Fig. 3.

A 2D needle-directional slice of the cropped 3D US image with needles. The yellow lines are the inserted needles including shafts and tips [32]; the red arrows are noise points; the cyan arrows show the spatial continuity in tissues.

A 2D needle-directional slice of the cropped 3D US image with needles. The yellow lines are the inserted needles including shafts and tips [32]; the red arrows are noise points; the cyan arrows show the spatial continuity in tissues.