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Simulated projection DRR( digitally reconstructed radiograph) generating method based on CUDA (compute unified device architecture) technology

A technology of projection and technology, which is applied in the field of projection model and simulation projection generation, and can solve problems such as low precision and poor registration robustness

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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Problems solved by technology

[0007] In order to overcome the shortcomings of poor registration robustness and low accuracy due to the projection model

Method used

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  • Simulated projection DRR( digitally reconstructed radiograph) generating method based on CUDA (compute unified device architecture) technology
  • Simulated projection DRR( digitally reconstructed radiograph) generating method based on CUDA (compute unified device architecture) technology
  • Simulated projection DRR( digitally reconstructed radiograph) generating method based on CUDA (compute unified device architecture) technology

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Embodiment Construction

[0040]A CUDA platform-based simulation projection image generation method proposed by the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples.

[0041] 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 coordinate system. Let the origin of UVW be the ISO center. The X light source is located on the positive semi-axis of the W axis. The distance from the X-ray source to the ISO center is D1. The projection plane is perpendicular to the W axis. The intersection of the projection plane and the W-axis is located on the negative semi-axis of the W-...

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Abstract

The invention discloses a simulated projection DRR ( digitally reconstructed radiograph) generating method based on a CUDA (compute unified device architecture) technology. The method comprises the following steps: establishing a new projection model; back-projecting each pixel point of a two-dimensional image; and finally generating a simulated projection image required by image registration through computing the sum of grey values of three-dimensional images on a back-projection line. Besides, based on the model, the invention also discloses a hardware acceleration method based on the CUDA technology. By using the method disclosed by the invention, the coupling between the projection distortion and scale variation can be effectively eliminated, the robustness and the accuracy of two-dimensional and three-dimensional image registration are increased, and the real-time and the efficiency of the algorithm are improved.

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 surgery is a new interdisciplinary research field that integrates many disciplines such as medicine and computer technology. Its purpose is to use computer and tracking equipment to simulate various processes involved in surgery, including surgical planning, surgical navigation, etc., to guide doctors to achieve high-precision surgical operations. [0003] Medical image registration is a key technology in computer-assisted surgery. Especially in bone trauma navigation surgery, preoperative 2D surgical planning data can be matched with intraoperative 3D images through 2D and 3D image registration, and then the reconstruction of surgical planning data in 3D images can be compl...

Claims

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Application Information

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IPC IPC(8): G06T15/50
Inventor 贾克斌魏嵬贾晓未
Owner BEIJING UNIV OF TECH
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