A medical image generation method, wherein the method comprises: acquiring projection data of a scanned object during the movement of a scanning table and the rotation of a radiographic source, and using corresponding projection data in two opposite scanning directions in the projection data to generate a scout image of the scanned object in one scanning direction, wherein the scanning direction is used to represent the relative position relationship between the radiographic source and the scanned object, wherein using corresponding projection data in two opposite scanning directions in the projection data to generate a scout image of the scanned object in one scanning direction comprises: extracting corresponding equivalent projection data in a second scanning direction from corresponding projection data in a first direction range of a first scanning direction and inserting the equivalent projection data into corresponding projection data in the second scanning direction, wherein the second scanning direction is opposite to the first scanning direction, characterized in that extracting corresponding equivalent projection data in a second scanning direction from corresponding projection data in a first direction range of a first scanning direction comprises: for each scanning direction of a plurality of scanning directions in the first direction range, extracting corresponding line projection data of one ray sub-beam from corresponding projection data in the scanning direction, wherein the ray sub-beam is a collection of rays of the ray beam emitted from the radiographic source in the scanning direction, with the included angle between the projection of the rays on the plane of the gantry and the plane where the scanning table is located within a preset angle range, and re-sorting the extracted line projection data to obtain the equivalent projection data. acquiring projection data of a scanned object during the movement of a scanning table and the rotation of a radiographic source, and using corresponding projection data in two opposite scanning directions in the projection data to generate a scout image of the scanned object in one scanning direction, wherein the scanning direction is used to represent the relative position relationship between the radiographic source and the scanned object, wherein using corresponding projection data in two opposite scanning directions in the projection data to generate a scout image of the scanned object in one scanning direction comprises: extracting corresponding equivalent projection data in a second scanning direction from corresponding projection data in a first direction range of a first scanning direction and inserting the equivalent projection data into corresponding projection data in the second scanning direction, wherein the second scanning direction is opposite to the first scanning direction, characterized in that extracting corresponding equivalent projection data in a second scanning direction from corresponding projection data in a first direction range of a first scanning direction comprises: for each scanning direction of a plurality of scanning directions in the first direction range, extracting corresponding line projection data of one ray sub-beam from corresponding projection data in the scanning direction, wherein the ray sub-beam is a collection of rays of the ray beam emitted from the radiographic source in the scanning direction, with the included angle between the projection of the rays on the plane of the gantry and the plane where the scanning table is located within a preset angle range, and re-sorting the extracted line projection data to obtain the equivalent projection data. extracting corresponding equivalent projection data in a second scanning direction from corresponding projection data in a first direction range of a first scanning direction and inserting the equivalent projection data into corresponding projection data in the second scanning direction, wherein the second scanning direction is opposite to the first scanning direction, characterized in that extracting corresponding equivalent projection data in a second scanning direction from corresponding projection data in a first direction range of a first scanning direction comprises: for each scanning direction of a plurality of scanning directions in the first direction range, extracting corresponding line projection data of one ray sub-beam from corresponding projection data in the scanning direction, wherein the ray sub-beam is a collection of rays of the ray beam emitted from the radiographic source in the scanning direction, with the included angle between the projection of the rays on the plane of the gantry and the plane where the scanning table is located within a preset angle range, and re-sorting the extracted line projection data to obtain the equivalent projection data. for each scanning direction of a plurality of scanning directions in the first direction range, extracting corresponding line projection data of one ray sub-beam from corresponding projection data in the scanning direction, wherein the ray sub-beam is a collection of rays of the ray beam emitted from the radiographic source in the scanning direction, with the included angle between the projection of the rays on the plane of the gantry and the plane where the scanning table is located within a preset angle range, and re-sorting the extracted line projection data to obtain the equivalent projection data.