A superconducting cable includes: a cable core having a superconducting conductor; a thermal insulation pipe accommodating the cable core and functioning as a forward path of a coolant channel; and a coolant return pipe disposed beside the cable core in the thermal insulation pipe and functioning as a backward path of the coolant channel. The seal element has an axial passage therethrough. The reconstructor comprises a clipping subsystem for clipping an outside of the object from the reconstruction, based on the shape model, or the reconstructor is arranged for reconstructing only an inside andor boundary of the object as defined by the shape model.