Positioning method for use in image-guided radiotherapy

Abstract

The invention provides a positioning method for use in image-guided radiotherapy, which comprises the following: a step of input, which is to input a radiotherapy plant image; a step of imaging, which is o acquire the image data of a patient by using KV-grade X-rays and acquire the image of a patient according to the image data; a step of registering, which is to register the image of the patient with the radiotherapy plant image; a step of judging, which to judge whether the positions of the two images are consistent according to the registration results, and execute a step of treatment if the positions of the two images are consistent or execute a step of regulation if the positions of the two images are inconsistent; a step of treatment, which is to treat the patient by using an MV-grade X-rays, wherein the KV-grade X-rays and the MV-grade X-rays are from the same accelerating tube; and the step of regulation, which is to regulate the position of a patient according to the registration result and return to the step of imaging. The positioning method is used for improving the positioning accuracy of image-guided radiotherapy.

Description

technical field [0001] The invention relates to the technical field of radiotherapy, in particular to a positioning method for image-guided radiotherapy. Background technique [0002] Image-guided radiotherapy (IGRT, image-guided radiotherapy) combines the radiation therapy machine and imaging equipment to collect relevant image information during treatment, determine the position and movement of the treatment target area and important structures, and perform positioning when necessary. and dose distribution correction; the IGRT technique can be used to acquire images and / or other signals during fractional treatment setup and / or treatment, and use these images and / or signals to guide this treatment and / or follow-up Fractional treatment. [0003] Among the many factors affecting the therapeutic effect, the positioning of the patient, the determination of the position of the target area, and the control of the patient's movement (involuntary movement, target area movement dri...

AI Technical Summary

Problems solved by technology

[0010] This mode generally directly adopts an online image verification system composed of MV-level X-rays for treatment and digital imaging boards installed at the relative position of the treatment head; its advantage is that the imaging rays and treatment rays have the same source, so they also pass through the same head structure , the verification image can well reflect the patient's body position error, the relationship between the target area and surrounding organs and the treatment irradiation field, etc.; but because the MV-level rays used in it mainly have Compton scattering effect in human tissue, the bone structure The absorption difference from soft tissue is relatively small, and the tissue contrast and density resolution of the image are relatively poor, so its imaging effect is far worse than that of KV-level X-ray images, which also affects the positioning accuracy of image-guided radiotherapy

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