Moving-body tracking device for radiation therapy, irradiation region determining device for radiation therapy, and radiation therapy device

Abstract

The location of the tumor in the patient changes according to the breathing of the patient. Radiography of the region containing the tumor is performed at a number of different respiratory phases. The X-ray image deformation calculation unit (14) of the device calculates deformation vectors of other images with respect to the reference image by performing nonlinear registration between images in the reference respiratory phase and images in other respiratory phases. A position calculating unit (15) calculates data indicating the position of the tumor in each respiratory phase by applying a deformation vector to the data indicating the position of the tumor in the reference respiratory phase. On the other hand, a template matching unit (16) recognizes a region (83) matching a template image (81a-81n) including a tumor image (M) in an image (82) at each respiratory phase. The template matching unit (16) thus calculates data indicating the position of the tumor in each respiratory phase. The error of the output of the template matching unit (16) relative to the output of the position calculation unit (15) is obtained. Optimizing the parameters for template matching makes the error small.

Description

technical field [0001] The present invention relates to a radiotherapy moving object tracking apparatus, a radiotherapy irradiation area determination apparatus, and a radiotherapy apparatus for radiotherapy in which treatment is performed by irradiating a patient with a therapeutic beam. Here, the moving object tracking device refers to a device that tracks the position of a moving object by tracking a moving object, which is a moving object that moves along with a patient's respiration or the like, by target tracking of a target. Background technique [0002] In radiation therapy in which radiation such as X-rays and electron beams are irradiated to an affected part such as a tumor, it is necessary to irradiate the affected part with radiation accurately. However, the affected part may move along with the patient's breathing. For example, tumors near the lungs move significantly due to breathing. Therefore, there has been proposed a radiation therapy apparatus having a s...

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Problems solved by technology

However, sometimes the affected part moves as the patient breathes

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