Medical image cardiothoracic ratio measuring method and system based on artificial intelligence

The invention discloses a medical image cardiothoracic ratio measuring method and system based on artificial intelligence, and the method comprises the steps: obtaining a first picture, which is shot by a camera at the top, of a user standing in front of a radiation mainboard, and obtaining an initial azimuth angle of the user relative to the radiation mainboard according to the first picture; judging whether the absolute value of the initial azimuth angle exceeds a first preset angle; starting the chest X-ray imaging equipment, and collecting a first chest medical image of the user standing in front of the radiation mainboard; adjusting a binarization threshold according to the initial azimuth angle, and performing binarization processing on the first chest medical image according to the binarization threshold to obtain a binarized image; extracting a contour line of the lung in the binarized image by adopting a gradient operator; and dividing the heart transverse diameter by the thoracic transverse diameter