The present disclosure generally relates to an applicator for radiotherapy and a method for determining a thickness of a scattering foil and modulator therein. According to one embodiment, an applicator for radiotherapy may comprise a housing having a hollow structure with an opening, a scattering foil disposed at an opening of the hollow structure and configured to receive a first radiation and convert a portion of the first radiation into a second radiation while scattering the first radiation, and a modulator disposed inside the hollow structure and configured to modulate an intensity of mixed radiation including the first radiation and the second radiation.

An x-ray imaging apparatus and associated methods are provided to execute multi-pass imaging scans for improved quality and workflow. An imaging scan can be segmented into multiple passes that are faster than the full imaging scan. Data received by an initial scan pass can be utilized early in the workflow and of sufficient quality for treatment setup, including while the another scan pass is executed to generate data needed for higher quality images, which may be needed for treatment planning. In one embodiment, a data acquisition and reconstruction technique is used when the detector is offset in the channel and/or axial direction for a large FOV during multiple passes.

In a radiation treatment plan that includes a plurality of treatment fields of multiple treatment modalities, such as IMRT modality and dynamic treatment path modality (e.g., VMAT and conformal arc therapy), an optimized spatial point sequence may be determined that optimizes the total treatment time, which includes both the beam-on time (i.e., during the delivery of radiation dose) and the beam-off time (i.e., during transitions between consecutive treatment fields). The result is a time-ordered field trajectory that intermixes and interleaves different treatment fields. In one embodiment, a dynamic treatment path may be cut into a plurality of sections, and one or more IMRT fields may be inserted between the plurality of sections.

A multi-mode cone beam computed tomography radiotherapy simulator and treatment machine is disclosed. The radiotherapy simulator and treatment machine both include a rotatable gantry on which is positioned a cone-beam radiation source and a flat panel imager. The flat panel imager captures x-ray image data to generate cone-beam CT volumetric images used to generate a therapy patient position setup and a treatment plan.

An implantable device has a body that is substantially rigid and has a predetermined shape. The body is further bioabsorbable and has a density less than or equal to about 1.03 g/cc. When the device is implanted in a resected cavity in soft tissue, it causes the cavity to conform to the predetermined shape. The implantable device is further imageable due to its density being less than that of soft tissue such that the boundaries of the tissue corresponding to the predetermined shape can be determined.

Systems, devices, and methods for imaging-based calibration of radiation treatment couch position compensations.

A method for focusing an X-ray method is provided and the method includes: emitting an electron beam by an electron beam generator; shooting the electron beam onto a target to generate an X-ray beam; and causing the X-ray beam to pass through each collimating channel of a same collimating channel group of a collimator to focus on a focus of the collimating channel group. The collimator includes at least one collimating channel group. Each collimating channel group includes at least two collimating channels. The same collimating channel group has one focus or a plurality of focuses.

An x-ray imaging apparatus and associated methods are provided to receive measured projection data in a primary region and measured scatter data in asymmetrical shadow regions and determine an estimated scatter in the primary region based on the measured scatter data in the shadow region(s). The asymmetric shadow regions can be controlled by adjusting the position of the beam aperture center on the readout area of the detector. Penumbra data may also be used to estimate scatter in the primary region.

The present disclosure relates to a motion guidance assembly for guiding the motion of a collimator device. The motion guidance assembly may include a first pair of flexible plates connected to the collimator device. The first pair of flexible plates may be deformable in a direction perpendicular to an opening of the collimator device. A deformation of the first pair of flexible plates may guide the motion of the collimator device based on a driving force.

A radiation therapy device includes an electron beam source (EBS) for generating an electron beam and a steering device for directing the electron beam. A target is disposed a predetermined distance from the EBS and is positioned to intercept the electron beam. The target element generates x-ray photons upon the impact of electrons with the target. A focusing lens is coupled to and spaced from the target by no more than 10 mm, and is positioned to receive x-ray photons generated by the target. The focusing lens focuses the x-ray photons to a focal point. The radiation therapy device can also include targets configured to generate x-ray beams for tomosynthesis. A method for performing radiation therapy is also disclosed.