Binary multileaf collimator delivery with per-leaf field width

A radiation treatment delivery system, comprising:

• a linear accelerator (LINAC) to output a radiation beam at a distal end;
• a multileaf collimator (MLC), coupled with the distal end of the LINAC, wherein the MLC has two banks of leaves, organized into a plurality of opposing leaf pairs;
• and
• a processing device, operatively coupled to the LINAC and the MLC, to:
• control the plurality of leaf pairs of the MLC such that for each of a plurality of radiation beam delivery positional sections corresponding to a range of radiation beam positions over a discrete time interval, wherein each leaf pair of the plurality of opposing leaf pairs is open to a fixed opening for a fraction of time in the discrete time interval and closed for the remaining fraction of time in the discrete time interval, while the radiation beam of the radiation treatment system is active, wherein the discrete time interval is based on an average open-time and a modulation factor.

A non-transitory computer readable medium comprising instructions that, when executed by a processing device of a radiation treatment delivery system, cause the processing device to:

• generate a plurality of radiation beam delivery positional sections to contain MLC leaf control instructions while a radiation beam is active, wherein each of the plurality of radiation beam delivery positional sections corresponds to a range of radiation beam positions over a discrete time interval, wherein the discrete time interval is based on an average open-time and a modulation factor;
• generate a plurality of openings for each of the plurality of radiation beam delivery positional sections, each of the plurality of openings corresponding to one of a plurality of leaf pairs of the MLC;
• generate a plurality of leaf open-time fractions for each of the plurality of radiation beam delivery positional sections, each of the plurality of leaf open-time fractions corresponding to one of the plurality of leaf pairs of the MLC;
• and
• control, by the processing device, the plurality of leaf pairs of the MLC such that each leaf pair of the plurality of leaf pairs is opened to a corresponding opening of the plurality of openings for a corresponding leaf open-time fraction of the plurality of leaf open-time fractions during the discrete time interval corresponding to the range of radiation beam positions, while the radiation beam of the radiation treatment system is active.