Systems and methods for modeling radiation source

A system, comprising:

• a storage device storing a set of instructions for determining a dose distribution in an object subject to radiation of an energy spectrum from a radiation source, the radiation source including a primary source and an electron applicator;
• and
• at least one processor in communication with the storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to perform operations including:
• obtaining structural parameters of the electron applicator;
• obtaining a target multi-source model of the radiation source corresponding to the energy spectrum;
• determining, based on the target multi-source model and the structural parameters of the electron applicator, a phase space file including information of a plurality of simulated particles corresponding to the radiation;
• obtaining a transport model of the radiation of the energy spectrum traversing the object;
• and
• determining the dose distribution in the object based on the phase space file and the transport model.

A method for determining a dose distribution in an object subject to radiation of an energy spectrum from a radiation source, the radiation source including a primary source and an electron applicator, the method comprising:

• obtaining structural parameters of the electron applicator;
• obtaining a target multi-source model of the radiation source corresponding to the energy spectrum;
• determining, based on the target multi-source model and the structural parameters of the electron applicator, a phase space file including information of a plurality of simulated particles corresponding to the radiation;
• obtaining a transport model of the radiation of the energy spectrum traversing the object;
• and
• determining the dose distribution in the object based on the phase space file and the transport model.

A system, comprising:

• a storage device storing a set of instructions for modeling a radiation source configured to emit radiation of an energy spectrum that includes a plurality of energy levels;
• and
• at least one processor in communication with the storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to perform operations including:
• obtaining an initial source model of the radiation source, wherein the initial source model includes an initial phase space file;
• estimating, based on the initial phase space file, a plurality of component percentage depth-dose (PDD) curves in a phantom;
• obtaining a measured PDD curve in the phantom corresponding to the radiation of the energy spectrum traversing the phantom;
• for each of the plurality of energy levels, determining a weight, based on the plurality of component PDD curves and the measured PDD curve;
• and
• determining a target source model of the radiation source corresponding to the energy spectrum based at least in part on the initial source model and the weights.