Abstract: A method of correcting detector signals, in particular for scatter noise correction with an projection-based imaging device, comprises the steps of irradiating an object (1) with a radiation beam (2) including a plurality of discrete beam component (3, 3.1, 3.2) bounded by a plurality of masked angular ranges (4, 4.1, 4.2), so that the object (1) is partially irradiated with the beam components (3, 3.1, 3.2), detecting radiation transmitted through the object (1) with a detector device (30) comprising a plurality of detector portions (32, 32.1, 32.2, 33.1, 33.2), wherein direct radiation of the beam components (3) is detected by directly irradiated detector portions (32, 32.1, 32.2), detecting indirect radiation occurring in the masked angular ranges by masked detector portions (33.1, 33.2) adjacent to the directly irradiated detector portions (32, 32.1, 32.2), and correcting detector signals of the directly irradiated detector portions (32, 32.1, 32.

Abstract: An irradiation method, in particular for imaging a region of investigation (2) of an object (1), comprises generating at least one energy input beam (3) with at least one energy input beam source (210), wherein the at least one energy input beam (3) comprises a plurality of individual energy input beam components (3.1, 3.2, 3.3, . . . ), and irradiating the region of investigation (2) with the at least one energy input beam (3) along a plurality of projection directions, wherein the energy input beam components (3.1, 3.2, 3.3, . . . ) are formed with at least one beam mask (211) made of an energy input shielding material with through holes. Furthermore, imaging methods and devices for irradiating or imaging the object are described.

Abstract: A method of reconstructing an (n+1)-dimensional image function ƒ representing a region of investigation comprises determining the image function ƒ from n-dimensional or less dimensional Radon data comprising a plurality of projection functions p?(t) measured corresponding to a plurality of predetermined projection directions (?), wherein the image function ƒ is determined as a sum of polynomials multiplied with values of the projection functions p?(t). Imaging methods, imaging devices, and computer tomography devices using this reconstruction method are described.