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Spherical coordinate index method for medical three-dimensional visualization

A technology of spherical coordinates and spherical coordinate system, which is applied in the field of medical 3D visualization, can solve the problems of slow data processing speed, achieve the effects of saving time, improving visualization speed, and meeting clinical requirements

Inactive Publication Date: 2017-05-10
江西中科九峰智慧医疗科技有限公司
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the data processing speed in the existing medical 3D visualization scheme is slow and cannot meet the clinical requirements, a new ray projection acceleration scheme is needed to make the medical 3D visualization speed meet the clinical requirements

Method used

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  • Spherical coordinate index method for medical three-dimensional visualization
  • Spherical coordinate index method for medical three-dimensional visualization
  • Spherical coordinate index method for medical three-dimensional visualization

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example 1

[0029] Example 1, establishment of vector spherical coordinate index

[0030] In the process of 3D visualization based on the principle of ray tracing, the calculation of voxel normal vectors and related items will be involved in the process of image sampling and synthesis. Correspondingly, in the Cartesian coordinate system, the normal vector N of the voxel is given by the following formula:

[0031]

[0032] in

[0033]

[0034] Among them, N(x i ,y j ,z k ) is the normal vector, f(x i ,y j ,z k ) for the point (x i ,y j ,z k ) CT value.

[0035] Since the voxel normal vector is unitized, it can be used in the spherical coordinate system figure 1 The θ and φ angles in are uniquely determined (such as figure 1 shown).

[0036] The θ and φ angles here are figure 1 The azimuth angle in , θ is the angle between the directed line segment and the positive direction of the z-axis; φ is the angle turned counterclockwise from the x-axis when viewed from the positi...

example 2

[0044] Example 2, specific application of vector spherical coordinate index in volume display

[0045] The formula for volume display image synthesis based on ray tracing is given by:

[0046] c out,λ (u,v)=c in,λ (u,v)(1-α(x i ,y j ,z k ))+c λ (x i ,y j ,z k )α(x i ,y j ,z k ) (2.1);

[0047] Among them, c out,λ (u, v) represents the color value when the light leaves the voxel, c in,λ (u, v) represents the color value before the light enters the voxel, α(x i ,y j ,z k ) represents the opacity of the current voxel, c λ (x i ,y j ,z k ) represents the color value of the current voxel.

[0048] The above formula 2.1 only gives the synthetic formula of color and opacity based on the light absorption and emission model. In practical applications, in order to obtain better visualization effects, it is necessary to introduce the corresponding illumination model. In this example, the Phong model is selected. To illustrate the application of vector spherical coor...

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Abstract

The invention discloses a spherical coordinate index method for medical three-dimensional visualization, and the method comprises the steps: calculating a normal vector of a volume element in advance, and carrying out the storage based on a spherical coordinate index method, so as to update a data list corresponding to a normal vector index. According to the scheme of the invention, the method can effectively avoid the repeated calculation of the normal vector of the volume element and the related parameters of the normal vector, and saves a large amount of time. Meanwhile, the method can greatly reduce the expenditure of memory. The method can further improve the visualization speed, so as to enable medical three-dimensional visualization to meet the clinic requirements.

Description

technical field [0001] The invention relates to medical image processing technology, in particular to medical three-dimensional visualization technology. Background technique [0002] The ray-casting method can generate high-quality three-dimensional images, which can meet the needs of clinical diagnosis. But one of its outstanding shortcomings is the slow drawing speed. At present, there are mainly the following software acceleration technologies for ray casting: bounding box technology (bounding box), space subdivision (space subdivision) technology and ray coherence (ray coherence) technology. [0003] Among them, the basic principle of the bounding box technology is to generate a minimum polyhedron circumscribing the object on the periphery of the object. When the ray casting method is used for drawing, the data other than the polyhedron is directly skipped and only the sampling and image synthesis are performed within this polyhedron. [0004] The space subdivision te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00G06T15/50G06T1/60
CPCG06T17/00G06T1/60G06T15/506G06T2210/41
Inventor 王玉
Owner 江西中科九峰智慧医疗科技有限公司
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