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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: J Am Soc Echocardiogr. 2011 Oct 13;25(1):121–128. doi: 10.1016/j.echo.2011.09.001

Figure 3.

Figure 3

Depiction of how the EchoPAC PC program from GE computes LV rotation from 2D echocardiographic cine loops. The software allows the user to draw a region of interest (ROI) on the reference frame of image encircling myocardium and tracks the myocardial motion within that ROI in successive frames of image loop. A center of gravity is defined by averaging kernels within the ROI around the circumference of the SAX view. LV rotation is computed as angular displacement of segments around that center of gravity.