GE Logiq P5 User Manual

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-45
Direction 2300002-100 Rev. 2
Heart Rate
To calculate the heart rate:
1.  From the Generic Touch Panel, select Heart Rate. 
The system displays an active caliper.
2.  To position the caliper at a recognizable point in the first 
cycle, move the Trackball.
3.  To fix the first caliper, press Set.
The system displays a second active caliper.
4.  To position the caliper at the identical point in the second or 
third cycle, move the Trackball.
 Figure 9-4. Two Heart Beat Reference
5.  To complete the measurement and transfer the calculation 
to the worksheet, press Set.
NOTE:  For information about how to specify the number of heart beats 
that the system will use, see the Basic User Manual, General 
Measurements and Calculation.  
						

							OB/GYN
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Direction 2300002-100 Rev. 2
Doppler Mode Measurements
You can use Doppler mode to study fetal blood flow in the heart, 
umbilical cord, placenta, and middle cerebral arteries. OB/GYN 
Doppler mode also allows you to study uterine and ovarian 
blood flow.
The OB/GYN vessel study includes the following vessels:
• Aorta
• Desc. Aorta
•  Middle Cerebral Artery (MCA) (right and left)
•  Ovarian (right and left)
• Placenta
• Umbilical
•  Uterine (right and left)
For each of these studies, you can make any of the following 
measurements:
•  Peak Systole (PS)
•  End Diastole (ED)
•  Mid Diastole (MD)
• Heart Rate
• TAMAX
• Pulsatility Index (PI)
•  Resistive Index (RI)
• PS/ED Ratio
• ED/PS Ratio
• Acceleration
• AT
• TAMEAN
• Volume Flow
• PV 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-47
Direction 2300002-100 Rev. 2
To select OB/GYN vessel measurements
OB/GYN Vessel measurements use the auto sequence feature. 
With this feature, when you select a folder for the vessel you 
want to measure, the system automatically starts the first 
measurement. It then continues with each of the other 
measurements in that study.
1.  Select the folder for the vessel you want to measure.
The system shows all the measurements for that vessel. 
The caliper for the first measurement is automatically 
displayed.
2.  Make the measurement.
After you complete each measurement, the system starts 
the next measurement. After the last measurement is 
complete, the system returns to the OB/GYN Vessel Touch 
Panel.
Your system is set up to show the measurements that you 
usually make for each vessel. To make a measurement that is 
not shown for the selected vessel:
1.  Select the folder for the vessel you want to measure.
2.  Select Show All.
The system display all possible vessel measurements.
3.  Select the desired measurement.
The following pages describe the steps to make each specific 
measurement in the OB/GYN Vessel study. 
						

							OB/GYN
9-48 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Acceleration
1. Select Accel. 
The system displays an active caliper with vertical and 
horizontal dotted lines.
2.  To position the caliper at the onset of systole, move the 
Trackball.
3.  To fix the measure point, press Set.
The system displays a second active caliper.
4.  To position the second caliper at early systolic peak, move 
the Trackball.
5.  To complete the measurement, press Set.
The system displays the acceleration time and acceleration 
in the Results Window.
Acceleration Time (AT)
1. Select AT. 
The system displays an active caliper and a vertical dotted 
line. 
2.  To position the caliper at the start point, move the Trackball.
3.  To fix the first caliper, press Set.
The system displays a second active caliper.
4.  To position the caliper at the end point, move the Trackball.
5.  To complete the measurement, press Set.
The system displays the acceleration time in the Results 
Window. 
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-49
Direction 2300002-100 Rev. 2
Heart Rate
This measurement is available in the Fetal Heart study and the 
OB/GYN Vessel study.
To calculate the heart rate:
1. Select Heart Rate. 
The system displays an active caliper and a vertical dotted 
line. 
2.  To position the caliper at a recognizable point in the first 
cycle, move the Trackball.
3.  To fix the first caliper, press Set.
The system displays a second active caliper.
4.  To position the caliper at the identical point in the second or 
third cycle, move the Trackball.
 Figure 9-5. Two Heart Beat Reference
5.  To complete the measurement and transfer the calculation 
to the worksheet, press Set. 
						

