Myocardial Strain Measurement With 2-Dimensional Speckle-Tracking EchocardiographyDefinition of Normal Range
Thomas H. Marwick, MD*,*,
Rodel L. Leano, BS*,
Joseph Brown, BS*,
Jing-Ping Sun, MD ,
Rainer Hoffmann, MD ,
Peter Lysyansky, PhD ,
Michael Becker, MD,
James D. Thomas, MD
* University of Queensland, Brisbane, Australia
Cleveland Clinic, Cleveland, Ohio
RWTH Hospital, Aachen, Germany
General Electric Medical Systems, Haifa, Israel
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Figure 1 Processing and Presentation of 2DS
(A) Tracking quality (TQ) approval screen; segments with adequate tracking are assigned a green V mark (TQ <3). (B) Strain profiles from each apical view. Average segmental values in each segment are used to generate a parametric ("bull's eye") display of the entire left ventricle. 2CH = 2-chamber; 4CH = 4-chamber; ANT = anterior; APLAX = apical long-axis; AVC = atrioventricular canal; INF = inferior; LAT = lateral; POST = posterior; SEPT = septal.
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Figure 2 Relationship Between TQ and Segment Location
Relationship between tracking quality (TQ) (mean and SD of TQ score, y axis), wall (color coded, see legend), and segment location (x axis). The TQ scores are best (closest to 1) in the mid-wall and worst (averages >1.5) in the anterior and posterolateral walls. This regional variation emphasizes the role of image quality (especially edge detection) on TQ.
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