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. Author manuscript; available in PMC: 2014 Mar 17.
Published in final edited form as: Int J Comput Assist Radiol Surg. 2013 Jun 23;9(1):91–105. doi: 10.1007/s11548-013-0915-6

Fig 3.

Fig 3

The extracted electrodes and wires after thresholding the CT image (Left). The narrower wires inside the cranium (Brown) are removed by morphological filtering, and the electrodes (Red) inside the skull are preserved (Right).