Embodiments of the disclosure relate to a method for reconstructing a spatial position of a conduit arranged to accommodate a radiotherapeutic radioactive source, The method includes displacing an object emitting radiation inside the conduit prior to the administration of a treatment, detecting said radiation using detectors； generating data upon detecting the said radiation using a processor； and reconstructing the spatial position of the conduit by the processor based on the said data to identify a delivery path of the treatment.
