关键词: 三维重建, 形心, 立体定向

Abstract: Objective To reconstruct three-dimensional(3-D)structures of the internal capsule(including anterior limb,genu and posterior limb) with ultrathin freezing transection, and the length,width, volume, and centroid of the internal capsule were obtained and to provide an important theoretic basis for stereotactic surgery for multiple diseases of the internal capsule. Methods Three male skulls without structural diseases were selected. Each of these skulls was cut into 1-millimeter-thick layer,the photographs were taken with digital camera and the data was put into the computer. Then the border line in layers that contained the internal capsule was drawn with self-made software, the 3-D reconstruction was gotten and the data was measured. Results The midpoint of intercomissural distance was considered as original point of brain and then the centroid coordinates of the internal capsule was gotten. The centroid coordinates of the left internal capsule were －15.761 9，2.203 2 and 10.143 8 mm;the right were 17.932 0，2.656 5 and 6.384 4 mm.The volume of the left internal capsule was 4　009.173 0 mm³，the right was 4 217.234 0 mm³. After three-dimensional reconstruction, the appearance of the internal capsule looked like irregular plate-form domian. Its inner surface was convex while the external surface was concave, and the anterior limb was short while the posterior limb was high.Conclusion The reconstructed internal capsule and its parts which demonstrate the natural shape and exact position of the structures are realistic, they can be displayed in artificial colour and true colour. It provides an anatomic basis for stereotactic surgery for the treatment of the vascular disease,functional neurosurgery disease and psychiatrical surgery disease of the internal capsule.

Key words: three-dimensional reconstruction, centroid, stereotaxis