GE Logiq P5 User Manual

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-35
Direction 2300002-100 Rev. 2
% Stenosis 
In B-Mode, you can calculate % Stenosis by diameter or by 
area.
Diameter
NOTE:  When you use diameter to calculate the %stenosis, always take 
the measurement from a cross-sectional view of the vessel.
To calculate percent stenosis by diameter:
1. Select % Stenosis. 
2. Select %sten(Diam).
The system displays an active caliper.
3.  Make a distance measurement of the inner area of the blood 
vessel:
a.  To position the active caliper at the start point, move the 
Trackball.
b.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
c.  To position the second active caliper at the end point, 
move the Trackball.
A dotted line connects the measurement points.
d.  To complete the measurement, press Set.
The system displays the distance value in the Results 
Window and displays an active caliper for the second 
distance measurement.
4.  To make a distance measurement of the outer area of the 
blood vessel, repeat steps a–d. 
The system displays the % Stenosis in the Results Window.
NOTE:  For the diameter calculation, do NOT take a distance 
measurement from a longitudinal view. This may lead to an 
inaccurate assessment of % stenosis. 
						

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9-36 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
% Stenosis (continued)
AreaTo calculate percent stenosis by area:
1. Select % Stenosis. 
2. Select %sten(Area).
The system displays a trace caliper.
3.  Make a trace measurement of the inner area of the blood 
vessel:
a.  To position the trace caliper at the start point, move the 
Trackball.
b.  To fix the trace start point, press Set.
The trace caliper changes to an active caliper.
c.  To trace the measurement area, move the Trackball 
around the anatomy.
A dotted line shows the traced area.
NOTE:  To erase an open trace, move the Trackball.
d.  To complete the measurement, press Set.
The system displays a second trace caliper. 
4.  To make a trace measurement of the outer area of the blood 
vessel, repeat steps a–d.
The system displays the two area measurements and 
percent stenosis in the Results Window. 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-37
Direction 2300002-100 Rev. 2
Transverse Abdominal Diameter
To measure transverse abdominal diameter, make one distance 
measurement:
1. Select TA D; an active caliper displays.
2.  To position the active caliper at the start point, move the 
Trackball.
3.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
4.  To position the second active caliper at the end point, move 
the Trackball.
A dotted line connects the measurement points.
5.  To complete the measurement, press Set.
The system displays the transverse abdominal diameter in 
the Results Window.
Transverse Cerebellar Diameter
To measure transverse cerebellar diameter, make one distance 
measurement:
1. Select TCD; an active caliper displays.
2.  To position the active caliper at the start point, move the 
Trackball.
3.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
4.  To position the second active caliper at the end point, move 
the Trackball.
A dotted line connects the measurement points.
5.  To complete the measurement, press Set.
The system displays the transverse cerebellar diameter in 
the Results Window.
USAEuropeTokyoOsakaASUM
USAEuropeTokyoOsakaASUM 
						

							OB/GYN
9-38 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Thorax Transverse Diameter
To measure thorax transverse diameter, make one distance 
measurement:
1. Select ThD; an active caliper displays.
2.  To position the active caliper at the start point, move the 
Trackball.
3.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
4.  To position the second active caliper at the end point, move 
the Trackball.
A dotted line connects the measurement points.
5.  To complete the measurement, press Set.
The system displays the thorax transverse diameter in the 
Results Window.USAEuropeTokyoOsakaASUM 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-39
Direction 2300002-100 Rev. 2
Tibia Length
To measure tibia length, make one distance measurement:
1. Select Tibia; an active caliper displays.
2.  To position the active caliper at the start point, move the 
Trackball.
3.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
4.  To position the second active caliper at the end point, move 
the Trackball.
A dotted line connects the measurement points.
5.  To complete the measurement, press Set.
The system displays the tibia length in the Results Window.
Ulna Length
To measure ulna length, make one distance measurement:
1. Select Ulna; an active caliper displays.
2.  To position the active caliper at the start point, move the 
Trackball.
3.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
4.  To position the second active caliper at the end point, move 
the Trackball.
A dotted line connects the measurement points.
5.  To complete the measurement, press Set.
The system displays the ulna length in the Results Window.
USAEuropeTokyoOsakaASUM
USAEuropeTokyoOsakaASUM 
						

