A method, device and software for performing tomographic imaging with several offset values in such a way that the first imaging phase is performed by scanning at least a part of the object to be imaged by following the first arc of the first rotating movement to produce the first image information, &mdash；the offset of the imaging is changed between imaging phases during imaging, &mdash；at least one other imaging phase is performed with at least one changed offset to produce second image information of at least part of the object, &mdash；the said image information produced by different offsets is combined into three-dimensional image information.
