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FIGURE 5. Demonstration of respiratory motion artifact and its dependence on respiratory pattern. For these experiments, myocardial inferior wall self-attenuation was avoided by positioning heart truly horizontally (perpendicular to face of detector), and no liver or spleen inserts were present. Myocardial insert contained 40 MBq 99mTc. Midshort-axis (SA) slices are illustrated. Normal, Even, Reverse = respiratory pattern (see Fig. 2B); AC = measured transmission AC with iterative reconstruction and scatter correction; 0, 1, 2, and 3 cm = respiratory amplitude of phantom.
