1. INTRODUCTION
The human cerebral cortex is highly folded and variable across individuals. Sulcal pits are the locally deepest points along sulcal lines in the cerebral cortex [1]. During the human brain development, the deepest parts of primary sulci are the first places to develop in an embryo's brain and then change least as the cortex growing [1]. Quantitative MR imaging studies provide strong evidences that the deeper parts of sulci are more genetically controlled than the superficial parts [12]. Abundant studies [1], [2], [3] indicate that there is a particularly spatial relationship between the deepest parts of sulci and functional areas.