a patient positioning system for radiotherapy , comprising a device for positioning a patient within the framework of treatment planning , using image detection and / or carrying out radiation treatment , comprising a patient bed on which a patient is positioned , wherein means are provided by which the same bed may be arranged both on a planning couch for image detection within the framework of treatment planning as well as on a radiotherapy table , and by providing a reference means on the patient bed by which the position of the immobilized patient or of a marked radiation target is determined with respect to the patient bed . within this framework , a corresponding method is also provided , as well as an adjusting means for the transport and the bed .