The present invention relates to a method and a system for dividing a brain region by using a magnetic resonance imaging (MRI). According to the present invention, the method and the system for dividing the brain region using the MRI generate an initial lateral ventricle region by using a standard brain map image and update the lateral ventricle region based on the brightness value threshold, thereby increasing accuracy and efficiency. In addition, the method and the system for dividing the brain region using the MRI of the present invention generate the initial lateral ventricle region by using a standard brain map image, so it is unnecessary to manually input a starting point, and the brightness value threshold reflecting characteristics of the individual MRI image is automatically set by analyzing the brightness distribution of the initial lateral ventricle region generated by an individual MRI image, thus it can be performed with respect to the MRI T2-emphasized MRI images or FLAIR MRI images as well as T1-emphasized MRI images. Since operating in such a way that the lateral ventricle area is updated starting from the initial lateral ventricle region other than one start point, only the small number of limited repetitions are performed, thereby preventing the region from excessively expanding along cerebrospinal fluid voxels, so the lateral ventricle region of an analysis subject is automatically divided very quickly and efficiently. Therefore, it may be useful for diagnosis and/or treatment of a brain disease and so on by comparing volume of the lateral ventricle region of the analysis subject with that of the normal lateral ventricle.COPYRIGHT KIPO 2017본 발명은 자기공명영상을 이용한 뇌 영역의 분할 방법 및 시스템에 관한 것이다. 본 발명에 따른 자기공명영상을 이용한 뇌 영역의 분할 방법 및 시스템은, 표준 뇌 지도 영상을 이용하여 초기 측뇌실 영역을 생성하고 밝기값 임계치에 기반하여 측뇌실 영역을 갱신함에 따라 정확성과 효율성을 높일 수 있다. 또한, 본 발명의 자기공명영상을 이용한 뇌 영역의 분할 방법 및 시스템은, 표준 뇌 지도 영상을 이용하여 초기 측뇌실 영역을 생성함으로써 시작점을 수동 입력할 필요가 없고, 개별 MRI 영상에서 생성된 초기 측뇌실 영역의 밝기값 분포를 분석하여 개별 MRI 영
