Target tracking device and radiation therapy apparatus
AssigneeNational University Corporation Hokkaido University
InventorMasayori Ishikawa
Life of this patent
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Abstract
A target tracking device for tracking a moving target, based on X-ray fluoroscopic images from a plurality of directions, the target tracking device may include a plurality of X-ray fluoroscopic devices, an image processing unit, and a position determining unit. The X-ray fluoroscopic devices obtain a plurality of images from a plurality of directions, each of the images in a given direction having a different sensitivity. The image processing unit identifies a position of a target image based on pattern matching between the plurality of images and an image of the target. The position determining unit determines a 3D position of the target based on the position of the target image in the plurality of images from the plurality of directions.
Claims8
A method for tracking a moving target, comprising:
- repeating for each of a plurality of directions:
- obtaining a plurality of X-ray fluoroscopic images from a plurality of fluoroscopic devices, wherein each of the plurality of X-ray fluoroscopic images has different sensitivity for X-ray;
- performing pattern matching between an image of the target and each of the plurality of X-ray fluoroscopic images to identify a target image in each of the plurality of X-ray fluoroscopic images;
- identifying the target image with a highest pattern matching score;
- determining a two-dimensional position of the target based on a position of the target image with the highest pattern matching score;
- determining a three-dimensional position of the target based on the two-dimensional position of the target for each of the plurality of directions;
- repeating the determining a three-dimensional position of the target to thereby track the target.
A target tracking device for tracking a moving target comprising:
- a plurality of X-ray fluoroscopic devices configured to obtain a plurality of X-ray fluoroscopic images from each of a plurality of directions, wherein each of the plurality of X-ray fluoroscopic images in one direction of the plurality of directions has different sensitivity for X-ray;
- an image processing unit configured to, for each direction of the plurality of directions:
- perform pattern matching between an image of the target and each of the plurality of X-ray fluoroscopic images to identify a target image in each of the X-ray fluoroscopic images,
- identify the target image with a highest pattern matching score;
- determine a two-dimensional position of the target based on a position of the target image with the highest pattern matching score;
- and
- a position determining unit configured to determine a 3D position of the target, based on the two-dimensional position of the target for each of the plurality of directions,
- wherein the 3D position of the target is repeatedly determined to thereby track the target.
Dependencies are inferred from the claim text.