Method of adjustment of laser sheets (4) for scanners arranged on a support for radiotherapy, using a device consisting of a monobloc assembly (1) comprising (3) a suitable electronic management card (8), and position sensors (3) for visualizing the position of the sheets (4) and automatically adjusting them using motorized systems, characterized in that the method comprises the steps of arranging the apparatus (1) in place； pre-setting the position via 3 support feet (6) and onboard spirit levels (7)； moving the scanner table for placing the front face (11) of the apparatus in the plane of the isocentre of the scanner and positioning via internal lasers of the scanner； acquisition of images for monitoring the position of the apparatus (1) and its finalization and validation, moving the scanner table by the nominal distance between the machine isocentre and the laser isocentre, which distance is determined and validated upon the installation of the lasers； connecting up and powering the apparatus (1) and laser sheets (4) with resetting of the positions to 0； initializing the search sequence of the laser sheets (4) by multiplexing, the position of each laser sheet (4) then being determined by virtue of the onboard cells (3) in the apparatus (1)； acquisition of the values and transfer, to the tablet PC, of the phase of adjustment of each laser sheet (4). Device for implementing it.Procédé d'ajustement de nappes laser (4) pour scanners agencés sur support pour radiothérapie, par un dispositif constitué d'un ensemble monobloc (1) comprenant (3) une carte électronique de gestion (8) adaptée, et des capteurs de position (3) pour visualiser la position des nappes (4), et les ajuster de manière automatique par systèmes motorisés, remarquable en ce qu'il comprend les étapes de mise en place de l'appareil (1)； de préréglage de la position via 3 pieds supports (6) et niveaux à bulles (7) embarqués； de déplacement de la table du scanner pour la mise en place de la face avant (1
