is finished.
Note: Manual trace requires the user to trace two peak point of two cycles
6.
STD
Measure the diameter reduction ratio of vessel in B mode
1)
Move the cursor to the “STD” item and press Enter-key to select it .A cursor “+” will appear on the screen.
2)
Move the cursor to the point of outside wall of the vessel and press Enter key to fix it. The method to
measure the diameter of the outside wall of the vessel is the same as “distance” in genera measurement in B
mode
3)
When the diameter of outside wall of the vessel is finished,the cursor “+”will appear on the screen again.
Measure the diameter of the stenosis area;
4)
The value of every diameter and STD will be displayed in the result window.
7.
STA
Measure the area reduction ratio of vessel in B mode
1)
Move the cursor to the “STA” item and press Enter-key to select it .A cursor “+”will appear on the screen.
2)
Move the cursor to the point of outside wall of the vessel and press Enter-key to fix it. The method to
measure the area of the outside of the vessel is the same as “area-ellipse” in genera measurement in B mode
3)
When the area of outside of the vessel is finished , the cursor “+”will appear on the screen again. Measure
the area of the stenosis area;
4)
The value of every area and STD will be displayed in the result window.
8.
Area
The same as “area-trace” in general measurement in B mode.
9.
ICA/CCA
Measure ICA and CCA separately and get the ratio value of ICA/CCA
10.
Flow volume
<<Items to be measured>>
<<Items to be calculated>>
11.
Heart rate
The measurement is the same as “heart rate” in general measurement in M mode
Meas. item name
Description [Unit]
Meas. Method
Diam
Diameter of vessel [mm]
Refer to “distance” measurement
VTI
Velocity time integral
Refer to “area-trace” measurement
Time
Time
Refer to “time” measurement in M
mode
Calc. item name
Description [Unit]
Calc. formula
SV
Stroke volume[ml]
SV=
0.785 * diameter *
diameter *
∣
VTI
∣
CO
Cardiac output[L/min]
CO=SV*heart rate/1000
HR
Heart rate
Heart rate=60/time