Browse > Article
http://dx.doi.org/10.7471/ikeee.2014.18.2.240

A Frequency Domain Analysis of Corneal Deformation by Air Puff  

Hwang, Ho-Sik (Dept. of Ophthalmology, Chuncheon Sacred Heart Hospital, Hallym University)
Lee, Byeong Ha (School of Information & Communications, GIST)
Lee, Chang Su (Dept. of Electronic Engineering, The University of Suwon)
Publication Information
Journal of IKEEE / v.18, no.2, 2014 , pp. 240-247 More about this Journal
Abstract
Intraocular pressure is measured after a cornea air puff by observing biomechanical properties such as thickness or displacement of the cornea. In this paper, we deal with a frequency domain analysis of corneal deformation in the air puff tonometry that is used to diagnose glaucoma or lasik. We distinguish the patient from the normal by measuring the oscillation frequency in the neighborhood of the central cornea section. A binary image was obtained from the video images, and cornea vertical oscillation profile was extracted from the difference between the vertical displacement data and the curve fitting. In terms of Fourier transform, a vibration frequency of 479.2Hz for the patient was obtained as well as more higher 702.8Hz for the normal due to stiffness. Hilbert-Huang transform's empirical mode decomposition generally describes local, nonlinear, and nonstationary data. After the data were decomposed into intrinsic mode functions, a spectrum and power were analysed. Finally, we confirm that the patient has 6 times more higher power ratio for the specific intrinsic mode function between the patient and the normal.
Keywords
Cornea air puff; intraocular pressure; spectral analysis; Hilbert-Huang transform; empirical mode decomposition;
Citations & Related Records
연도 인용수 순위
  • Reference
1 W. F. Walker, B. H. Friemel, L. N. Bohs, and G. E. Trahey, "Real-time imaging of tissue vibration using a two-dimensional speckle tracking system," IEEE Proc. on Ultrasonics Symposium, pp. 873-877, 1993.
2 M. R. Bhatt and S. V. Rao, "On Imaging based Non-contact Tonometer for Intraocular Pressure Measurement," 2013 IEEE Point-of-Care Healthcare Technologies (PHT) Bangalore, India, pp. 97-100, Jan. 16-18, 2013.
3 J. Nishiyama, I. Kao, and M. Kaneko, "IOP Measurement using Air-Puff Tonometry: Dynamic Modeling of Human Eyeball with Experimental Results," Internat. Conf. on Ubiquitous Robots and Ambient Intelligence (URAI), Jeju, pp. 134-139, Oct. 31-Nov. 2 2013.
4 Y. Yamakoshi, J. Sato, and T. Sato, "Ultrasonic imaging of internal vibration of soft tissue under forced vibration," IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 37, no. 2, pp. 45-53, 1990.   DOI   ScienceOn
5 Z. Xie, E.-H. Kim, and Y. Kim, "Tissue vibration pulsatility for arterial bleeding detection using Doppler ultrasound," IEEE Inter. Conf. on Engineering in Medicine and Biology Society, pp. 2272-2275, 2009.
6 A. A. Nikooyan, and A. A. Zadpoor, "Effects of Muscle Fatigue on the Ground Reaction Force and Soft-Tissue Vibrations During Running: A Model Study," Biomedical Engineering, IEEE Transactions on vol. 59, no. 3, pp. 797-904, 2012.   DOI   ScienceOn
7 N. E. Huang, and S. S. P. Shen, Hilbert-Huang Transform and its Applications, World Scientific, London, ISBN 978-9812563767, 2005.
8 R. Ambrosio, "All you have ever wanted to see and measure about Corneal Biomechanics," www.youtube.com/watch?v=lxuOT_23HCA, Apr. 3, 2011.
9 A. Kotecha, "What biomechanical properties of the cornea are relevant for the clinician?" Surv. Ophthalmol. vol. 52, no. 2: pp. 109-114, Nov. 2007.   DOI   ScienceOn
10 S. Kling and S. Marcos, "Contributing factors to corneal deformation in air puff measurements," Ophthalmol. Vis. Sci. vol. 26, no. 54(7) pp. 5078-5085, Jul. 2013.   DOI   ScienceOn
11 C. Dorronsoro, D. Pascual, P. Perez-Merino, S. Kling, and S. Marcos, "Dynamic OCT measurement of corneal deformation by an air puff in normal and cross-linked corneas," Biomed. Opt. Express. vol. 1, no. 3(3), pp. 473-487 Mar. 2012.   DOI
12 Y. Kurita, Y. Iida, R. Kempf, and M. Kaneko, "Dynamic Sensing of Human Eye using a High Speed Camera," Proc. of the 2005 IEEE Internat. Conf. on Information Acquisition pp. 338-343, Jun. 27 - Jul. 3 2005.
13 K. H. Kim, W. Jang, B. H. Kim, and Y. H. Seo, "Intraocular Pressure Measurement Devices using Micro Reflected Air Pressure Sensor for the Pre-diagnosis of the Glaucoma," Proc. of 10th IEEE Internat. Conf. on Nanotechnology Joint Symposium with Nano Korea KINTEX, Aug. 17-20 2010.