Delivering independent 2D sub-beam intensity patterns from moving radiation source

A radiation delivery system, comprising:

• a mechanism to move about a target;
• a radiation source mounted to the mechanism to generate a radiation beam;
• and
• a processing device operatively coupled with the mechanism and the radiation source, the processing device to control modulation of a sub-beam intensity of the radiation beam across a plurality of sub-beams that subdivide a fluence field into a two-dimensional (2D) grid, wherein the processing device controls modulation of the sub-beam intensity based on an open-time profile for each sub-beam of the plurality of sub-beams of the 2D grid positioned across an entire direction of travel for each of a plurality of leaf pairs, and wherein a plurality of independently generated two-dimensional (2D) sub-beam intensity patterns are delivered from a plurality of angles while the radiation source is moved continuously based on the open-time profile, wherein a leaf motion profile associated with the open-time profile provides the sub-beam intensity pattern for each of the 2D sub-beam intensity patterns within a single discrete positional section associated with an angle of the plurality of angles for providing the corresponding 2D sub-beam intensity pattern, and wherein the open-time for each sub-beam of each 2D sub-beam intensity pattern is adjusted to provide a total leaf open-time that is less than a discrete time interval corresponding to a time for the radiation source to traverse the single discrete positional section associated with the angle of the plurality of angles.

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:

• modulate, by the processing device, a sub-beam intensity of a radiation beam generated by a radiation source across a plurality of sub-beams that subdivide a fluence field into a two dimensional (2D) grid based on an open-time profile determined for each sub-beam of the plurality of sub-beams of the 2D grid positioned across an entire direction of travel for each of a plurality of leaf pairs;
• and
• deliver a plurality of independently generated two-dimensional (2D) sub-beam intensity patterns from a plurality of angles while the radiation source moves continuously based on the open-time profile, wherein a leaf motion profile associated with the open-time profile provides the sub-beam intensity pattern for each of the 2D sub-beam intensity patterns within a single discrete positional section associated with an angle of the plurality of angles for providing the corresponding 2D sub-beam intensity pattern, and wherein an open-time for each sub-beam of each 2D sub-beam intensity pattern is adjusted to provide a total leaf open-time that is less than a discrete time interval corresponding to a time for the radiation source to traverse the single discrete positional section associated with the angle of the plurality of angles.