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ON THE COVER

The "motion-frozen" technique improves the display and quantification of gated myocardial perfusion SPECT images. Three-dimensional phase-to-phase motion vectors are derived by sampling the epi- and endocardial surfaces. In this illustration of displacement vectors used in image warping, the end-systolic epicardial surface is shown with perfusion data represented in color. Displacement vectors (white) show local motion between end systole and end diastole. The end-diastolic position of the epicardial surface is marked with red points.

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