Journal of Audiology & Otology

The Korean Audiology Society (대한청각학회)
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Measurement of Skull Size on Computed Tomography Images for Developing a Bone Conduction Headset Suitable for the Korean Standard Head Size

  • Ku, Cheol Hyo (Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine) ;
  • Kim, Soo Won (Department of Medicine, Yonsei University Wonju College of Medicine) ;
  • Kim, Ji Young (Department of Medicine, Yonsei University Wonju College of Medicine) ;
  • Paik, Seung Won (Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine) ;
  • Yang, Hui Joon (Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine) ;
  • Lee, Ji Hyeon (Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine) ;
  • Seo, Young Joon (Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine)
  • Received : 2019.07.16
  • Accepted : 2019.08.10
  • Published : 2020.01.20
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Abstract

Background and Objectives: We aimed to measure the head dimensions on computed tomography (CT) images, to compare them to directly measured head dimensions, and to predict a new parameter of bone thickness for aiding bone conduction implant (BCI) placement. Subjects and Methods: We reviewed the facial and mandibular bone CT images of 406 patients. Their head sizes were analyzed using five parameters included in the 6th Size Korea project, and they were divided into age groups (ranging from the 10s to the 80s). We compared the head length, head width, sagittal arc, bitragion arc, and head circumference in the CT and Size Korea groups. We also added the parameter bone thickness for aiding BCI placement. Results: All the head size parameters measured using CT were significantly smaller than those measured directly, with head length showing the smallest difference at 7.85 mm. The differences in the other four parameters between the two groups according to patient age were not statistically significantly different. Bone thickness had the highest value of 4.89±0.93 mm in the 70s and the lowest value of 4.10±0.99 mm in the 10s. Bone thickness also significantly correlated with head width (p=0.038). Conclusions: Our findings suggested that the CT and direct measurements yielded consistent data. Moreover, CT enabled the measurement of bone sizes, including bone thickness, that are impossible to measure directly. CT measurements may complement direct measurements in the Size Korea data when used for developing bone conduction hearing devices (BCIs and headsets) for the Korean population.

Keywords

Acknowledgement

This work was supported by the Technology Innovation Program (or Industrial Strategic Technology Development Program) (20001819) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea) and by Basic Science research program through the national research foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2019K1A3A1A47000527).

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