In a computed tomography scanner (1) having an emitter (9) for emitting a beam (10) of given radiation through an object to be analysed, a detector (11) for receiving said beam (10) after the beam (10) itself has traversed the object, and a rotating arm (7), which supports the emitter (9) and the detector (11) and rotates the emitter (9) and the detector (11) about the object along a series of angular positions (±i), there is generated a succession of first pulses (17), each of which activates the detector (11) in one respective angular position (±i), and a succession of second pulses (19, 20 21) for activating the emitter (9) so that it will emit a dose of radiation in each angular position (±i), associated to which is a respective dose of radiation in such a way as to pre-define a distribution of doses of radiation along the series of angular positions (±i).
