A medical system for shape sensing by interacting with a shape sensing element (12) configured to perform a shape sensing measurement of an interventional device (14) and by interacting with an image data generation unit (28) for generating image data (21) is provided. The medical system includes a shape sensing console (16) in communication with the shape sensing element (12) for generating measurement signals of the shape sensing measurement, a shape reconstruction unit (18) in communication with the shape sensing console for reconstructing a shape (19) of the shape sensing element based on the generated measurement signals, a receiving unit (22) for receiving a position and/or orientation of an apparatus (26, 26′) including the image data generation unit (28), a coordinate transformation unit (20) for registering the reconstructed shape (19) by representing the reconstructed shape (19) in a coordinate system based on the received orientation of the apparatus (26, 26′), and a connector unit (32) for connecting the shape sensing console (16) and/or said shape reconstruction unit (18) to the shape sensing element (12), the connector unit (32) being detachably connectable to a housing (30) of the apparatus (26, 26′).