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Curvature measurement of human bilateral cochleae

Published online by Cambridge University Press:  21 September 2015

J-F Yu ,
K-C Lee ,
Y-L Wan  and
Y-C Peng
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: [email protected]
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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.

Keywords

EarCochleaMagnetic Resonance ImagingImage Processing, Computer-Assisted
Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 129 , Issue 11 , November 2015 , pp. 1085 - 1090
Copyright
Copyright © JLO (1984) Limited 2015 

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