Abstract: The present disclosure relates to systems and methods for reconstructing fluence map. The system may obtain a plurality of radiation tasks based on a radiotherapy plan. Each of the plurality of radiation tasks may include a radiation field corresponding to the radiation task. For each of the plurality of radiation tasks, the system may determine whether a shape change between a radiation field corresponding to the radiation task and a radiation field corresponding to a preceding radiation task exceeds a shape change threshold. The system may determine a fluence map corresponding to the radiation task based on a first determination result of whether the shape change between the radiation field corresponding to the radiation task and the radiation field corresponding to the preceding radiation task exceeds the shape change threshold.

Abstract: The embodiments of the present disclosure provide a system for determining a radiation dose. The system may include: obtaining data related to radiation source, a radiation auxiliary image of a target object at a target radiation time point, and an initial fluence map corresponding to the target radiation time point; determining a target fluence map corresponding to the target radiation time point by one or more iterations based on the radiation auxiliary image, the initial fluence map, and the data related to radiation source; obtaining a target scanning image of the target object; and determining the radiation dose received by the target object at the target radiation time point, based on the target fluence map, the target scanning image, and the data related to radiation source.

Abstract: The present disclosure relates to systems and methods for reconstructing fluence map. The system may obtain a plurality of radiation tasks based on a radiotherapy plan. Each of the plurality of radiation tasks may include a radiation field corresponding to the radiation task. For each of the plurality of radiation tasks, the system may determine whether a shape change between a radiation field corresponding to the radiation task and a radiation field corresponding to a preceding radiation task exceeds a shape change threshold. The system may determine a fluence map corresponding to the radiation task based on a first determination result of whether the shape change between the radiation field corresponding to the radiation task and the radiation field corresponding to the preceding radiation task exceeds the shape change threshold.