The present invention relates to one kind for tracking device (10) of the intervening equipment (11) relative to the position of the plane of delineation (12) of ultrasonic field. The position includes distance outside face (Dop). It includes multiple energy converters to distal length (Ltde1. that geometry, which provides unit (GPU),.N), for multiple intervening equipment type (T1..Each of n), preset distance (Ltde) between each length and the distal end (17,47) of intervening equipment (11,41) and the ultrasonic detector (16,46) for being attached to the intervening equipment is corresponding. Image fusion unit (IFU) receives the data of the type (T) of the just tracked intervening equipment of instruction And performed the following operation based on the type (T): being provided in unit (GPU) from the geometry and select corresponding energy converter to distal length (Ltde) And instruction is for distance (Dop) outside the face of the intervening equipment in the ultrasonic field and the energy converter to distal length (Ltde) in the ultrasound image of reconstruction (RUI).
