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Positioning of FOV on a bottle phantom at isocenter (a) and off-center (b). With the isocentered FOV there is no image distortion produced (arrow, magnified zone). With the object-centered FOV (the FOV was moved away from the isocenter in (a) to the center of the phantom) there is image distortion produced (arrow, magnified zone). (3T scanner, 8-channel knee coil, AWSOS sequence, TE/TR = 0.6/30 msec, θ = 15°, FOV = 220 mm, and matrix size = 256.)
