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Simulation projection DRR generating method based on RayCasting improved algorithm

An improved algorithm and projection technology, applied in computing, 3D image processing, image data processing, etc., can solve the problems of reducing the real-time performance of 2D and 3D image registration and consuming a lot of time.

Inactive Publication Date: 2014-11-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Raycasting algorithm consumes a lot of time for traversing pixels and integrating pixels on the optical path during the DRR calculation process, which will greatly reduce the real-time performance of intraoperative 2D and 3D image registration

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  • Simulation projection DRR generating method based on RayCasting improved algorithm
  • Simulation projection DRR generating method based on RayCasting improved algorithm
  • Simulation projection DRR generating method based on RayCasting improved algorithm

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Embodiment Construction

[0045] A method for generating simulated projection images based on the improved RayCasting algorithm proposed by the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples.

[0046] First, the 3D image V is transferred from the DICOM server to the working PC. The size of the 3D image V is Width×Height×Depth, where Width is the length of the 3D image, Height is the height of the 3D image, and Depth is the width of the 3D image. The coordinates of a pixel in V are denoted by (x, y, z).

[0047] Such as figure 1 As shown, the projection model consists of two parts: a three-dimensional image and a projection structure, which are respectively defined in the XYZ rectangular coordinate system and the UVW rectangular coordinate system. The center of the three-dimensional image is located at the origin O of the rectangular coordinate system. The projected structure takes the coordinate system UVW as the reference coord...

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Abstract

The invention discloses a simulation projection DRR generating method based on a RayCasting improved algorithm, which belongs to the field of medical image processing. The method judge integration steps through the uniformity of local regions in a three-dimensional image, further quickens a RayCasting algorithm through multiscale image processing. The method has the advantages that a data structure used for preserving the content uniformity of the three-dimensional image is generated when data is preprocessed, the sampling point jump is realized according the content uniformity of the image during the practical calculating of an optical path, and the DRR generating speed is greatly increased.

Description

technical field [0001] The invention relates to the field of medical image registration, in particular to a projection model in two-dimensional and three-dimensional medical image registration and a method for generating a simulation projection (DRR). Background technique [0002] Computer-aided medical operation navigation system is a new interdisciplinary research field which integrates many disciplines such as medicine and computer technology. Its purpose is to use computer and tracking equipment to simulate various procedures involved in surgery, including surgical planning, surgical navigation, etc., to guide doctors to achieve high-precision surgical operations. With the wide application of surgical navigation system in clinic, 2D and 3D image registration has become a key technology in system development. In the process of 2D and 3D medical image registration, DRR is a commonly used intermediate model, and its generation speed and quality often have a crucial impact ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/06G06T15/60
Inventor 贾克斌魏嵬贾晓未
Owner BEIJING UNIV OF TECH