基于计算全息技术的彩色CT真三维可视化  

Three-dimensional visualization of color CT images based on computer generated Holography

作　　者：杨上供[1] 高志强[2] 甘亮勤[1] 曾胜财[3] 程再军[1] 

机构地区：[1]厦门理工学院福建省光电技术与器件重点实验室,福建厦门361024 [2]浙江师范大学信息光学研究所,浙江金华321004 [3]厦门海洋职业技术学院信息系,福建厦门361100

出　　处：《光电子．激光》2018年第2期212-217,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金青年科学基金(61504113);福建省自然科学基金(2014J01255);福建省教育厅中青年教师教育科研(JAT160370;JA15378;JA15750)资助项目

摘　　要：不同于现有的用计算机软件合成的CT图像的伪三维可视化,本文提出了一种基于计算全息技术的彩色CT图像的真三维可视化技术。首先,利用计算全息技术对彩色CT图像进行三维重建,将一组彩色CT图像的空间二维信息融合成三维信息,并以计算全息图(CGH)的形式进行保存;然后,设计了彩色CT图像光电再现与三维显示系统,以液晶空间光调制器(LC-SLM)作为CGH的显示载体,通过计算机同时输入3幅CGH,通过光电再现获得三原色三维再现像,利用合色棱镜将三原色再现像合成为彩色图像,用雾屏作为彩色三维再现像的显示载体,获得彩色真三维CT图像。在全息图的计算过程中,基于CT图像的二维属性,采用了快速傅里叶变换(FFT)算法,大大加快了计算速度。给出了理论分析与实验结果。Different from the pseudo three-dimensional （3D） visualization of computer tomography （CT） images synthesized by computer softwares, a new technology of 3D visualization of color CT images based on computer generated holography is proposed. A set of color CT images are decomposed into three primary color CT images of red,green and blue, then, the two-dimension information of this set of color CT images is synthesized into 3D information using three computer generated holograms （CGHs） which are saved in a computer. Because all CT images are two-dimension, fast-Fourier-transform algo- rithm that can greatly speed up the calculation of CGHs is adopted. 3D photoelectric display system of color CT images is set up,in which,three CGHs are displayed on three liquid crystal spatial light modu- lators （LC-SLM） eonnected to a computer. Re-illuminating the three CGHs with red,green and blue la- ser simultaneously, three 3D monochrome CT images of three primary colors are obtained, and a 3D color CT image is gotten by fusing the three 3D monochrome CT images together with X-Cube. A fog screen is used in this system as the 3D display screen for the final 3D color CT image,that not only increases the visual angle, but also enhances the stereoscopie effects of the 3D color CT image. The principle and experimental result are given.

关 键 词：计算全息 CT 三维 彩色 再现 计算 

分 类 号：TN27[电子电信—物理电子学]