A 2d-3d Image Registration Algorithm

A 2D-3D, imaging technology, applied in the field of surgical navigation, can solve problems such as time-consuming, inability to obtain accurate results, and affect the application of algorithms, and achieve the effect of accurate registration results

Active Publication Date: 2021-02-26
NANJING TUODAO MEDICAL TECHNOLOGY CO LTD
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Problems solved by technology

Since the target variable has 6 degrees of freedom (3 of which represent rotation and the other 3 represent translation), the traditional similarity evaluation algorithm based on template matching or the algorithm based on random sampling search cannot obtain accurate results, and it is very consuming , which affects the application of the algorithm in the actual scene

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  • A 2d-3d Image Registration Algorithm
  • A 2d-3d Image Registration Algorithm
  • A 2d-3d Image Registration Algorithm

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Embodiment Construction

[0039] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0040] The present invention is mainly applied in the CT perspective image registration of human vertebrae, figure 1 Be the flow chart of the present invention, as figure 1 As shown, the 2D-3D image registration algorithm of the present invention comprises steps:

[0041] (1) Scan the affected part of the patient (spine in this example) through the C-arm machine or CT machine to obtain a preoperative 3D image; automatically segment the preoperative 3D image to obtain a vertebral image, and then obtain the center point position of the vertebrae (ie The coordinates of the center point of the vertebra in the image coordinate system) and the bounding box (ie, the circumscribed cuboid of the vertebra);

[0042] (2) Use the C-arm machine or CT machine to perform anteroposterior and lateral perspective scans on the patient's affected area during t...

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Abstract

The invention discloses a 2D-3D image registration algorithm, which includes steps: (1) Scanning the affected part of the patient before operation to obtain a preoperative 3D image; (2) Construct the space model of the front and side perspective imaging equipment taken during the operation, and calculate the initial pose of the preoperative 3D image in the space model according to step (1); (3) Use step (2) ) to generate the front and side DRR images of the preoperative 3D images, and perform template matching with the corresponding intraoperative 2D perspective images to obtain the rough matching transformation pose of the preoperative 3D images; (4) use gradient descent The optimization algorithm performs precise optimization and matching to obtain the final transformed pose of the preoperative 3D image. The present invention performs rough matching by using template matching, and then uses a gradient descent optimization algorithm to obtain the optimal result, which can obtain very accurate registration results while ensuring registration speed.

Description

technical field [0001] The invention relates to the technical field of surgical navigation, in particular to a registration algorithm for 3D CT images and 2D perspective images. Background technique [0002] The 3D CT image and 2D perspective image registration algorithm calculates the pose transformation value between the 3D CT image and the 2D perspective image, which is used to integrate preoperative information (CT-based surgical planning data) into the image-guided placement surgery. In intraoperative X-ray projection images to improve the accuracy of reaching the target position. The current algorithm implementation usually uses 3D CT images to generate 2D DRR (Digital Reconstruction Radiology) images, calculates the similarity between DRR images and fluoroscopic images, and finds a certain pose of CT so that the generated DRR images and fluoroscopic images have the best similarity. Since the target variable has 6 degrees of freedom (3 of which represent rotation and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/33
CPCG06T2207/10081G06T2207/10116G06T2207/30004G06T7/33
Inventor 程敏汤翔
Owner NANJING TUODAO MEDICAL TECHNOLOGY CO LTD
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