本文選題：乳腺超聲 + 三維成像　； 參考：《中國科學院大學(中國科學院工程管理與信息技術(shù)學院)》2017年碩士論文

【摘要】：乳腺三維成像作為判斷乳腺腫瘤最直觀簡便的方法,已經(jīng)成為世界上各大超聲廠商和醫(yī)療機構(gòu)的研究熱點。與傳統(tǒng)二維乳腺超聲相比,乳腺三維成像可立體展示整個乳房的結(jié)構(gòu),360度無死角的查看乳房的任意切面,大大增強發(fā)現(xiàn)乳腺腫瘤的幾率。本文的工作主要包括:(1)研究了乳腺三維成像的產(chǎn)生背景與意義,介紹了近年來國內(nèi)外廠商和醫(yī)療機構(gòu)的研究現(xiàn)狀,分析了五種基本的光照模型和典型的馮氏光照模型,再重點研究近年來提出的三維陰影方面的先進算法局部環(huán)境光遮蔽算法,并對這些模型進行了驗證和分析;(2)為了生成高質(zhì)量的乳腺三維圖像,在散射和陰影模型基礎(chǔ)上,提出一種全新的光照模型。本文提出的算法包含散射、陰影和高光反射,對光照的顏色和陰影分離計算,允許指定不同顏色通道的相位函數(shù)方程,可自定義入射光的內(nèi)散射圓錐體角度和視點方向上的外散射光圓錐體角度,該模型對最終成像的陰影效果和三維顏色有很大的提升效果,對醫(yī)學圖像的醫(yī)學特征等能很好的自定義,輔助分析人員對圖像做出正確的判斷。本文在研究現(xiàn)有三維光照模型基礎(chǔ)上,模擬現(xiàn)實生活中的光照原理,提出一種新的光照模型,研究結(jié)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,一般的中高端顯卡都能夠保持相對較高的幀速率。本文的研究對其它領(lǐng)域的三維成像的研究和應(yīng)用也有一定積極促進作用。
[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.
【學位授予單位】：中國科學院大學(中國科學院工程管理與信息技術(shù)學院)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：R737.9;TP391.41

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