Morphology-based brain midsagittal plane extraction method and system, terminal and medium

The invention discloses a morphology-based brain midsagittal plane extraction method. The method comprises the following steps: preprocessing a skull medical image to obtain a preprocessed image; performing skull removal on the preprocessed image to obtain a brain parenchyma three-dimensional mask; performing hole completion on the brain parenchyma three-dimensional mask, and expanding to the original skull to obtain an expanded image; selecting a brain middle slice from the expanded image to serve as a reference slice, and carrying out plane ellipse fitting through feature dimension reduction; calculating a semi-major axis and a semi-minor axis of the fitting ellipse and a major axis feature vector and a minor axis feature vector of the ellipse, and calculating a rotation angle by using the major axis feature vector through an anti-trigonometric function; and positioning and fitting the major axis coordinates of the ellipse, and obtaining the midsagittal plane according to the major axis coordinates and the