GE Logiq 9 User Manual

							Measurement and Analysis
LOGIQ E9 User Guide 2-17
Direction 5180302-100 Rev. 1
Circumference and area (trace) measurement (continued)
Open TraceTo trace the circumference of a portion of the anatomy and 
calculate its length: 
1. Press Measure.
2.  Press the appropriate Trackball key to select Open trace; a 
trace caliper displays.
NOTE:  For open trace, Area (A) is not displayed in the result 
window.
3.  To position the trace caliper at the start point, move the 
Trackball.
4.  To fix the trace start point, press Set. The trace caliper 
changes to an active caliper. 
5.  To trace the measurement area, move the Trackball around 
the anatomy. A dotted line shows the traced area.
6.  To complete the measurement, press Set. The system 
displays the circumference and the length in the Results 
Window.
HINTSBefore you complete the trace measurement:
•  To erase the line (bit by bit) back from its current point, 
move the Trackball or adjust the Ellipse control 
counterclockwise.
•  To erase the dotted line but not the trace caliper, press 
Clear once.
•  To clear the trace caliper and the current data measured, 
press Clear twice. 
						

							Performing an Exam
2-18 LOGIQ E9 User Guide
Direction 5180302-100 Rev. 1
Circumference and area (spline trace) measurement
To trace the circumference of a portion of the anatomy and 
calculate its area: 
1. Press Measure.
2.  Press the appropriate Trackball key to select Spline Trace; 
a Spline trace caliper displays.
3.  To position the first caliper at the start point, move the 
Trackball.
4.  To fix the trace start point, press Set. The first caliper turns 
yellow. The second caliper appears at the same position as 
the first caliper and is green. 
NOTE:  When pressing the Clear key once, the second caliper 
disappears and the first caliper is activated. 
If Clear is pressed again, the first caliper disappears and the 
Spline trace is cancelled.
5.  To position the second caliper, move the Trackball and 
press Set.  The third caliper appears at the same position.
NOTE: The Clear key functionality is the same as noted in the 
previous step.
The spline trace requires at least three points to draw the 
trace. Continue setting the points of the trace until the 
desired points are set.
6. Press Set again after the last caliper is fixed to finalize the 
spline trace. All points are removed from the line and the 
spline trace turns yellow.
NOTE: Pressing Set twice finishes the trace measurement.
If Clear is pressed twice when more than 3 points exist on 
the trace, all points are removed and the first caliper again 
displays.
NOTE:  Spline trace is not available through the factory default. The 
system defaults to trace. To enable spline trace, modify the 
Measure Key Sequence preset found in Utility -> Measure -> 
Advanced preset menu. 
						

							Measurement and Analysis
LOGIQ E9 User Guide 2-19
Direction 5180302-100 Rev. 1
Circumference and area (spline trace) measurement (continued)
Edit the spline
trace1. Select Cursor Select. The spline trace changes to green 
and all points appear on the trace as yellow. 
A pick-caliper appears on the center of the image and the 
message “Edit spline trace” displays at the bottom of the 
screen.
NOTE:  The pick-caliper is used to select and move the trace points.
Figure 2-1.  Edit spline trace
NOTE: Pressing Clear at this time removes all points and the trace 
graphic.
2.  Move the pick-caliper to the desired point and press Set. 
The point is activated and turns green.
3.  Move the point to the desired position and press Set. The 
point is fixed and turns yellow. The pick-caliper appears on 
the center of the image.
NOTE:  The spline trace is updated at run time.
NOTE:  To remove a point, press Clear while moving the point. The 
trace turns green and the remaining points continue to be 
shown as yellow. If there are less than three points, the 
spline trace is removed.
4. Press Set again. All points are removed from the trace and 
the trace is shown as yellow. 
						

							Performing an Exam
2-20 LOGIQ E9 User Guide
Direction 5180302-100 Rev. 1
IMT Measurement
You can measure the average of the intima media thickness for 
use as the index of arterial sclerosis. 
NOTE:  The IMT measurement is available with linear probes only.
NOTE:  Due to the physical properties of ultrasound imaging, the 
posterior IMT measurement is generally more accurate than the 
anterior IMT measurement.
1.  Before you measure the IMT, add the IMT measurement to 
the Carotid folder via the Measurement & Analysis screen 
(by selecting one of the three types of IMT measurements 
under Add Measurement in the M&A screen).  
•  IMT: Three vertical lines are parallel. Place the start 
point on the line and place the end point anywhere.
•  IMT2: Each vertical line can be rotated with the Ellipse 
control. You must place the start and end points on the 
line.
•  5mm Scale: The horizontal line can be rotated with the 
Ellipse control. A maximum of 20 distance values which 
produce one average value can be taken. The number 
of distance values is specified when adding the 
measurement in the M&A screen.
IMT and IMT2 have three kinds of measurements:
•  IMT --+/IMT2 --+: Measure from right to left. 
•  IMT -+-/IMT -+-: First measure at the center, then right 
and left are last. 
•  IMT+--/IMT2 --+: Measure from left to right. 
2.  Scan the carotid artery, then press Freeze.  
						