							OB/GYN
9-40 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Vo l u m e
The system can make a volume calculation from any of the 
following measurements: 
• One distance
• Two distances
• Three distances
To make a volume calculation using one or two distances: 
1. Select Volume.
2.  Make one or two distance measurements:
a.  To position the active caliper at the start point, move the 
Trackball.
b.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
c.  To position the second active caliper at the end point, 
move the Trackball.
A dotted line connects the measurement points.
d.  To complete the measurement, press Set.
The system displays the distance value in the Results 
Window and displays an active caliper for the next 
distance measurement.
3.  Do one of the following:
•  To complete the volume calculation with one distance 
measurement, select Vol ume.
•  To complete the volume calculation with two distance 
measurements, repeat steps a–d, then select Volume.
4. Press Clear.
The system displays the distances and the volume in the 
Results Window. 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-41
Direction 2300002-100 Rev. 2
Volume (continued)
To make a volume calculation using three distances:
NOTE:  Three distances should be done in the dual format mode (side 
by side images). One measurement is usually made in the 
sagittal plane and two measurements in the axial plane. To use 
the dual format mode, press the L or R key on front panel.
1. Select Volume; an active caliper displays.
2.  Make the first distance measurement:
a.  To position the active caliper at the start point, move the 
Trackball.
b.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
c.  To position the second active caliper at the end point, 
move the Trackball.
A dotted line connects the measurement points.
d.  To complete the measurement, press Set.
The system displays the distance value in the Results 
Window and displays an active caliper.
3.  To make the second and third distance measurements, 
repeat steps a–d.
The system displays the distances and the volume in the 
Results Window. 
						

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9-42 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
M-Mode Measurements
In M-Mode you can measure % stenosis, A/B ratio, and heart 
rate.
% Stenosis 
In M-Mode, you measure % Stenosis by diameter.
NOTE:  Always take the measurement from a cross-sectional view of the 
vessel.
1. Select % Stenosis. 
The system displays an active caliper.
2.  Make a distance measurement of the inner area of the blood 
vessel:
a.  To position the active caliper at the start point, move the 
Trackball.
b.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
c.  To position the second active caliper at the end point, 
move the Trackball.
A dotted line connects the measurement points.
d.  To complete the measurement, press Set.
The system displays the distance value in the Results 
Window and displays an active caliper for the second 
distance measurement.
3.  To make a distance measurement of the outer area of the 
blood vessel, repeat steps a–d. 
The system displays each distance measurement and the  
% Stenosis in the Results Window.
NOTE:  For the diameter calculation, do NOT take a distance 
measurement from a longitudinal view. This may lead to an 
inaccurate assessment of % stenosis. 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-43
Direction 2300002-100 Rev. 2
A/B Ratio
In M-Mode you can measure A/B ratio by diameter, time, or 
velocity.
DiameterTo calculate A/B ratio by diameter:
1. Select A/B Ratio. 
2. Select ratio(Diam). 
The system displays an active caliper.
3.  Make a distance measurement of the first velocity.
a.  To position the active caliper at the start point, move the 
Trackball.
b.  To fix the start point, press Set.
The system fixes the first caliper and displays a second 
active caliper.
c.  To position the second active caliper at the end point, 
move the Trackball.
A dotted line connects the measurement points.
d.  To complete the measurement, press Set.
The system displays the distance value in the Results 
Window and displays an active caliper for the second 
distance measurement.
4.  To make a distance measurement of the second velocity, 
repeat steps a–d. 
						

							OB/GYN
9-44 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
A/B Ratio (continued)
TimeTo calculate A/B ratio by time:
1. Select A/B. 
2. Select ratio(Time). 
The system displays an active caliper.
3.  To position the caliper at the A point, move the Trackball.
4.  To fix the measure point, press Set.
The system displays a second active caliper.
5.  To position the second caliper at the B point, move the 
Trackball.
6.  To complete the measurement, press Set.
The system displays the two time measurements and the  A/
B ratio in the Results Window. 
Ve l o c i tyTo calculate AB ratio by velocity:
1. Select A/B. 
2. Select ratio(Velocity). 
The system displays an active caliper with vertical and 
horizontal dotted lines.
3.  To position the caliper at the A velocity, move the Trackball.
4.  To fix the measure point, press Set.
The system displays a second active caliper.
5.  To position the second caliper at the B velocity, move the 
Trackball.
6.  To complete the measurement, press Set.
The system displays the two velocity measurements and the 
A/B ratio in the Results Window.