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...

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...

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...

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...

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...

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...

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,...

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...

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...

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...