GE Logiq P5 User Manual

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-15
Direction 2300002-100 Rev. 2
Amniotic Fluid Index (AFI)
To calculate the amniotic fluid index, you make measurements 
of the four quadrants of the uterine cavity. The system adds 
these four measurements together to calculate the Amniotic 
Fluid Index.
NOTE:  The four quadrants can be measured with distance (caliper) or 
circumference (circle) measurements. Press the appropraite AFI 
quadrant Touch Panel key to toggle between caliper and circle.
1. Select AFI. 
The first distance measurement, AFI-Q1, is already 
selected.
2.  Make a standard distance measurement for the first 
quadrant:
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.
3.  When the measurement of the first quadrant is completed, 
unfreeze and move to the second quadrant. 
4.  After you obtain the image, press Freeze and then 
Measure. 
The system prompts you to continue with the AFI 
measurements. USAEuropeTokyoOsakaASUM 
						

							OB/GYN
9-16 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Amniotic Fluid Index (AFI) (continued)
5.  Perform a standard distance measurement for the second, 
third, and fourth quadrants (see step 2).
When all four quadrants have been measured, the system 
calculates the AFI and displays it in the Results Window.
HINTS•  If you unfreeze the image after doing an AFI measurement, 
the system does not delete the previous measurements. 
Unfreeze and change scan planes as necessary.
•  To specify that an unassigned distance measurement be 
used for an AFI measurement:
• Select AFI.
• Press Measure.
• Move the Trackball to highlight the unassigned 
distance measurement in the Results Window.
•  Select the AFI measurement on the Touch Panel. 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-17
Direction 2300002-100 Rev. 2
Angle
This function measures the angle between two intersecting 
planes.
1. Select Angle. 
The system displays an active caliper. 
2.  To position the caliper, move the Trackball.
3.  To fix the position of the first caliper, press Set.
The system displays a second active caliper.
4.  To position the second caliper at the apex of the angle, 
move the Trackball.
5.  To fix the position of the second caliper, press Set.
The system displays a third active caliper. 
6.  To position the third caliper, move the Trackball. 
7.  To complete the angle measurement, press Set.
The system displays the angle in the Results Window. 
						

							OB/GYN
9-18 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Antero-Postero Trunk Diameter & Transverse Trunk Diameter (APTD-TTD)
Make two distance measurements, one of the antero-postero 
trunk diameter and one of the transverse trunk diameter. 
1. Select APTD_TTD; an active caliper displays.
2.  Make a distance measurement of the antero-postero trunk 
diameter:
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 a distance measurement of the transverse trunk 
diameter, repeat steps a–d above.
The system displays the antero-postero trunk diameter and 
the transverse trunk diameter in the Results Window.USAEuropeTokyoOsakaASUM 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-19
Direction 2300002-100 Rev. 2
Antero-PosteroTrunk Diameter by Transverse Trunk Diameter (AxT)
Make two distance measurements, one of the antero-postero 
trunk diameter and one of the transverse trunk diameter. 
1. Select AxT; an active caliper displays.
2.  Make a distance measurement of the antero-postero trunk 
diameter:
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 a distance measurement of the transverse trunk 
diameter, repeat steps a–d above.
The system displays the antero-postero trunk diameter, the 
transverse trunk diameter, and AxT in the Results Window.USAEuropeTokyoOsakaASUM 
						

							OB/GYN
9-20 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Biparietal Diameter
To measure biparietal diameter, make one distance 
measurement:
1. Select BPD; 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 biparietal diameter in the Results 
Window.
Crown Rump Length
To measure crown rump length, make one distance 
measurement:
1. Select CRL; 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 crown rump length in the Results 
Window.
USAEuropeTokyoOsakaASUM
USAEuropeTokyoOsakaASUM 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-21
Direction 2300002-100 Rev. 2
Cardio-Thoracic Area Ratio (CTAR)
To calculate cardio-thoracic area ratio, you make two ellipse 
measurements.
1. Select CTAR; an active caliper displays.
2.  Make an ellipse measurement of the cardiac area:
a.  To position the active caliper, 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 caliper, move the Trackball.
d. Adjust the Ellipse control; an ellipse with an initial circle 
shape displays.
•  To position the ellipse and to size the measured axes 
(move the calipers), move the Trackball.
•  To increase the size, adjust the Ellipse control in a 
clockwise direction. 
•  To decrease the size, adjust the Ellipse control in a 
counterclockwise direction.
•  To toggle between active calipers, press Measure.
e.  To complete the ellipse measurement, press Set.
The system displays the cardiac area measurement in 
the Results Window
3.  To make an ellipse measurement of the thoracic area, 
repeat steps a–e.
The system displays the cardio-thoracic area ratio in the 
Results Window.USAEuropeTokyoOsakaASUM 
						

							OB/GYN
9-22 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Estimated Fetal Weight (EFW)
To measure estimated fetal weight, you make several OB 
measurements. These measurements can vary, based on how 
your system is set up. Measurements can include biparietal 
diameter, fetal trunk area, femur length, antero-postero trunk 
diameter and transverse trunk diameter, abdominal 
circumference, head circumference and spinal length.
1. Select EFW.
The system displays the required measurements.
2. Make each measurement.
The system displays each measurement and the estimated 
fetal weight in the Results Window.
NOTE:  For a description of any of the required measurements, refer to 
that measurement. USAEuropeTokyoOsakaASUM 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-23
Direction 2300002-100 Rev. 2
Femur Length
To measure femur length, make one distance measurement:
1. Select FL; 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 femur length in the Results 
Window.USAEuropeTokyoOsakaASUM 
						

							OB/GYN
9-24 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Fetal Trunk Area (FTA)
To measure fetal trunk area, you make an ellipse, trace, or two 
distance measurements.
Ellipse1. Select FTA; an active caliper displays.
2.  To position the active caliper, 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 caliper, move the Trackball.
5. Adjust the Ellipse control; an ellipse with an initial circle 
shape displays.
•  To position the ellipse and to size the measured axes 
(move the calipers), move the Trackball.
•  To increase the size, adjust the Ellipse control in a 
clockwise direction. 
•  To decrease the size, adjust the Ellipse control in a 
counterclockwise direction.
•  To toggle between active calipers, press Measure.
6.  To complete the measurement, press Set.
The system displays the measurement in the Results 
Window.USAEuropeTokyoOsakaASUM
HINTSBefore you complete the ellipse measurement:
•  To erase the ellipse and the current data measured, press 
Clear once. The original caliper is displayed to restart the 
measurement.
•  To exit the measurement function without completing the 
measurement, press Clear a second time.