GE Vivid 7 User Manual

Quantitative Analysis
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 Figure 7-8: Curve fitting examples, A) wash-in, B) wash-out A=900 
AU, B=300 AU for all curves
1. Intensity (AU)
2. Time (s)
0 1200
900
600
300
12345678910
k=0.15k=0.3k=0.7
0 1200
900
600
300
1234 5678910
k=0.15
k=0.7
AB 

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Wash-in cur ve fitting analysis
Over view
The purpose of wash-in curve fitting analysis is to find and 
estimate local perfusion rate using contrast agent. There are 
two methods to obtain this information:
•  Use the Real-time Myocardial Contrast application (see 
page 202) with low transmit power (MI 0.1). Applying Flash 
will destroy most or all contrast within the imaging plane. 
The period of low power imaging immediately following...

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7. Rotate the HORIZONTAL SWEEP assignable and scroll 
through the cineloop to visualize a specific part of the data, 
typically the region immediately after Flash.
8. Rotate the 
LEFT MARKER and RIGHT MARKER assignables to 
apply curve fitting to a specific region.
9. Trackball to the Analysis window.
10. Press 
UPDATE MENU in the trackball area on the control 
panel.
The System menu is displayed.
11. Trackball to Curve fitting.
12....

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 Figure 7-10: Wash-in curve fit of Real Time MC data
Wash-in cur ve fitting using var ying triggering 
inter vals
If the data set contains frames with uneven time intervals, e.g. 
triggered images with increasing triggering intervals, it is 
possible to plot the data using the time interval (dt) on the X-
axis.
1. Disable unwanted frames. Curve fitting will be performed 
using all enabled frames.
The frame disabling 
procedure is ex-...

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Up to eight different 
sample areas may be 
generated in the 
myocardium.3. Press SELECT to anchor a sample area in the myocardium.
4. Repeat steps 2 and 3 if other sample areas are desired.
5. If desired, reshape the sample area as described on 
page 250.
See page 245 for 
more information 
on sample area 
manual tracking.6. Perform manual tracking of the sample areas on all 
frames to ensure that the sample area is inside the...

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 Figure 7-12: Wash-in curve fitting after varying triggering interval
1. Parameter window
Angio (dB)
(s)
121 

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Wash-out cur ve fitting analysis
Over view
The purpose of wash-out curve fitting analysis is to find and 
estimate a local wash-out rate. The analysis may be used for 
wash-out of contrast from LV or myocardium.
Performing wash-out cur ve fitting
From a contrast examination in Quantitative analysis:
1. Disable frames that are significantly different (i.e. because 
of respiration or probe movements), see page 248.
2. Trackball the sample...

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 Figure 7-13: The Curve fitting menu
13. Trackball to Wash-out.
14. Press 
SELECT.
The Wash-out curve is displayed in the Analysis window 
(see Figure 7-14).
 Figure 7-14: Wash-out curve fit of two sample regions in an in-vitro 
experiment
Angio (dB)
(s) 

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Anatomical M-Mode
Introduction
M-Mode applied to TVI, Tissue Tracking, Strain rate, Strain or 
intensity data (Contrast) calculates and color/codes data 
accordingly along a path drawn by the operator.
Using Anatomical M-Mode
1. Press the CAMM assignable.
2. In one of the Cineloop windows, trackball to the region from 
where to start the sampling path.
3. Press 
SELECT to anchor the first point of the path.
4. Trackball to the location...

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 Figure 7-15: The anatomical M-Mode display (here TVI data)
1. Cineloop window
2. Analysis window3. Path anchor point
4. Time scale
2
3
4
1
3