Rapid three-dimensional dose reconstruction method and system for particle beam therapy

The invention discloses a rapid three-dimensional dose reconstruction method and system for particle beam therapy, and the method comprises the steps: obtaining a first beam parameter of a particle beam during the therapy of a patient, comparing the first beam parameter with a plurality of beam parameters of a dose distribution database, if the same beam parameter is matched, dose distribution data corresponding to the first beam parameter is selected as first dose distribution data, and if the same beam parameter is not matched, multiple pieces of dose distribution data in a dose distribution database are processed according to the first beam parameter to obtain second dose distribution data; and performing tissue density correction on the first or second dose distribution data to obtain third dose distribution data. According to the invention, on the basis of the actually measured dose distribution database, dose reconstruction calculation is directly carried out by monitoring the peak position depth, the b