A method for displaying non-ultrasound 3D imaging data and ultrasound 2D imaging data, the method comprising: obtaining non-ultrasound 3D imaging data for a volume of interest, the non-ultrasound 3D imaging data including structural imaging data; receiving a first input identifying a target tissue of interest in the non-ultrasound 3D imaging data; receiving a second input identifying an initial set of anatomical fiducial markers in the non-ultrasound 3D imaging data; obtaining ultrasound 3D imaging data for the volume of interest, the ultrasound 3D imaging data including structural imaging data; fusing the ultrasound 3D imaging data and the non-ultrasound 3D imaging; generating a map between the non-ultrasound 3D imaging data and the ultrasound 3D imaging data based on the fused 3D imaging data; mapping the target tissue of interest and the initial set of fiducial markers of the non-ultrasound 3D imaging data to the ultrasound 3D imaging data using the map; receiving a third input identifying a further set of anatomical fiducial markers in at least one of: the non-ultrasound 3D imaging data and the ultrasound 3D imaging data, at least three of the fiducial markers of said further set of fiducial markers including a structure that is visually present in both the non-ultrasound 3D imaging data and the ultrasound 3D imaging data; obtaining ultrasound 2D imaging data, the ultrasound 2D imaging data including structural imaging data for a plane of the volume of interest, the plane including at least three fiducial markers; locating a plane, including location and orientation, in the non-ultrasound 3D imaging data that corresponds to the plane of the ultrasound 2D imaging data by matching said at least three fiducial markers with corresponding fiducial markers of said further set of fiducial markers; and visually displaying the non-ultrasound 3D imaging data with the ultrasound 2D imaging data superimposed at the corresponding plane located in the non-ultrasound 3D imaging data. obtaining non-ultrasound 3D imaging data for a volume of interest, the non-ultrasound 3D imaging data including structural imaging data; receiving a first input identifying a target tissue of interest in the non-ultrasound 3D imaging data; receiving a second input identifying an initial set of anatomical fiducial markers in the non-ultrasound 3D imaging data; obtaining ultrasound 3D imaging data for the volume of interest, the ultrasound 3D imaging data including structural imaging data; fusing the ultrasound 3D imaging data and the non-ultrasound 3D imaging; generating a map between the non-ultrasound 3D imaging data and the ultrasound 3D imaging data based on the fused 3D imaging data; mapping the target tissue of interest and the initial set of fiducial markers of the non-ultrasound 3D imaging data to the ultrasound 3D imaging data using the map; receiving a third input identifying a further set of anatomical fiducial markers in at least one of: the non-ultrasound 3D imaging data and the ultrasound 3D imaging data, at least three of the fiducial markers of said further set of fiducial markers including a structure that is visually present in both the non-ultrasound 3D imaging data and the ultrasound 3D imaging data; obtaining ultrasound 2D imaging data, the ultrasound 2D imaging data including structural imaging data for a plane of the volume of interest, the plane including at least three fiducial markers; locating a plane, including location and orientation, in the non-ultrasound 3D imaging data that corresponds to the plane of the ultrasound 2D imaging data by matching said at least three fiducial markers with corresponding fiducial markers of said further set of fiducial markers; and visually displaying the non-ultrasound 3D imaging data with the ultrasound 2D imaging data superimposed at the corresponding plane located in the non-ultrasound 3D imaging data. <EOS>