基于计算全息技术的彩色CT真三维可视化
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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 algorithm 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 modulators(LC-SLM)connected to a computer.Re-illuminating the three CGHs with red,green and blue laser 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 stereoscopic effects of the 3D color CT image.The principle and experimental result are given.
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 algorithm 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 modulators(LC-SLM)connected to a computer.Re-illuminating the three CGHs with red,green and blue laser 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 stereoscopic effects of the 3D color CT image.The principle and experimental result are given.
引文
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[2]HE Peng,WEI Biao,FENG Peng,et al.Color CT image reconstruction based on MARS system[J].High Power Laser and Particle Beams,2015,27(5):054004.何鹏,魏彪,冯鹏,等.基于MARS系统的彩色CT图像重建[J].强激光与粒子束,2015,27(5):054004.
[3]WANG Yi-cheng,LIU Feng,ZHANG Ling.Improvement in printing technique of spiral CT three-dimensional colour image[J].Chinese Journal of Radiology,2005,39(3):323-324.汪义成,刘峰,张凌.螺旋CT彩色三维图像打印技术探讨[J].中华放射学杂志,2005,39(3):323-324.
[4]Jie Wu,Ashwin Belle,Rosalyn H Hargraves.Bone segmentation and 3D visualization of CT images for traumatic pelvic injuries[J].International Journal of Imaging Systems and Technology,2014,24(1):29-38.
[5]Jan Rosella,Paolo Cabrasa.A three-stage method for the3D reconstruction of the tracheobronchial tree from CT scans[J].Computerized Medical Imaging and Graphics,2013,37(7):430-437.
[6]ZHANG Xiang-chun.Limited angle computed tomography reconstruction algorithm based on line scanning[J].Nondestructive Testing,2013,35(2):35-37.张祥春.基于线阵扫描的有限角度投影数据的CT三维重建[J].无损检测,2013,35(2):35-37.
[7]Kim Y,Shim H,Kim K,et al.Common-path diffraction optical tomography for investigation of three-dimensional structures and dynamics of biological cells[J].Optics Express,2014,22(5):10398-10407.
[8]ZHAI Hong-chen,WANG Ming-wei,PAN Dong,et al.Vertical area partition of recording in the multiple-exposure rainbow hologram for 3-D achromatic synthesis of tomographic patterns[J].Chinese Journal of Lasers,2000,27(9):828-832.翟宏琛,王明伟,潘栋,等.应用纵向分区彩虹全息术合成断层图像的三维消色像[J].中国激光,2000,27(9):828-832.
[9]Shimobaba T,Ito T.Random phase-free computer-generated hologram[J].Optics Express,2015,23(7):9549-9554.
[10]WANG Hui,LI Yong,JIN Hong-zhen,et al.Three-dimensional visualization of shape measurement data based on a computer generated hologram[J].J.Opt.A:Pure.Appl.,2003,5:95-199.
[11]LI Yong,WANG Hui,YING Chao-fu.Research of the computer-generated rainbow hologram with large viewing angle[J].Acta Photonica Sinica,2003,32(5):595-597.李勇,王辉,应朝福.大视角计算机制彩虹全息图的研究[J].光子学报,2003,32(5):595-597.
[12]SU Xian-yu,LI Ji-tao.Information optics[M].Beijing:Science Press,1999,111-116.苏显渝,李继陶.信息光学[M].北京:科学出版社,1999,111-116.
[13]XU Huo-xi,JIANG Ke,FANG Hao.Color image stereo matching algorithm using neighborhood weights and color information[J].Journal of Optoelectronics·Laser,2015,26(10):2031-2036.徐火希,姜柯,方浩.结合邻域权值和色彩信息的彩色立体匹配算法[J].光电子·激光,2015,26(10):2031-2036.
[14]YANG Shang-gong,GAN Liang-qin,XIONG Fei-bing.Fullcolor three-dimensional display based on computer-generated synthetic holography[J].Laser Technology,2013,37(3):342-346.杨上供,甘亮勤,熊飞兵.计算合成全息与全彩色3维显示技术的研究[J].激光技术,2013,37(3):342-346.
[15]YANG Shang-gong,DU Xu-ri,CHEN Hai-yun,et al.Color rainbow holography combining computer-generated hologram and optical holo-gram[J].Journal of Optoelectronics·Laser,2009,20(1):74-77.杨上供,杜旭日,陈海云,等.计算机与光学方法相结合的彩色彩虹全息术[J].光电子·激光,2009,20(1):74-77.
[16]Zeng C,Gao H Y,Liu J C,et al.Latest developments of dynamic holographic three-dimensional display[J].Acta.Phys.Sin.,2015,64(2):124215.
[17]PEI Chuang,JIANG Xiao-yu,DING Sheng,et al.Three-dimensional display of computer-generated hologram based on spatial light modulator[J].Journal of Applied Optics,2013,34(5):772-777.裴闯,蒋晓瑜,丁晟,等.利用空间光调制器实现计算全息三维显示[J].应用光学,2013,34(5):772-777.
[18]Moustafa Sayem El-Daher.Applying gray-scaled detour phase hologram on liquid crystal on silicon spatial light modulator(LCoS-SLM)[J].Journal of Modern Optics,2016,63(6):586-589.
[19]LIU Ya-fei,SHI Xia,ZHU Wu-feng,et al.Study on incoherent on-axis digital holographic microscopy[J].Journal of Optoelectronics·Laser,2016,27(12):1347-1351.刘亚飞,石侠,朱五凤,等.非相干同轴数字全息显微镜成像研究[J].光电子·激光,2016,27(12):1347-1351.
[20]WANG Hui.Three dimensional display of wavefront reconstruction[M].Beijing:Science Press,2016,144-146.王辉.波前再现三维显示[M].北京:科学出版社,2016,144-146.
[21]HAN Jing-fu.Optical parts in the MD projector(Ⅲ)——dichroic mirror and dichroic prism[J].Advaanced Display,2010,109:5-12.韩景福.MD投影机中的光学元器件(三).二向色分光镜与二向色合色棱镜[J].现代显示,2010,109:5-12.
[22]LI Bao-hua,YANG Kun-tao,ZENG You-yi,et al.Colorcombination prism in liquid-crystal display[J].Optical Technique,2004,30(1):107-112.李宝华,杨坤涛,曾有义,等.液晶显示中的合色棱镜[J].光学技术,2004,30(1):107-112.
[23]YU Ying-jie,DAI Lin-mao,ZHENG Hua-dong,et al.Experimental study on carrying three-dimensional image with cylinder mist screen in electro-holographic reconstruction[J].Laser&Optoelectronics Progress,2010,47(10):1-6.于瀛洁,代林茂,郑华东,等.圆柱雾屏承载相息图光电再现三维影像的实验研究[J].激光与光电子学进展,2010,47(10):1-6.