Radiation treatment planning and delivery using collision free regions

A computer product comprising a non-transitory computer readable medium storing a plurality of instructions that when executed control a computer system to determine a radiation treatment plan for delivering radiation to a patient using an external-beam radiation treatment system, the instructions comprising:

• receiving one or more class solutions, wherein each class solution includes field geometry limits for one or more treatment axes of the external-beam radiation treatment system and a corresponding collision free region, and wherein the collision free region comprises a three-dimensional space for allowed initial isocenter positions determined based on a model of a delivery machine and a patient model;
• receiving a three-dimensional image of the patient;
• aligning the three-dimensional image of the patient with the collision free regions of the one or more class solutions;
• receiving a desired initial isocenter position;
• receiving a user selection of one or more treatment fields of the one or more class solutions;
• comparing the desired initial isocenter position with the collision free regions of the one or more class solutions to determine whether the desired initial isocenter position is within at least one collision free region of the one or more class solutions;
• in response to determining that the desired initial isocenter position is within at least one collision free region of the one or more class solutions, identifying a subset of the one or more user-selected treatment fields that are within field geometry limits of the class solution corresponding to the at least one of the collision free regions;
• and
• determining the radiation treatment plan using the subset of the one or more user-selected treatment fields.

A radiation therapy system comprising:

• a radiation therapy device including:
• a rotatable gantry including a treatment head and a multileaf collimator, wherein the multileaf collimator is configured to shape a radiation beam emitted from the treatment head;
• and
• a control unit configured to:
• control rotation of the rotatable gantry;
• control emission of the radiation beam from the treatment head;
• and
• control a shape of the radiation beam via the multileaf collimator;
• one or more processors communicatively coupled to the radiation therapy device;
• and
• a non-transitory computer readable medium storing a plurality of instructions that when executed control the one or more processors and the radiation therapy device to deliver radiation to a patient, the instructions comprising:
• receiving one or more class solutions, wherein each class solution includes field geometry limits for one or more treatment axes of radiation therapy device and a corresponding collision free region, and wherein the collision free region comprises a three-dimensional space for allowed couch coordinates determined based on a model of a delivery machine and a patient model;
• receiving a radiation treatment plan including one or more treatment fields;
• acquiring, by the radiation therapy device, a three-dimensional image of the patient;
• positioning, by the radiation therapy device, the patient based on the three-dimensional image of the patient to obtain an actual couch coordinate;
• comparing the actual couch coordinate with the collision free regions of the one or more class solutions to determine whether the actual couch coordinate is within at least one collision free region of the one or more class solutions;
• and
• preventing execution of the radiation treatment plan or executing the radiation treatment plan based on whether the actual couch coordinate is within at least one collision free region.