1. A method of acquiring an output image volume of a body, comprising the steps of: (a) for each of a plurality of actual dispositions of a projective fluoroscopic imaging device: (i) moving said projective fluoroscopic imaging device to said each actual disposition; (ii) acquiring a respective projective image of the body, using said projective fluoroscopic imaging device at said each actual disposition; (b) based on said projective images, determining an estimated disposition for said each actual disposition; and (c) based on said estimated dispositions, transforming said projective images into the output image volume.