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Curvature measurement of human bilateral cochleae

Published online by Cambridge University Press:  21 September 2015

J-F Yu*
Affiliation:
Graduate Institute of Medical Mechatronics, Chang Gung University, Taoyuan, Taiwan Taiouan Interdisciplinary Otolaryngology Laboratory, Chang Gung University, Taoyuan, Taiwan
K-C Lee
Affiliation:
Taiouan Interdisciplinary Otolaryngology Laboratory, Chang Gung University, Taoyuan, Taiwan Department of Electrical Engineering, Chang Gung University, Taoyuan, Taiwan
Y-L Wan
Affiliation:
Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital at Linkou, Institute for Radiological Research, College of Medicine, Chang Gung University, Taoyuan, Taiwan
Y-C Peng
Affiliation:
Department of Prosthodontics, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
*
Address for correspondence: Dr Jen-Fang Yu, Graduate Institute of Medical Mechatronics, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan 333, Taoyuan, Taiwan Fax: +886 3 2118050 E-mail: jfyu.phd@gmail.com

Abstract

Objective:

This study aimed to characterise the geometry of the human bilateral spiral cochlea by measuring curvature and length.

Method:

Eight subjects were recruited in this study. Magnetic resonance imaging was used to visualise the right and left cochlea. Visualisation of the cochlear spiral was enhanced by T2 weighting and further processing of the raw images. The spirals were divided into three segments: the basal turn, the middle turn and the apex turn. The length and curvature of each segment were non-invasively measured.

Results:

The mean left and right cochlear lengths were 3.11 cm and 3.95 cm, respectively. The measured lengths of the cochlear spiral are consistent with data in the literature derived from anatomical dissections. Overall, the apex turn segment of the cochlea had the greatest degree of curvature (p < 0.05). The mean apex turn segment curvatures for left and right cochleae were 9.65 cm−1 and 10.09 cm−1, respectively.

Conclusion:

A detailed description of the cochlear spiral is provided, using measurements of curvature and length. These data will provide a valuable reference in the development of cochlear implantation procedures for minimising the potential damage during implantation.

