A Context-preserving Environment Volume Rendering Method Based on Isosurface
An isosurface and volume rendering technology, applied in the field of image processing, can solve problems such as loss of structural information and blurred target areas, and achieve the effects of simple parameter adjustment, simplified interaction methods, and improved efficiency
Active Publication Date: 2011-12-14
冯前进
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[0005] The purpose of the present invention is to provide a volume rendering method based on isosurfaces in medical images to preserve the context environment, which can preserve the structural information related to the region of interest while clearly displaying the region of interest, so as to overcome the complexity caused by sectioning. Loss of interaction and structural information and blurring of target regions in existing methods
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[0021] The following is the specific process of imaging the CT data of a set of heads by adopting the isosurface-based method of preserving the context environment volume rendering of the present invention:
[0022] The data source used in the experiment is the OsiriX website; the GPU is a Quadro FX 1700 graphics card.
[0023] Step 1, read in the CT image, the size of the image is 512×512×330, and use the 3D anisotropic filter to preprocess the input volume data. The preprocessing is performed on the GPU to reduce the noise and the isosurface extraction and gradient The influence of the calculation, after which the volume data is stored as a 3D texture for gray value indexing of the 3D volume data.
[0024] Step 2, such as figure 1 As shown, the spatial position of the ray entering the 3D volume data 1 and passing through the 3D volume data is obtained from the front surface and the back surface of the color cube. In the forward direction, samples are taken along the light ...
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The present invention provides a method for rendering a context-preserving environment volume based on an isosurface, comprising the following steps: (a) storing three-dimensional volume data as three-dimensional texture data for the gray value index of the three-dimensional volume data; The three-dimensional volume data on each ray of the volume data is sampled, and the isosurface coordinate data is extracted according to the gray value of the sampling point, and the isosurface coordinate data on the ray is extracted; (c) if the isosurface coordinate data If the extraction is successful, continue to sample the subsequent three-dimensional volume data along the light direction, and use the isosurface coordinate data and the current sampling point data to perform image synthesis; otherwise, go back to step (b) and continue to process the three-dimensional volume data. sampling. This method can achieve the purpose of clearly displaying a specific region of interest while retaining the structural information of the surrounding tissue, achieving a similar sectioning effect.
Description
technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an isosurface-based volume rendering method for preserving context. Background technique [0002] Medical imaging equipment generates a large amount of medical data every day. Usually these data are two-dimensional images. It is very difficult for physicians to construct the three-dimensional spatial relationship between the lesion and surrounding tissues based on their own experience from multiple two-dimensional images. The volume rendering (Volume Rendering) visualization method directly reconstructs two-dimensional sequence images into three-dimensional shapes, and doctors can directly observe and analyze lesions from the real three-dimensional space, so volume rendering technology has been widely used in the medical field. [0003] Volume rendering methods often need to process a large amount of data, and personal computers use CPU calculations, which ca...
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IPC IPC(8): G06T19/00
Inventor 冯前进贠照强陈武凡
Owner 冯前进