Location mark based radiotherapy positioning method

Abstract

The invention provides a location mark based radiotherapy positioning method. The method includes the following steps: a step of a radiotherapy planning phase, namely the step of determining locationmark pasting points at the periphery of a target radiotherapy target area, respectively pasting a first location mark at each location mark pasting point, adopting a CT system to scan a target radiotherapy object, and removing the first location marks after obtaining the target radiotherapy object CT images of mark points with the first location marks; and a step of a radiotherapy implementation phase, namely the step of respectively pasting a second location mark at each location mark pasting point, adopting an image guiding and positioning system to scan the target radiotherapy object, obtaining the target radiotherapy object guiding and positioning images of the mark points with the second location marks, performing registration on the target radiotherapy object CT images and the targetradiotherapy object guiding and positioning images based on the mark points of the first location marks and the mark points of the second location marks so that the positioning deviation of patientscan be obtained, and adjusting the positioning of the patients based on the positioning deviation. Thus, the accurate registration positioning of the target radiotherapy object guiding and positioningimages and the target radiotherapy object CT images during radiotherapy can be realized.

Description

technical field [0001] The invention relates to the medical field, in particular to a radiotherapy positioning method based on a positioning mark. Background technique [0002] Image-guided positioning technology is the core key technology of image-guided radiation therapy (IGRT), which uses the image features of the patient's internal anatomy or metal markers to verify and adjust the patient's position. [0003] IGPS image-guided radiotherapy positioning system is one of the realization methods of image-guided positioning technology. The IGPS system uses kilovolt-level X-ray stereoscopic imaging technology to obtain X-ray projection images in two directions, and uses the image features of the patient's internal anatomy or metal markers to verify and adjust the patient's position. [0004] Taking the positioning of breast tumors as an example, in the prior art, the image-guided positioning method includes the following steps: 1. The patient performs normal initial positioni...

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Problems solved by technology

[0006] Using the spine bony markers as the reference for positioning, since the target area is located in the mammary gland and there is a relatively large distance (10cm-20cm) from the spine, it is easy to have accurate positioning of the spine and a large deviation in the mammary gland. treatment effect

[0007] Using the rib bony mark as a reference for positioning, because the features of the ribs are not obvious enough under X-ray imaging, it will increase the workload of the operator's visual inspection and affect work efficiency

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