GE Logiq P5 User Manual

							Vascular Measurements
LOGIQ 5 Basic User Manual 11-11
Direction 2300002-100 Rev. 2
A/B Ratio
In B-Mode and M-Mode, you can calculate A/B ratio by diameter 
or by area.
DiameterTo calculate A/B ratio by diameter:
1.  From the Generic Touch Panel, select A/B Ratio. 
2. Select ratio(Diam). 
The system displays an active caliper.
3.  Make a distance measurement of the first velocity. 
The system displays an active caliper for the second 
distance measurement.
4.  Make a distance measurement of the second velocity. 
The system displays each distance measurement and the  
A/B ratio in the Results Window.
NOTE:  The first caliper is the A velocity. The second caliper is the B 
velocity.
For details on how to make a distance measurement, See 
‘Distance measurement’ for more information.
AreaTo calculate A/B ratio by area:
1.  From the Generic Touch Panel, select A/B Ratio. 
2. Select ratio(Area). 
The system displays a trace caliper.
3.  Make a trace measurement of the A velocity.
NOTE:  To erase an open trace, move the Trackball.
The system displays a second trace caliper. 
4.  Make a trace measurement of the B velocity.
The system displays the two area measurements and the  
A/B ratio in the Results Window.
For details on how to make a trace measurement, See 
‘Circumference and area (trace) measurement’ for more 
information. 
						

							Vascular
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Direction 2300002-100 Rev. 2
M-Mode Measurements
 Figure 11-4. M-Mode Touch Panel
NOTE:  The following instructions assume that you first scan the patient 
and then press Freeze. 
						

							Vascular Measurements
LOGIQ 5 Basic User Manual 11-13
Direction 2300002-100 Rev. 2
% 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.
For the diameter calculation, do NOT take a distance 
measurement from a longitudinal view. This may lead to an 
inaccurate assessment of % stenosis. 
						

							Vascular
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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. 
The system displays each distance measurement and the  
A/B ratio in the Results Window.
NOTE:  The first distance measurement is the A velocity. The second 
distance measurement is the B velocity. 
						

							Vascular Measurements
LOGIQ 5 Basic User Manual 11-15
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.  
						

							Vascular
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Direction 2300002-100 Rev. 2
Doppler Mode Measurements
 Figure 11-5. D-Mode Touch Panel Example
Control Assignment
Cancel TransferAfter the Auto Vascular calculation results are assigned to a 
particular vessel, the user can cancel the assignment and 
assigned parameters are removed from Worksheet and Report 
page.
When Cancel Transfer occurs, a message appears on the 
screen to indicate the value was erased from Worksheet and 
Report page.
Vessel locationIf the vessel has a location, you can select one of the following:
• Proximal (Prox)
• Middle (Mid)
• Distal (Dist)
Side Rt/LtThe system has measurements for the patients right and left 
side. To select right or left, adjust the Touch Panel knob.
TAMAX AUTO/
MANUALTo select Auto Doppler Trace or Manual Doppler Trace at the 
time you are making a measurement, adjust the Touch Panel 
knob.
•  Select AUTO – the system traces the peak velocity 
envelope from the begin time to the end time. 
•  Select MANUAL – trace the waveform manually. 
						

							Vascular Measurements
LOGIQ 5 Basic User Manual 11-17
Direction 2300002-100 Rev. 2
Control Assignment (continued)
Modify Auto CalcsWhen you select this key, the Modify Calculation menu is 
displayed as below. In this menu, you select parameters to 
display in the Auto Vascular Calculation window. Only 
parameters that can be used by the calculation are displayed.
Select Save as Default to save the selected parameters as the 
default calculations for this application.
Select Return to return to the previous Touch Panel screen.
If you select PV, all selected parameters are turned off. When 
you deselect PV, the system returns to the previously selected 
calculation.
 Figure 11-6. Modify Auto Calculation Menu (Page1) 
						

							Vascular
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Direction 2300002-100 Rev. 2
Naming format for vessels
When you want to measure a vessel, on the Touch Panel you 
select the folder for the vessel. Many vessel folders are labeled 
with an abbreviation. The following table lists abbreviations used 
for naming vascular vessels. 
Table 11-2: Vascular Vessel Abbreviations
AcronymName
ACA Anterior Cerebral Artery
AComA Anterior Communicating Artery
Axill Axillary Artery
Axill V Axillary Vein
BA Basilar Artery
Basil V Basilic Vein
Brac V Brachial Vein
CCA Common Carotid Artery
Ceph V Cephalic Vein
CHA Common Hepatic Artery
Com Femoral Common Femoral Artery
Com Iliac Common Iliac Artery
Com Iliac A Common Iliac Artery
Dors Pedis Dorsalis Pedis
ECA Exterior Carotid Artery
Ext Iliac External Iliac Artery
ICA Internal Carotid Artery (Transcranial Doppler)
ICA Interior Carotid Artery (Carotid Artery)
IMA Inferior Mesenteric Artery
Inno V Innominate Vein
IVC Inferior Vena Cava
MCA Middle Cerebral Artery
Mcub V Median Cubital Vein
Mid Hep V Middle Hepatic Vein
MRA Main Renal Artery 
						

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Direction 2300002-100 Rev. 2
PCA Posterior Cerebral Artery
PComA Posterior Communicating Artery
SMA Superior Mesenteric Artery
SMV Superior Mesenteric Vein
SUBC Subclavian Artery
SUBC V Subclavian Vein
Sup Femoral Superficial Femoral Artery
TCD Transcranial Doppler
TIPS Transjugular Intrahepatic Portosystemic Shunt
VERT Vertebral Artery
Table 11-2: Vascular Vessel Abbreviations
AcronymName 
						

							Vascular
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Direction 2300002-100 Rev. 2
Auto Vascular Calculation Overview
Auto Vascular Calculation enables the LOGIQ 5 to detect and 
identify a cardiac cycle. It allows you to assign measurements 
and calculations during live timeline imaging, while the image is 
frozen, or in CINE. Peak values are detected for venous flow.
During cardiac cycle detection, the system identifies the cardiac 
cycle using calipers, vertical bars, and/or highlighting of timeline 
data. Use of identifiers is based on measurements and 
calculations selected by an operator for the current application. 
The system may place calipers at early systolic peak, peak 
systole, minimum diastole and end diastole. Vertical bars may 
also be placed to indicate the beginning and end of the cardiac 
cycle. The peak and/or mean trace may be highlighted. You can 
edit the cardiac cycle identified by the system or select a 
different cardiac cycle.
You can select the calculations to be displayed in the M&A 
Result window during live scanning or on a frozen image. These 
calculations are displayed at the top of M&A Result Window 
located adjacent to the image. These calculations are 
presettable by application which means you can set up the 
default calculations to be displayed for each application.