The present invention relates to a device for determining a volume of projection of a dual-axis computed tomography system with at least one shutter, the device (1) comprising: an interface unit (2)； a projection module (3)； and a position determination module (4)； wherein the interface unit (2) is configured to receive a volume of interest (44) for a computed tomography image showing an object (22)； wherein the projection module (3) is configured to determine a volume of projection (41, 42, 46) of a detector (16) based on different simulated positions of the detector (16) on a trajectory around the object (22) and based on a variable simulated position of at least one shutter (15)； and wherein the position determination module (4) is configured to determine the simulated position of the at least one shutter (15) for each determined simulated position of the detector (16) such that the volume of projection (41, 42, 46) corresponds to the volume of interest (44). The present invention avoids that parts of an object of interest are unintentionally not imaged in dual-axis computed tomography imaging whilst reducing x-ray absorption to parts of the object outside the volume of interest (44) and provides improved insight in the volume of projection (41, 42, 46) of a dual-axis trajectory acquisition.
