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Figure 1 Tagged images of the left ventricular short-axis view (A), the magnitudes of the corresponding Fourier transform (B) and the corresponding phase images (C) in a dog with anterior infarct. The circles in the Fourier domain correspond to the size of the bandpass filter. Myocardial strain is directly related to the derivative of the phase, that is, the slope of the phase pattern (D). (E) Shows the left ventricular map of circumferential strain obtained by harmonic phase imaging in the same animal. Black indicates shortening, whereas yellow indicates stretching.
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