FIGURE 1.

Schematic representation of patient positions (top) and of SPECT data from 2 patients belonging to supine and sitting subgroups, respectively, and who were ultimately considered as having attenuation artifacts (bottom). Biker position provides shorter distance between LV and camera head (yellow arrows) on axial tomographic slices, better separation of inferior wall from subphrenic organs (red arrows) on left profile projections, lower amplitude of longitudinal motions of upper LV border on panograms (green arrows, comparing supine with biker positions), and less severe inferior attenuation artifacts on polar maps.