A method for adjusting laser beams (4) for scanners arranged on a support for radiotherapy, by a device consisting of a one-piece assembly (1) comprising (3) a suitable electronic control board (8), and position sensors (3) for visualizing the position of the beams (4), and adjusting them automatically by motor-driven systems, which is remarkable in that it comprises the steps of installing the apparatus (1)； presetting of the position via 3 support feet (6) and embedded spirit levels (7)； movement of the table of the scanner to position the front face (11) of the apparatus in the plane of the isocenter of the scanner and positioning via internal lasers of the scanner； acquisition of position control images of the apparatus (1) and finalization and validation thereof, movement of the table of the scanner by the nominal distance between the machine isocenter and the laser isocenter, which is determined and validated at the time of installation of the lasers； connection of the apparatus (1) and powering up thereof and of the laser beams (4) with 0 resetting of the positions； startup of the multiplexing-based laser beam (4) search sequence, the position of each laser beam (4) then being determined by virtue of the embedded cells (3) in the apparatus (1)； acquisition of the values and transfer to the tablet PC of the adjustment phase of each laser beam (4). Device for implementing same.
