南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (1): 92.
徐海云1,梅 松1,袁 玲1*,沈中华1,朱庆萍2,倪晓武1,陆 健1
Xu Haiyun1,Mei Song1,Yuan Ling1*,Shen Zhonghua1,Zhu Qingping2,Ni Xiaowu1,Lu Jian1
摘要: 针对目前口腔医学在临床上对牙齿内部轮廓无法准确检测的问题,提出了利用激光超声纵波检测磨牙内部轮廓的方法.首先利用有限元方法模拟激光辐照牙齿产生超声波的过程,通过CT扫描与三维重建技术获取牙齿的三维模型,建立了超声纵波以及纵波在磨牙中传播的有限元模型.考虑激光在牙釉质中的渗透,修正了等效点声源的位置.选取磨牙上的一个截面,对其进行旋转扫描,并在激发点附近同侧接收得到多组超声信号.通过信号分析,求解纵波在牙釉质—牙本质界面反射点的位置,最终实现牙齿内部轮廓的检测.与牙齿的实际内部轮廓进行比较,结果精度比较高,验证了用激光超声纵波检测牙齿内部轮廓的可行性.最后分析了该方法的误差来源以及其适用条件.研究结果将对牙齿内部结构临床检测提供理论依据和检测方法,有助于激光超声技术在临床医学检测中的进一步发展和应用.
[1] 赵铱民.口腔修复学.第6版.北京:人民卫生出版社,2008,29-31.(Zhao Y M.Prosthodontics.The 6th Edition.Beijing:People’s Medical Publishing House,2008,29-31.) [2] 张玉森,李宁毅.激光扫描共聚焦显微镜在牙体病学中的应用现状.上海口腔医学,2007,16(2):219-224.(Zhang Y S,Li N Y.Current application of confocal laser scanning microscope(CLSM)in stomatology.Shanghai Journal of Stomatology,2007,16(2):219-224.) [3] 王守涛,陈庆光,林 斌等.光学技术在早期龋齿检测中的应用.激光生物学报,2009,18(6):846-852.(Wang S T,Chen Q G,Lin B,et al.Detection of early dental caries based on optical methods.ACTA Laser Blology Sinica,2009,18(6):846-852.) [4] 姚 晖,孟 卓,李燕妮等.自研全光纤光学相干计算机断层摄影术灵敏检测早期牙釉质龋.生物医学工程与临床,2009,13(4):292-296.(Yao H,Meng Z,Li Y N,et al.Detection of early enamel caries with a new selfdeveloped allfiberOCT system.BME & Clinical Medicine,2009,13(4):292-296.) [5] 叶鹏飞.基于A超三维重建系统的人牙釉质成像方法研究.硕士学位论文.广州:华南理工大学,2014.(Ye P F.Research of human enamel imaging method based on threedimensional Amode ultrasound reconstruction system.Master Dissertation.Guangzhou:South China University of technology,2014.) [6] 欧 攀,王 婷,李瑞祥.一种基于结构光的牙齿三维测量系统.激光与光电子学进展,2016(1):115-119).(Ou P,Wang T,Li R X.A threedimensional teeth measurement system based on structured light.Laser & Optoelectronics Progress,2016(1):115-119.) [7] 张东波,赵金峰,潘永东.空耦超声激发板波的COMSOL模拟.南京大学学报(自然科学),2015(S1):129-133.(Zhang D B,Zhao J F,Pan Y D.COMSOL simulation of plate wave generated by aircoupled ultrasonic transducers.Jouranl of Nanjing University(Natural Science),2015(S1):129-133.) [8] Barber F E,Lees S,Lobene R R.Urasonic pulseecho measurements in teeth.Archives of Oral Biology,1969,14(7):745-60. [9] Culjat M,Singh R S,Yoon D C,et al.Imaging of human tooth enamel using ultrasound.IEEE Transactions on Medical Imaging,2003,22(4):526-9. [10] Bartosz S.Enamel thickness measurement with a high frequency ultrasonic transducerbased handheld probe for potential application in the dental veneer placing procedure.ACTA Bloeng Biomech,2011,13(1):65-70. [11] Blodgett D W.Applications of laserbased ultrasonics to the characterization of the internal structure of teeth.Journal of the Acoustical Society of America,2003,114(1):542-9. [12] Wang H C,Fleming S,Law S,et al.Selection of appropriate laser parameters for launching surface acoustic waves on tooth enamel for non-destructive hardness measurement.In:Proceedings of IEEE Australian Conference of Optical Fibre Technology/Australian Optical Society (ACOFT/AOS).Melbourne:IEEE Press,2006,99-101. [13] Wang H C.Simple alloptical noncontact narrowband surface acoustic wave measurement system for evaluating the rayleigh velocity of small samples or areas.Optical Fibre Technology,2009,48(8):1444-1451. [14] Wang H C,Fleming S,Lee Y C,et al.Laser ultrasonic surface wave dispersion technique for nondestructive evaluation of human dental enamel.Optics Express,2009,17(18):15592-15607. [15] 陈庆光.牙齿组织光散射机理及龋齿早期检测研究.博士学位论文.浙江大学,2011.(Chen Q G.Study of light diffusion and early detection of dental caries.Ph.D.Dissertation.Hangzhou:Zhejiang University,2011.) [16] 刘 茜.人类牙齿的外貌结构对激光超声波传播影响的研究.硕士学位论文.南京:南京理工大学,2012.(Liu X.Study of the influence of laser ultrasonic transmission caused by the appearance of human teeth.Master Dissertation.Nanjing:Nanjing University of Science and Technology,2012.) [17] 涂世军.基于激光光声效应的超声表面波无损检测的研究.硕士学位论文.上海:上海交通大学,2012.(Tu S J.Laser photo acoustic effect for nondestructive evaluation using surface acoustic wave.Master Dissertation.Shanghai:Shanghai Jiao Tong University,2012.) [18] 孙凯华.激光声表面波用于早期龋齿和牙隐裂的诊断与评估.博士学位论文.南京:南京理工大学,2014.(Sun K H.Diagnosis and evaluation of early dental caries and cracked tooth by using laser surface acoustic waves.Ph.D.Dissertation.Nanjing:Nanjing University of Science and Technology,2014.) |
No related articles found! |
|