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KMID : 0361020010440020144
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Korean Journal of Otolaryngology - Head and Neck Surgery
2001 Volume.44 No. 2 p.144 ~ p.147
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Changes in Resonance Frequency and Length of External Auditory Canal in Relation to Age
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정향숙/Hyang Sook Jeong
구한얼/이상민/구수권/이상화/유태현/Han Eol Koo/Sang Min Lee/Soo Kweon Koo/Sang Hwa Lee/Tai Hyun Yu
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Abstract
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Background and Objectives : With the currently available diagnostic procedure, hearing impaired children are diagnosed at an early age and hearing aids are fitted soon thereafter. Thus, appropriateness of using available correction methods for
adult
ears and ear models for determining and predicting hearing aid characteristics for these children need to be examined. The objectives of this study are to create a database of resonance frequency and length of external auditory canal(EAC) in all
age
groups and to adjust the peak frequency response of hearing aid system to take account of the changing resonance peak frequency as child gets older. Materials and Method : We studied 437 ears with no age limitation. We measured rear ear unaided
response(REUR) with Rastronics frequency response analyzer and external ear canal length using silastic tube under microscopic or otoscopic finding. Statistical analyses were performed to determine age differences. Results : Ear canal length
increased
with age, and an adult value was achieved by the age of 14 years. Resonance frequency decreased with age, and reached to an adult value by the age of 9 years. There was significant relationship between ear canal length and resonance frequency.
Conclusion : Alteration in resonance frequency with age may have practical implications by affecting the insertion gain of hearing aid system in children. The data may be used as useful adjustment factors to correct the current hearing aid system
in
children.
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