Scattered radiation correction of detector signals for projection-based imaging

摘要

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 at least one discrete beam component (3, 3.1, 3.2) bounded by at least one masked angular range (4, 4.1, 4.2), so that the object (1) is partially irradiated with the beam component (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 at least one beam component (3) is detected by at least one directly irradiated detector portion (32, 32.1, 32.2), detecting indirect radiation occurring in the at least one masked angular range by at least one masked detector portion (33.1, 33.2) adjacent to the at least one directly irradiated detector portion (32, 32.1, 32.2), and correcting detector signals of the at least one directly irradiated detector portion (32, 32.1, 32.2) in dependence on the at least one detector signal of the at least one masked detector portion (33.1, 33.2) for providing corrected detector signals. Furthermore, an imaging device for projection-based imaging is described.