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. Author manuscript; available in PMC: 2008 Dec 8.
Published in final edited form as: Ultrasound Med Biol. 2007 May 22;33(9):1428–1437. doi: 10.1016/j.ultrasmedbio.2007.03.003

Figure 8.

Figure 8

In-vivo data: (a) a 2D slice of a 3D US image of a porcine heart with a wooden rod inside acquired during an intracardiac beating-heart procedure; (b) detection results after the analysis of intensity distributions, where the instrument appears white, tissue gray and blood black; (c) the segmentation of instrument and tissue after PCA: the instrument appears correctly segmented, but this is not the case for the whole 3D US image; (d) a slice of the 3D US image at a different location, where the tip of the instrument touches the tissue; (e) detection results after PCA at the new location showing FP; (f) improved results employing the watershed algorithm.