Abstract: A method of identifying an alveolar nerve region in a mandible image for dental implantation. The method includes: (a) slicing the 3-dimensional mandible image into a number of 2-dimensional slice images; (b) detecting a binary image object corresponding to a mandible region from one of the slice images; (c) grouping pixels of the binary image object of the mandible region into clusters each containing pixels having a similar intensity; (d) determining clusters that have pixels more than a predetermined minimum number of pixels, and determining the minimum labeled cluster having the lowest pixel intensity distribution among the clusters; (e) composing a new binary image containing pixels which belong to both the mandible region and the clusters having intensity distribution lower than that of the minimum labeled cluster, to extract a candidate nerve object; and (f) determining whether the candidate nerve object corresponds to the real alveolar nerve region.