GE Logiq P5 User Manual

							LOGIQ 5 Basic User Manual 11-1
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Chapter 11
Vascular
Describes how to perform Vascular measurements and 
calculations. 
						

							Vascular
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Vascular Exam Preparation
Introduction
Measurements and calculations derived from ultrasound images 
are intended to supplement other clinical procedures available 
to the attending physician. The accuracy of measurements is not 
only determined by the system accuracy, but also by use of 
proper medical protocols by the user. When appropriate, be sure 
to note any protocols associated with a particular measurement 
or calculation. Formulas and databases used within the system 
software that are associated with specific investigators are so 
noted. Be sure to refer to the original article describing the 
investigators recommended clinical procedures.
General Guidelines
New Patient information must be entered before beginning an 
exam. See ‘Beginning a New Patient’ for more information.
Any measurement can be repeated by selecting that 
measurement again from the Touch Panel Menu. 
						

							Vascular Measurements
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Vascular Measurements
Introduction
Vascular measurements offer several different types of 
measurement studies:
 Figure 11-1. Vascular Exam Category Touch Panel
•  Generic – Common to all applications. See ‘Generic 
Measurements’ for more information.
• Carotid
•  LEA (Lower Extremity Artery)
•  LEV (Lower Extremity Vein)
•  TCD (Trans Cranial Doppler)
•  UEA (Upper Extremity Artery)
•  UEV (Upper Extremity Vein)
• Renal 
						

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Introduction (continued)
To change an exam calc:
1. Select Exam Calcs.
The Vascular exam category allows you to choose from the 
displayed exam calcs.
2.  To select another exam calcs, press the desired exam calcs 
folder.
A vascular study is a group of the particular vessels. You can 
customize the vessel exam calcs in the configuration menu.
When you use Auto Vascular calculation, you use the vessel 
keys on the Touch Panel to post-assign vascular calculations. 
When you are not using Auto Vascular calculation, the vessel 
key is used for manual measurement. 
						

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B-Mode Measurements
 Figure 11-2. B-Mode Touch Panel
NOTE:  The following instructions assume that you first scan the patient 
and then press Freeze. 
						

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%Stenosis
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.  From the Generic Touch Panel, 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. 
The system displays an active caliper for the second 
distance measurement.
4.  Make a distance measurement of the outer area of the blood 
vessel. 
The system displays each distance measurement and the  
% Stenosis in the Results Window.
For information about how to make a distance measurement, 
See ‘Distance measurement’ for more information.
NOTE:  For the diameter calculation, do NOT take a distance 
measurement from a longitudinal view. This may lead to an 
inaccurate assessment of % stenosis. 
						

							Vascular Measurements
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% Stenosis (continued)
AreaTo calculate percent stenosis by area:
1.  From the Generic Touch Panel, 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.
NOTE:  To erase an open trace, move the Trackball.
The system displays a second trace caliper. 
4.  Make a trace measurement of the outer area of the blood 
vessel.
The system displays the two area measurements and 
percent stenosis in the Results Window.
See ‘Circumference and area (trace) measurement’ for more 
information. 
						

							Vascular
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Vo l u m e
The volume calculation can be made from any of the following 
measurements: 
• One distance
• Two distances
• Three distances
• One ellipse
•  One distance and one ellipse
For details on how to make a distance measurement, See 
‘Distance measurement’ for more information.
For details on how to make an ellipse measurement, See 
‘Circumference and area (ellipse) measurement’ for more 
information.
NOTE:  IMPORTANT! If you want to make a volume calculation using 
one or two distances, you must select Volume BEFORE you 
make the measurements.
To make a volume calculation using one or two distances: 
1. Select Volume.
2.  Make one or two distance measurements.
3. Select Volume.
The system displays the distances and the volume in the 
Results Window.
To make a volume calculation using three distances:
1.  Make three distance measurements.
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.
2. Select Volume.
The system displays the distances and the volume in the 
Results Window. 
						

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Volume (continued)
To make a volume calculation using one ellipse: 
1. Select Volume.
2.  Make one ellipse measurement.
3. Select Volume.
The system displays the ellipse measurement and the 
volume in the Results Window.
To make a volume calculation using one ellipse and one 
distance: 
1. Select Volume.
2.  Make one distance measurement and one ellipse 
measurement.
3. Select Volume.
The system displays the distance and ellipse measurement 
and the volume in the Results Window.
Calculation formulas are available in the Advanced Reference 
Manual.
HINTS•  Volumes are most accurate when measurements are taken 
in the sagittal and axial scan planes.
•  To display sagittal and axial plane images simultaneously, 
use the side-by-side dual format option. 
						

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Volume (continued)
 Figure 11-3. Volume Calculation Examples
1. One distance
2. Two distances
3. Three distances
4. One ellipse
5.  One distance and one ellipseTable 11-1: Volume Calculations 
Calc NameInput Measurements
Volume (spherical) One distance
Volume (prolate spheroidal) Two distances, d1>d2
Volume (spheroidal) Three distances
Volume (prolate spheroidal) One ellipse: (d1 major axis, d2 minor axis)
Volume (spheroidal) One distance d1, and one ellipse (d2 major axis, d3 minor axis)
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