Type
Main Articles
Copyright
Copyright © JLO (1984) Limited 2015 

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References

1Skinner, MW, Ketten, DR, Holden, LK, Harding, GW, Smith, PG, Gates, GA et al. CT-derived estimation of cochlear morphology and electrode array position in relation to word recognition in Nucleus-22 recipients. J Assoc Res Otolaryngol 2002;3:332–50CrossRefGoogle ScholarPubMed
2Todd, CA, Naghdy, F, Svehla, MJ. Force application during cochlear implant insertion: an analysis for improvement of surgeon technique. IEEE Trans Biomed Eng 2007;54:1247–55CrossRefGoogle ScholarPubMed
3Zrunek, M, Burian, K. Risk of basilar membrane perforation by intracochlear electrodes. Arch Otorhinolaryngol 1985;242:295–9CrossRefGoogle ScholarPubMed
4Rebscher, SJ, Heilmann, M, Bruszewski, W, Talbot, NH, Snyder, RL, Merzenich, MM. Strategies to improve electrode positioning and safety in cochlear implants. IEEE Trans Biomed Eng 1999;46:340–52CrossRefGoogle ScholarPubMed
5Rebscher, SJ, Talbot, N, Bruszewski, W, Heilmann, M, Brasell, J, Merzenich, MM. A transparent model of the human scala tympani cavity. J Neurosci Methods 1996;64:105–14CrossRefGoogle ScholarPubMed
6Chen, BK, Clark, GM, Jones, R. Evaluation of trajectories and contact pressures for the straight nucleus cochlear implant electrode array - a two-dimensional application of finite element analysis. Med Eng Phys 2003;25:141–7CrossRefGoogle ScholarPubMed
7Adunka, O, Kiefer, J, Unkelbach, MH, Lehnert, T, Gstoettner, W. Development and evaluation of an improved cochlear implant electrode design for electric acoustic stimulation. Laryngoscope 2004;114:1237–41CrossRefGoogle ScholarPubMed
8Xu, J, Briggs, R, Tykocinski, M, Newbold, C, Risi, F, Cowan, R. Micro-focus fluoroscopy - a great tool for electrode development. Cochlear Implants Int 2009;10(suppl 1):115–19CrossRefGoogle ScholarPubMed
9Yoo, SK, Wang, G, Rubinstein, JT, Vannier, MW. Three-dimensional geometric modeling of the cochlea using helico-spiral approximation. IEEE Trans Biomed Eng 2000;47:1392–402CrossRefGoogle ScholarPubMed
10Vogel, U. New approach for 3D imaging and geometry modeling of the human inner ear. ORL J Otorhinolaryngol Relat Spec 1999;61:259–67CrossRefGoogle ScholarPubMed
11Kolston, PJ, Ashmore, JF. Finite element micromechanical modeling of the cochlea in three dimensions. J Acoust Soc Am 1996;99:455–67CrossRefGoogle ScholarPubMed
12Saito, R, Igarashi, M, Alford, BR, Guilford, FR. Anatomical measurement of the sinus tympani. A study of horizontal serial sections of the human temporal bone. Arch Otolaryngol 1971;94:418–25CrossRefGoogle ScholarPubMed
13Xiang, Z-Y, Zhao, X-S, Xiao, S-K, Luo, L-P, Wei, R-Y, Zhao, L-R. Experimental study of the accuracy of Siemens Sensation 4 volume software [in Chinese]. Chinese Journal of Medical Imaging Technology 2003;19:1223–4Google Scholar
14Manoussaki, D, Chadwick, RS, Ketten, DR, Arruda, J, Dimitriadis, EK, O'Malley, JT. The influence of cochlear shape on low-frequency hearing. Proc Natl Acad Sci U S A 2008;105:6162–6CrossRefGoogle ScholarPubMed
15Purcell, DD, Fischbein, NJ, Patel, A, Johnson, J, Lalwani, AK. Two temporal bone computed tomography measurements increase recognition of malformations and predict sensorineural hearing loss. Laryngoscope 2006;116:1439–46CrossRefGoogle ScholarPubMed
16Ozgen, B, Cunnane, ME, Caruso, PA, Curtin, HD. Comparison of 45 degrees oblique reformats with axial reformats in CT evaluation of the vestibular aqueduct. AJNR Am J Neuroradiol 2008;29:30–4CrossRefGoogle ScholarPubMed
17Tanioka, H, Kaga, H, Zusho, H, Araki, T, Sasaki, Y. MR of the endolymphatic duct and sac: findings in Meniere disease. AJNR Am J Neuroradiol 1997;18:4551Google ScholarPubMed
18Niyazov, DM, Andrews, JC, Strelioff, D, Sinha, S, Lufkin, R. Diagnosis of endolymphatic hydrops in vivo with magnetic resonance imaging. Otol Neurotol 2001;22:813–17CrossRefGoogle ScholarPubMed
19Nakashima, T, Naganawa, S, Sugiura, M, Teranishi, M, Sone, M, Hayashi, H et al. Visualization of endolymphatic hydrops in patients with Meniere's disease. Laryngoscope 2007;117:415–20CrossRefGoogle ScholarPubMed
20Hsieh, M-S, Lee, F-P, Tsai, M-D. A virtual reality ear ossicle surgery simulator using three-dimensional computer tomography. J Med Biol Eng 2010;30:5763Google Scholar
21Chen, Y-S, Chen, L-F, Chang, Y-T, Huang, Y-T, Su, T-P, Hsieh, J-C. Quantitative evaluation of brain magnetic resonance images using voxel-based morphometry and Bayesian theorem for patients with bipolar disorder. J Med Biol Eng 2008;28:127–33Google Scholar
22Morita, N, Kariya, S, Farajzadeh Deroee, A, Cureoglu, S, Nomiya, S, Nomiya, R et al. Membranous labyrinth volumes in normal ears and Meniere disease: a three-dimensional reconstruction study. Laryngoscope 2009;119:2216–20CrossRefGoogle ScholarPubMed
23Teranishi, M, Yoshida, T, Katayama, N, Hayashi, H, Otake, H, Nakata, S et al. 3D computerized model of endolymphatic hydrops from specimens of temporal bone. Acta Otolaryngol Suppl 2009;(560):43–7CrossRefGoogle ScholarPubMed
24Migueis, A, Melo Freitas, P, Cordeiro, M. Anatomic evaluation of the membranous labyrinth by imaging: 3D-MRI volume-rendered reconstructions. Rev Laryngol Otol Rhinol (Bord) 2007;128:3740Google ScholarPubMed
25Tomandl, BF, Hastreiter, P, Eberhardt, KE, Rezk-Salama, C, Naraghi, R, Greess, H et al. Virtual labyrinthoscopy: visualization of the inner ear with interactive direct volume rendering. Radiographics 2000;20:547–58CrossRefGoogle ScholarPubMed
26Kha, HN, Chen, BK, Clark, GM. 3D finite element analyses of insertion of the Nucleus standard straight and the Contour electrode arrays into the human cochlea. J Biomech 2007;40:2796–805CrossRefGoogle ScholarPubMed
27Hanekom, T. Three-dimensional spiraling finite element model of the electrically stimulated cochlea. Ear Hear 2001;22:300–15CrossRefGoogle ScholarPubMed
28Lane, JI, Ward, H, Witte, RJ, Bernstein, MA, Driscoll, CL. 3-T imaging of the cochlear nerve and labyrinth in cochlear-implant candidates: 3D fast recovery fast spin-echo versus 3D constructive interference in the steady state techniques. AJNR Am J Neuroradiol 2004;25:618–22Google ScholarPubMed
29Chen, JL, Gittleman, A, Barnes, PD, Chang, KW. Utility of temporal bone computed tomographic measurements in the evaluation of inner ear malformations. Arch Otolaryngol Head Neck Surg 2008;134:50–6CrossRefGoogle ScholarPubMed
30Yost, WA. Fundamentals of Hearing: An Introduction, 4th edn.San Diego: Academic Press, 2000CrossRefGoogle Scholar