Figure 2From: Phantom investigation of 3D motion-dependent volume aliasing during CT simulation for radiation therapy planning2D representation of motion of target centroid as a function of time. Motion is sinusoidal with period of 4 sec. Motion amplitude (A) represents the maximum excursion of the target centroid in the S-I direction about a reference position (0), and takes values ± 5 mm, ± 10 mm, or ± 15 mm. Motion phases π/2 and 3π/2 respectively coincide with the superior- and inferior-most excursions of the target centroid about the reference (0) position.Back to article page