							Measurement and Analysis
LOGIQ E9 User Guide 2-21
Direction 5180302-100 Rev. 1
IMT Measurement (continued)
3. Press Measure, then select IMT1, IMT2 or 5mm scale. An 
active caliper displays. 
Figure 2-2. IMT caliper (Example)
4. Use the Trackball to move the caliper and the Ellipse 
control to adjust the angle. Press Set to fix the caliper. 
NOTE:  The interval of the vertical line for IMT1 and IMT2 is 1cm 
and for the 5mm scale is 5mm. 
5.  Measure the thickness of three points for IMT1 and IMT2.
OR
Measure the thickness of the specified number of points for 
the 5mm scale.
NOTE:  The caliper moves to the next point automatically.  
						

							Performing an Exam
2-22 LOGIQ E9 User Guide
Direction 5180302-100 Rev. 1
IMT Measurement (continued)
6.  After you complete the measurement, the system calculates 
the average automatically. 
Figure 2-3. IMT Measurement 
						

							Measurement and Analysis
LOGIQ E9 User Guide 2-23
Direction 5180302-100 Rev. 1Plaque Score Tool1.  Before you measure, add Plaque Score to the Carotid folder 
at the Utility -> Measure -> Measurement & Analysis screen 
(by selecting 2D Plaque Score under Add Measurement in 
the M&A screen).
Label the parameters you want measured:
•  Distance value (up to 20)
•  Sum (greater or equal to 1.1 mm)
•  Count (greater or equal to 1.1 mm)
•  Maximum value of each area
• Average value
•  Average value of each area
2.  Scan the carotid artery and press Freeze. Display dual 
images to measure across split screen images.
3. Press Measure and select Plaque Score Tool. An active 
caliper, one horizontal line and five vertical lines display. The 
interval of the vertical lines are 1.5 cm.
Figure 2-4. Plaque score example
4. Use the Trackball to move the caliper and the Ellipse 
control to adjust the angle. Press Set to fix the caliper.  
						

							Performing an Exam
2-24 LOGIQ E9 User Guide
Direction 5180302-100 Rev. 1 Plaque Score Tool
(continued)5.  Measure the thickness (up to twenty times) on any place as 
necessary.
Figure 2-5. Plaque Score Example 2
6.  The system displays the measurement result.
Figure 2-6. Plaque Score Example 3
NOTE:  Only calculates the value larger than 1.1mm.
7.  Double click the Set key to finish the measurement. 
						

							Measurement and Analysis
LOGIQ E9 User Guide 2-25
Direction 5180302-100 Rev. 1
Doppler Mode Measurements
Four basic measurements can be made in Doppler Mode.
• Velocity
•  TAMAX and TAMEAN (Manual or Auto Trace)
•  Two Velocities with the Time Interval and Acceleration 
between them
• Time Interval
• Volume Flow
NOTE:  The following instructions assume that you do the following:
1.  In the B-Mode part of the display, scan the anatomy you 
want to measure.
2.  Go to the Doppler Mode part of the display.
3. Press Freeze.
Ve l o c i t y
To measure velocity: 
1. Press Measure; an active caliper with a vertical dotted line 
displays.
2.  To position the caliper at the desired measurement point, 
move the Trackball.
3.  To complete the measurement, press Set. The system 
displays the velocity measurement in the Results Window. 
						

							Performing an Exam
2-26 LOGIQ E9 User Guide
Direction 5180302-100 Rev. 1
TAMAX and TAMEAN
Manual TraceThe value measured depends upon the Vol Flow Method preset. 
The two selections available are: Peak (TAMAX) and Mean 
(TAMEAN). 
To do a manual trace of TAMAX or TAMEAN: 
1. Press Measure twice; a trace caliper displays. 
2.  To position the caliper at the trace start point, move the 
Trackball.
3.  To fix the start point, press Set.
4.  To trace the maximum values of the desired portion of the 
spectrum, move the Trackball.
NOTE: To edit the trace line, move the Trackball.
5.  To complete the measurement, press Set. The system 
displays the measurement values in the Results Window. 
Auto TraceThe value measured depends upon the Vol Flow Method preset. 
The selection available is the Peak (TAMAX). 
To auto trace TAMAX: 
1. Press Measure twice; an active caliper with a vertical dotted 
line displays.
2.  To position the caliper at the trace start point in the Doppler 
spectrum, move the Trackball.
3.  To fix the start point, press Set.
4.  To position the vertical caliper at the end point, move the 
Trackball.
5.  To complete the measurement, press Set. The system 
automatically fixes both calipers and traces the maximum 
value between the two points. The system displays this 
value in the Results Window. 
NOTE:  When you set the Auto Trace for Both (above and below), 
the system picks up the maximum power of the signal, NOT 
the maximum velocity. If the maximum velocity is not the 
maximum power, the system may not trace accurately. If 
you want to use maximum velocity, select either Above or 
Below.