Fig. 2.

The space of feasible sampling, showing the combinations of N_bin and frequency ratio (f_sub/f_rot) for which the projection angles and subject phase bins are either completely (white) or incompletely (black) sampled before repetitious sampling. Parameter selection along the black lines may not provide sufficient sampling for image reconstruction. Typical ranges of f_sub and f_rot corresponding to conventional mechanical ventilation (CMV), spontaneous breathing, cardiogenic motion, and high-frequency oscillatory ventilation (HFOV) are shown.