33 results about "Stereotactic radiotherapy" patented technology

A fiducial marker system (210a-c) comprises a first unit and a second unit. The first unit is patient affixable and comprises a partly spherical inner surface having a first center point that is adapted to receive a touch probe measurement head for measuring the spatial position of the center point. The second unit is releasably attachable to an outer surface of the first unit, and has a second center point, wherein the first center point and the second center point are substantially identical when the second unit is attached to the first unit. For stereotactic therapy, a patient is imaged with the first and second unit assembled. Then the second unit is detached. A stereotactic frame (300) is attached to the first units via arms. Thus frameless imaging is provided in a frame based stereotactic surgery system with high precision. Repeated assembly of the frame (300) to the first units, remaining in the patient, provides advantageous fractionized stereotactic radiotherapy.

A radiotherapy system including a radiation source operable to produce a radiation beam towards a target, an orientation changer operable to change a relative position of the radiation source with respect to the target, and a multileaf attenuator including attenuating leaves including respective spatially varying attenuation properties and a positioner in communication with the orientation changer, each of the attenuating leaves having a leaf length, leaf thickness, leaf center and leaf direction, wherein the leaf direction is a line intersecting the leaf center along the leaf thickness, wherein the radiation beam includes one or more beam segments, wherein a beam segment is the part of the beam intercepted by one of the attenuating leaves, and wherein the target includes one or more target segments, wherein a target segment is that part of the target that intercepts a corresponding one of the beam segments, wherein each of the attenuating leaves is operative to modulate an intensity of a corresponding beam segment by selective attenuation of the leaf thickness along the leaf length, and wherein the positioner is operable to vary at least one of a leaf center position and a leaf direction relative to the radiation source in accordance with positions of the corresponding target segment and the radiation source.

The invention discloses a radiotherapy device for stereo positioning of a head. An X-ray transmitter and a digital image detection panel are integrated on an accelerator, a three-dimensional image of a patient can be quickly obtained through a cone beam computed tomography (CBCT) function, and after the three-dimensional image is obtained, software quickly locates tumor coordinates in a data set on isocenters through an algorithm; and because the technical scheme is unique in structure, the three-dimensional image of the patient can be quickly obtained through only rotating the CBCT for 120 degrees, the consumed time is short, so a plurality of groups of three-dimensional images of the patient can be obtained during a time period, tumor position variations which are caused by breathing movement can be recorded in the plurality of groups of images, the tumor positions (registration) of the plurality of three-dimensional images are compared through the algorithm, and a four-dimensional plan is designed in a radio therapy planning system according to the displacement differences of the images groups.