1. A method of imaging comprising: acquiring a set of projections acquired for different positions of projection source that is situated a finite distance; undertaking a set of rectifications of the projections, the rectifications comprising transforming data of the acquired projections into projection data on a virtual rectification support placed in a preset orientation in concordance with a set of reconstruction calculation points distributed over an image to be reconstructed; and reconstructing the image from the rectified set of projections.