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Local area accurate deformation registration algorithm combining point registration

A registration algorithm and local area technology, applied in computing, image data processing, instruments, etc., to achieve the effect of improving accuracy, improving registration accuracy, and high registration accuracy

Inactive Publication Date: 2015-05-06
CANCER CENT OF GUANGZHOU MEDICAL UNIV
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Problems solved by technology

However, the accuracy of these registration algorithms is only related to the algorithm model. The accuracy of registration is global and has nothing to do with a specific anatomical structure in the image to be registered. Registration Accuracy in Region of Interest

Method used

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  • Local area accurate deformation registration algorithm combining point registration
  • Local area accurate deformation registration algorithm combining point registration
  • Local area accurate deformation registration algorithm combining point registration

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Experimental program
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specific Embodiment

[0085] Read into CT 1 Image and CT 2 image, CT 2 is the floating image, CT 2 as a reference image. This example is two sets of CT images obtained during the high dose rate brachytherapy of a cervical cancer patient. When the patient receives high dose rate brachytherapy, the applicator needs to be placed in the vagina, and the CT 1 Image and CT 2 The image is the CT image after the applicator is removed by manual segmentation, and the CT value of air (-1000HU) is assigned to this area. The purpose is to match the shape of the two CT images through deformation registration, and make the source Higher registration accuracy can be obtained in the adjacent area of ​​the device (the adjacent area is the high-dose area). Both images have a resolution of 256×256×54. CT 1 Image and CT 2 The three-dimensional point sets of the contour line of the segmented applicator area in the image are respectively v → a ...

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Abstract

The invention discloses a local area accurate deformation registration algorithm combining point registration. The local area accurate deformation registration algorithm is characterized in that the feature-based point registration method is combined with the intensity-based image registration method, especially the result of point registration is converted to a deformation field through a spline model, the deformation field serves as a follow-up initial deformation field of intensity-based image registration, and thus the two different registration methods are combined. The local area accurate deformation registration algorithm combining point registration ingeniously makes use of the characteristic of high registration accuracy of point registration, improves the registration accuracy of areas of interest, accordingly improves accuracy of illuminated accumulated dose, and achieves accuracy interference, regulation and control on registration of local areas in the images. The local area accurate deformation registration algorithm combining point registration can be widely applied to the field of image deformation registration.

Description

technical field [0001] The invention relates to image deformation registration, in particular to a local region accurate deformation registration algorithm combined with point registration. Background technique [0002] In conventional radiotherapy, the patient's computed tomography (CT, Computed Tomography) image obtained for the first time is used as a planning image, and only the planned CT image is used to generate a treatment plan to implement treatment on the patient. But in fact, in each fractionated treatment, the patient's internal anatomical structure will change, such as the error of the technician's positioning, the peristalsis of the patient's internal organs, and the tumor will shrink with the progress of radiotherapy. Planning and implementing radiation therapy will inevitably lead to serious dose errors and may involve normal tissue into high-dose areas. Adaptive radiotherapy (ART, Adaptive Radiotherapy) technology can solve the above problems. ART technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00A61B6/03
CPCG06T2207/10081G06T2207/30096
Inventor 王琳婧张书旭甄鑫邱慧芝林生趣
Owner CANCER CENT OF GUANGZHOU MEDICAL UNIV
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