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FIGURE 6. Interaction of attenuation artifact and respiratory motion artifact. Heart was at 30° caudal angulation; cold liver and spleen inserts were present. Myocardial insert contained 4.5 MBq 201Tl. Respiratory pattern was normal respiration. Distance-weighted polar plots and midvertical long-axis slices are illustrated. Normal = respiratory pattern (see Fig. 2B); AC = measured transmission AC with iterative reconstruction and scatter correction; 0, 1, and 2 cm = respiratory amplitude of phantom.
