A system and method for delivering radiation therapy to a patient includes generating a radiation therapy plan and adjusting a shape of at least one of a plurality of multi-leaf collimators (MLCs) arranged in an arc about a patient bed to create a respective plurality of desired beam profiles for each of the plurality of MLCs to thereby implement the ultrafast radiation therapy plan delivery. The method further includes control a radiation therapy source to execute the radiation therapy plan by creating the respective plurality of desired beam profiles for each of the plurality of MLCs.

The present invention provides a radiotherapeutical or radiosurgical system comprising at least two high-intensity radiation sources configured to rotate around a common rotation axis and a ring-shaped imaging device. A three-source configuration is considered as the most cost-effective and will be used as an example for illustration. The three radiation sources are specially configured with each radiation source emits a radiation beam having an angle (α1, α2 or α3 respectively) relative to the common rotation axis and targets at a common isocenter. During a radiation treatment, the angles α1, α2 and α3 are independently of each other constant or variable with a magnitude of less than ±15°, and it always remains that α1≠α2, α1≠α3, and α2≠α3. The special configuration of these high-intensity radiation sources and use of a unique compact MLC for each of the radiation sources make it possible for the system to rapidly deliver high-conformal non-coplanar stereotactic radiation treatment in one gantry rotation without any couch rotation. Consequently, a ring-shaped imaging device, which does not allow couch rotation, can be integrated into the system to provide high-precision image guidance. Therefore, the present invention can deliver high precision and high-conformal non-coplanar stereotactic radiation treatment to any part of the body in an extremely short time (0.1-20 seconds), which may exhibit numerous advantages over the prior art, such as reduction of radiation damage to the circulating immune cells in blood and mitigation of patient motion-induced problems, among others.

The present disclosure may provide a radiation system including a first rotation portion, a second rotation portion, a treatment head, one or more imaging sources, and at least one detector. At least a portion of the treatment head may be disposed in the first rotation portion. At least one of the one or more imaging sources may be disposed in the second rotation portion. The second rotation portion may be able to rotate independently from the first rotation portion.

A radiation delivery system and method of operation are described. The method includes modulating 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, and delivering a plurality of independent two-dimensional (2D) sub-beam intensity patterns from a plurality of angles while the radiation source is moved continuously.

A radiation therapy system is capable of widening a radiation irradiation range to a patient and includes: a radiation source; a rotation mechanism that supports the radiation source in rotation around an isocenter; a couch that places a therapy target site of a patient at the isocenter; a head swing mechanism that is disposed between the radiation source and the rotation mechanism and that swings an irradiation axis of a radiation emitted from the radiation source by swinging the radiation source; and a controller. The controller holds the head swing mechanism in a state where the irradiation axis of the radiation of the radiation source is shifted from the isocenter in a predetermined direction by a predetermined amount, and rotates the radiation source by the rotation mechanism while emitting the radiation from the radiation source while maintaining the state of the head swing mechanism.

A computing system comprising a central processing unit (CPU), and memory coupled to the CPU and having stored therein instructions that, when executed by the computing system, cause the computing system to execute operations to generate a radiation treatment plan. The operations include accessing a minimum prescribed dose to be delivered into and across the target, determining a number of beams and directions of the beams, and determining a beam energy for each of the beams, wherein the number of beams, the directions of the beams, and the beam energy for each of the beams are determined such that the entire target receives the minimum prescribed dose. The operations further include prescribing a dose rate and optimizing dose rate constraints for FLASH therapy, and displaying a dose rate map of the FLASH therapy.

Disclosed herein is a radiation head for a radiotherapy device. The radiation head comprises a source of radiation configured to emit a beam of radiation; and beam shaping device for collimating the beam of radiation. The beam shaping device comprises a multi-leaf collimator; and a diaphragm positioned between the source and the multi-leaf collimator. The diaphragm comprises a diaphragm block movable along a curved path, the diaphragm block having a flat face focused on a focus point which is offset from the source of radiation.

Systems and methods for determining beam asymmetry in a radiation treatment system using electronic portal imaging devices (EPIDs) without implementation of elaborate and complex EPID calibration procedures. The beam asymmetry is determined based on radiation scattered from different points in the radiation beam and measured with the same region of interest ROI of the EPID.

A method of measuring a rotational position of an assembly with circumferential ferromagnetic teeth includes applying an excitation signal for a cycle to an actuator, the cycle causing a first rotational displacement of a first ferromagnetic tooth from a first rotational position to a second rotational position and a second rotational displacement of a second ferromagnetic tooth from the second rotational position to a third rotational position. The method further includes measuring a plurality of first signal outputs from a magnetoresistive sensor during the cycle; determining one or more signal offset values based on the plurality of first signal outputs; applying the signal excitation for a portion of a second cycle to the actuator; measuring second signal outputs from the magnetoresistive sensor; generating corrected signals by modifying the second signal outputs with the signal offset values; and, based on the corrected signals, determining a rotational position of the assembly.

A radiation treatment session is initiated to deliver a therapeutic radiation beam from a therapeutic radiation source to a target. One or more X-ray radiation sources are caused to deliver an imaging radiation beam from the one or more X-ray radiation sources through the target to one or more X-ray detectors to acquire imaging data associated with the target during therapeutic radiation beam delivery. One or more volumetric images are constructed using the acquired imaging data.