							OB/GYN
9-50 LOGIQ 5 Basic User Manual
Direction 2300002-100 Rev. 2
Peak Systole (PS), End Diastole (ED), or Mid Diastole (MD)
To calculate the peak systole, end diastole, or mid diastole:
1. Select PS, ED, or MD. 
The system displays an active caliper with vertical and 
horizontal dotted lines.
2.  To position the caliper at the measurement point, move the 
Trackball.
3.  To complete the measurement, press Set.
The system displays the peak systole, end diastole, or mid 
diastole in the Results Window. 
Pulsatility Index (PI)
1. Select PI. 
The system displays a trace caliper and a vertical dotted 
line.
2.  To position the caliper at the beginning of the waveform 
(PS), move the Trackball.
3.  To fix the start point, press Set.
The system displays a second active caliper.
4.  To trace the waveform from PS to ED, move the Trackball.
5.  To complete the measurement, press Set.
The system displays peak systole, mid diastole, end 
diastole, TAMAX, and the PI in the Results Window.  
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-51
Direction 2300002-100 Rev. 2
PS/ED or ED/PS Ratio
To calculate the Peak Systole/End Diastole ratio or End 
Diastole/Peak Systole ratio:
1. Select PS/ED or ED/PS. 
The system displays an active caliper with vertical and 
horizontal dotted lines.
2.  To position the caliper at peak systole (PS) or end diastole 
(ED), move the Trackball.
3.  To fix the measure point, press Set.
The system displays a second active caliper.
4.  To position the second caliper at end diastole (ED) or peak 
systole (PS), move the Trackball.
5.  To complete the measurement, press Set.
The system displays the peak systole, end diastole, and PS/
ED or ED/PS ratio in the Results Window. 
Resistive Index (RI)
1. Select RI. 
The system displays an active caliper with vertical and 
horizontal dotted lines.
2.  To position the caliper at the peak systolic velocity, move the 
Trackball.
3.  To fix the measure point, press Set.
The system displays a second active caliper.
4.  To position the second caliper at the end diastolic velocity, 
move the Trackball.
5.  To complete the measurement, press Set.
The system displays PS, ED, and RI in the Results Window.  
						

							OB/GYN
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Direction 2300002-100 Rev. 2
TA M A X
1. Select TA M A X. 
The system displays a trace caliper and a vertical dotted 
line.
2.  To position the caliper, move the Trackball.
3.  To fix the start point, press Set.
The system displays a second active caliper.
4.  To trace the waveform, move the Trackball.
5.  To complete the measurement, press Set.
The system displays VTI, Time, and TAMAX in the Results 
Window.  
						

							OB Measurements and Calculations
LOGIQ 5 Basic User Manual 9-53
Direction 2300002-100 Rev. 2
OB Worksheet
The OB Worksheet lists patient information, and all 
measurement and calculation data.
To view the OB Worksheet:
1. Press Measure.
2. Select Worksheet Display. 
 Figure 9-6. OB Worksheet
The OB Worksheet has three sections of information:
1. Patient data
2. Measurement information
3. Calculation information
2
3
1 
						

							OB/GYN
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Direction 2300002-100 Rev. 2
Patient data
The Patient data section, at the top of the worksheet, lists 
information from the Patient Data Entry screen. 
You can select the following fields:
•  FetusNo – if this is a multi-gestational patient, you can 
select the fetus in this field. You can also adjust the Fetus 
knob to select the fetus.
•  CUA/AUA – select the ultrasound age calculation method
•  Composite Ultrasound Age (CUA) – regression 
calculation
•  Average Ultrasound Age (AUA) – an arithmetic average
You can select the method in this field, or adjust the Select 
CUA/AUA knob.
You can enter information in the following fields:
•  FetusPos – type information about the fetus position.
•  PLAC – type information about the placenta.