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Stratified spin-off body drawing method oriented to medical data and system thereof

A medical data and volume rendering technology, applied in image data processing, 3D image processing, instruments, etc., to achieve the effect of eliminating the tedious and rapid stripping of repeated modification of transfer function

Inactive Publication Date: 2011-02-02
ZHEJIANG UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of occlusion between different tissues in the existing medical data, the calculation is complicated, the accuracy is low, and the requirements of clinical application cannot be met. , medical data-oriented layered peeling volume rendering method and system that can meet the requirements of clinical applications

Method used

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  • Stratified spin-off body drawing method oriented to medical data and system thereof
  • Stratified spin-off body drawing method oriented to medical data and system thereof
  • Stratified spin-off body drawing method oriented to medical data and system thereof

Examples

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Embodiment 1

[0030] refer to figure 1 ~Fig. 7, a kind of layered stripping volume rendering method for medical data, described layered stripping method comprises the following steps:

[0031] 1) Import medical body data;

[0032] 2) Use the ray casting algorithm to sample the volume data along the light direction, calculate the slope between the adjacent minimum and maximum opacity values, and determine the layering according to the user-specified slope threshold and cumulative opacity threshold points, including:

[0033] (2.1), find the sampling point A with the minimum value of opacity along the light, and record the position Pa and the opacity value Aa of the sampling point A;

[0034] (2.2), find the first sampling point B with the maximum value of opacity after point A along the light, and record the position Pb and opacity value Ab of point B;

[0035] (2.3), according to formula l AB =(Ab-Aa) / (Pb-Pa) Calculate the slope l between sampling points A and B AB ;

[0036] (2.4), s...

Embodiment 2

[0049] refer to figure 1 ~Fig. 7, a layered peeling volume rendering system for medical data, including: a data import module, used to import medical volume data; a layered point determination module, used to use the ray-casting algorithm to find Sampling point A with a small value, and record the position Pa of sampling point A and the opacity value Aa; find the first sampling point B with the maximum value of opacity after point A along the ray, and record the position Pb of point B and Opacity value Ab; according to the formula l AB =(Ab-Aa) / (Pb-Pa) Calculate the slope l between sampling points A and B AB ;Specify a slope threshold L by the user; compare l AB with L: only if l AB When >L, take the sampling point A as a layering point, otherwise continue to search for sampling points that can meet the layering requirements; the volume rendering module is used to start from the layering points of different tissues on each ray, and use ray casting The algorithm performs di...

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Abstract

A delamination volume drawing method oriented to medical data includes the following steps: 1) medical volume data is inputted; 2) ray casting algorithm is used, volume data is sampled along the direction of light ray, and a layering point is determined according to slope threshold value appointed by a user and accumulated opacity threshold value by counting the slope between adjacent opacity minimum value and maximum value; 3) beginning with the layering points of different tissues of each light ray, the ray casting algorithm is used to carry out direct volume drawing. A delamination volume drawing system oriented to medical data is also provided. The invention efficiently solves the shielding problem among different tissues, has simple calculation and high precision, and can meet the requirements for clinical application.

Description

technical field [0001] The invention relates to a medical data-oriented layered peeling volume rendering method and system thereof. Background technique [0002] After more than ten years of development, medical visualization has developed from an auxiliary diagnosis to an important means of auxiliary treatment, and will penetrate into various medical fields. After the 1970s, the two-dimensional digital tomographic image sequences obtained by medical imaging technologies such as computerized tomography (CT), nuclear magnetic resonance (MRI) and ultrasound already contain three-dimensional information of various organs in the human body, but only rely on This kind of two-dimensional digital tomographic image is difficult to visually reflect or determine the three-dimensional structure of objects and the relationship between them. The visualization of medical volume data is to use computer graphics and image processing technology to generate medical volume data into three-dim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/00G06T15/08
Inventor 梁荣华李诚谭国珍包佳蕊吴福理黄鲜萍蒋莉毛剑飞
Owner ZHEJIANG UNIV OF TECH
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