A method for positioning a mobile patient couch relative to a stationary medical device, comprises: capturing, by an optical sensor, a first optical marker in an image; providing the image to a controller; determining, by the controller, a position and/or orientation of the mobile patient couch relative to the stationary medical device based on the image of the first optical marker and/or of the first optical marker comprised by the image; and positioning the mobile patient couch by controlling the drive unit and/or the steering unit based on the position and/or orientation of the mobile patient couch relative to the stationary medical device.