A method is for carrying out an imaging scan of a patient in a computed tomography system. In an embodiment, the method includes acquiring a respiratory cycle of the patient； providing the respiratory cycle as a reference respiratory cycle； selecting at least one respiratory phase of the reference respiratory cycle, shorter than a cycle period of the reference respiratory cycle； and carrying out the imaging scan in the computed tomography system. A respiration of the patient is acquired and is transferred as a respiratory signal progression； the respiratory signal progression is compared with the at least one selected respiratory phase of the reference respiratory cycle, by which a binary comparison result is generated； and dependent upon the binary comparison result, a data acquisition is triggered in the computed tomography system, by which projection data is acquired in the at least one respiratory phase.
