The paper demonstrates the application of the knife-edge scanning technique combined with a revolving object to dimensional computed tomography (CT). The presented arguments are equally valid for specific technical variants of the technique, such as a revolving scanner. The irradiation system is modified in comparison to that typically applied in CT, but the object is analysed within the same slice-plane. The proposed Scanning Computed Tomography (SCT) method is validated mainly by numerical modelling, and it is shown that it has significant potential in improving the measurement resolution. This results from the procedure of the data registration and the following application of the conventional software, including elaboration of the sinogram subsequently processed with the inverse Radon transform (IRT). The modelling is applied for the reconstruction of both an arbitrary-shaped aperture and intensity distribution in a radiation nano-focus. The proof-of-concept experiment was conducted in the visible spectrum range and for the Fresnel (near-field) zone.
