A device for determining a volume of projection of a dual-axis computed tomography system with at least one shutter, the device comprising: - an interface unit; - a projection module; - a position determination module; - a suggestion module; and - a database; wherein the interface unit is configured to receive a volume of interest for a computed tomography image showing an object; wherein the projection module is configured to determine a volume of projection (41, 42, 46) of a detector based on different simulated positions of the detector on a dual-axis trajectory around the object and based on a variable simulated position of at least one shutter; wherein the position determination module is configured to vary the simulated position of the at least one shutter for at least one of the different simulated positions of the detector such that the volume of projection (41, 42, 46) corresponds to the volume of interest; wherein the database is configured to store trajectories with pre-determined volumes of projection (41, 42, 46), and wherein the suggestion module is configured to choose a different trajectory from the database if the received volume of interest cannot be covered completely by the volume of projection (41, 42, 46) with the dual-axis trajectory of the detector and to provide it to a user. - an interface unit; - a projection module; - a position determination module; - a suggestion module; and - a database; wherein the interface unit is configured to receive a volume of interest for a computed tomography image showing an object; wherein the projection module is configured to determine a volume of projection (41, 42, 46) of a detector based on different simulated positions of the detector on a dual-axis trajectory around the object and based on a variable simulated position of at least one shutter; wherein the position determination module is configured to vary the simulated position of the at least one shutter for at least one of the different simulated positions of the detector such that the volume of projection (41, 42, 46) corresponds to the volume of interest; wherein the database is configured to store trajectories with pre-determined volumes of projection (41, 42, 46), and wherein the suggestion module is configured to choose a different trajectory from the database if the received volume of interest cannot be covered completely by the volume of projection (41, 42, 46) with the dual-axis trajectory of the detector and to provide it to a user. wherein the interface unit is configured to receive a volume of interest for a computed tomography image showing an object; wherein the projection module is configured to determine a volume of projection (41, 42, 46) of a detector based on different simulated positions of the detector on a dual-axis trajectory around the object and based on a variable simulated position of at least one shutter; wherein the position determination module is configured to vary the simulated position of the at least one shutter for at least one of the different simulated positions of the detector such that the volume of projection (41, 42, 46) corresponds to the volume of interest; wherein the database is configured to store trajectories with pre-determined volumes of projection (41, 42, 46), and wherein the suggestion module is configured to choose a different trajectory from the database if the received volume of interest cannot be covered completely by the volume of projection (41, 42, 46) with the dual-axis trajectory of the detector and to provide it to a user.