Device and method for positioning a target volume in radiation therapy apparatus
First Claim
1. A device for positioning a target in a patient in a radiation therapy apparatus, the apparatus directing a radiation beam towards the target, the device comprising:
- a target support for immobilizing the target;
a two-dimensional radiation detector fixed with fixation device in a predetermined geometric relationship to the target support, the two-dimensional radiation detector configured to detect an intersection position of the radiation beam with the detector; and
correcting device configured to correct a relative position of the beam and the target support, based on the detected intersection position;
wherein the fixation device comprises fixation frames affixed to the target support, the two-dimensional radiation detector located in close proximity to the target.
1 Assignment
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Accused Products
Abstract
Device for positioning a target volume (112) such, as a phantom or a patient in a radiation therapy apparatus, said apparatus directing a radiation beam (405) towards said target (112), characterized in that it comprises:—a target support (100) whereon the target is immobilized; a two dimensional radiation detector (103) fixed with fixations means (101, 102, 104, 106 107; 301, 302, 304, 305, 306; 208, 209) in a known geometric relationship to said target support (100), said radiation detector (103) being capable of detecting the position of intersection of said radiation beam (105) with said detector (103); correcting means for correcting the relative position of said beam (105) and said target support 100), based on said detected intersection position.
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Citations
11 Claims
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1. A device for positioning a target in a patient in a radiation therapy apparatus, the apparatus directing a radiation beam towards the target, the device comprising:
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a target support for immobilizing the target; a two-dimensional radiation detector fixed with fixation device in a predetermined geometric relationship to the target support, the two-dimensional radiation detector configured to detect an intersection position of the radiation beam with the detector; and correcting device configured to correct a relative position of the beam and the target support, based on the detected intersection position; wherein the fixation device comprises fixation frames affixed to the target support, the two-dimensional radiation detector located in close proximity to the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for positioning a target in a patient in a radiation therapy apparatus, comprising:
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determining a relative position between the target and a two-dimensional radiation detector; providing a fixation device configured to fix the relative position during the subsequent steps; determining an intended intersection point of the radiation beam with the two-dimensional radiation detector; directing a sub-therapeutic radiation beam towards the two-dimensional radiation detector and determining an actual intersection point of the beam with the two-dimensional radiation detector; computing a correction vector which is a difference between locations of the intended and the actual intersection points; and applying a correction to a relative position between the radiation beam and the two-dimensional radiation detector, whereby the actual intersection point coincides with the intended intersection point; wherein determining the relative position of the target and the two-dimensional radiation detector comprises; providing a two-dimensional radiation detector having three or more points for fixation to a target support, the points having a geometric relationship with the two-dimensional radiation detector; installing the target in a fixed way on a target support; providing markers on the target support at fixation points of the two-dimensional radiation detector, the markers being visible in an imaging modality; obtaining an image of the target using an imaging modality where both the target and the markers are visible; determining from the image the geometric relationship of the target and the markers; and inferring therefrom the geometric relationship between the target and the two-dimensional radiation detector. - View Dependent Claims (10, 11)
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Specification