乳腺三维成像光照模型的研究及实现

发布时间：2018-04-26 05:31

本文选题：乳腺超声 + 三维成像　；参考：《中国科学院大学(中国科学院工程管理与信息技术学院)》2017年硕士论文

【摘要】：乳腺三维成像作为判断乳腺肿瘤最直观简便的方法,已经成为世界上各大超声厂商和医疗机构的研究热点。与传统二维乳腺超声相比,乳腺三维成像可立体展示整个乳房的结构,360度无死角的查看乳房的任意切面,大大增强发现乳腺肿瘤的几率。本文的工作主要包括:(1)研究了乳腺三维成像的产生背景与意义,介绍了近年来国内外厂商和医疗机构的研究现状,分析了五种基本的光照模型和典型的冯氏光照模型,再重点研究近年来提出的三维阴影方面的先进算法局部环境光遮蔽算法,并对这些模型进行了验证和分析;(2)为了生成高质量的乳腺三维图像,在散射和阴影模型基础上,提出一种全新的光照模型。本文提出的算法包含散射、阴影和高光反射,对光照的颜色和阴影分离计算,允许指定不同颜色通道的相位函数方程,可自定义入射光的内散射圆锥体角度和视点方向上的外散射光圆锥体角度,该模型对最终成像的阴影效果和三维颜色有很大的提升效果,对医学图像的医学特征等能很好的自定义,辅助分析人员对图像做出正确的判断。本文在研究现有三维光照模型基础上,模拟现实生活中的光照原理,提出一种新的光照模型,研究结果表明本文提出的光照模型在成像效果上有很大的提升,性能上,一般的中高端显卡都能够保持相对较高的帧速率。本文的研究对其它领域的三维成像的研究和应用也有一定积极促进作用。
[Abstract]:As the most intuitive and simple method to judge breast tumors, 3D mammography has become a hot research topic of ultrasound manufacturers and medical institutions in the world. Compared with traditional two-dimensional breast ultrasound, three-dimensional mammography can show the structure of the whole breast in 360 degrees without dead angle to view any section of the breast, greatly enhancing the probability of finding breast tumors. The work of this paper mainly includes: (1) studying the background and significance of 3D mammography, introducing the research status of domestic and foreign manufacturers and medical institutions in recent years, analyzing five basic illumination models and the typical Feng's illumination model. In order to generate high quality mammary gland 3D images, the author focuses on the local ambient light shading algorithms, which are advanced in recent years, and verifies and analyzes these models. In order to generate high quality mammary gland images, based on the scattering and shadow models, A new illumination model is proposed. The algorithm proposed in this paper includes scattering, shadow and specular reflection. The color and shadow of illumination are calculated separately, and the phase function equations of different color channels are allowed to be specified. The angle of inner scattering cone of incident light and the angle of outer scattering cone in view direction can be customized. The model can greatly improve the shadow effect and 3D color of the final imaging. Medical features of medical images can be well defined, assist analysts to make a correct judgment of images. On the basis of studying the existing 3D illumination model, this paper simulates the principle of illumination in real life, and proposes a new illumination model. The results show that the illumination model proposed in this paper has a great improvement in imaging effect and performance. General high-end graphics cards are able to maintain a relatively high frame rate. The research in this paper can also promote the research and application of three-dimensional imaging in other fields.
【学位授予单位】：中国科学院大学(中国科学院工程管理与信息技术学院)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R737.9;TP391.41

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