Finite Element Model of Human Cochlea Considering of the Helicotrema Size

Xu, Li; Ta, Na; Rao, Zhu Shi; Tian, Jia Bin

doi:10.4028/www.scientific.net/amm.456.576

Cited by 2 publications

(1 citation statement)

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“…Furthermore, the HLL and HAL values presented herein can be used to develop more anatomically accurate numerical models of the human cochlea. Current models have made approximations regarding the size of the helicotrema, and the detailed measurements from this study can be integrated to produce more accurate biomechanical models of the cochlear apex [21,31].…”

Section: Discussionmentioning

confidence: 99%

Characterization of the human helicotrema: implications for cochlear duct length and frequency mapping

Helpard

Rask‐Andersen

et al. 2020

J of Otolaryngol - Head & Neck Surg

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Background: Despite significant anatomical variation amongst patients, cochlear implant frequency-mapping has traditionally followed a patient-independent approach. Basilar membrane (BM) length is required for patient-specific frequency-mapping, however cochlear duct length (CDL) measurements generally extend to the apical tip of the entire cochlea or have no clearly defined end-point. By characterizing the length between the end of the BM and the apical tip of the entire cochlea (helicotrema length), current CDL models can be corrected to obtain the appropriate BM length. Synchrotron radiation phase-contrast imaging has made this analysis possible due to the soft-tissue contrast through the entire cochlear apex. Methods: Helicotrema linear length and helicotrema angular length measurements were performed on synchrotron radiation phase-contrast imaging data of 14 cadaveric human cochleae. On a subset of six samples, the CDL to the apical tip of the entire cochlea (CDL TIP) and the BM length (CDL BM) were determined. Regression analysis was performed to assess the relationship between CDL TIP and CDL BM. Results: The mean helicotrema linear length and helicotrema angular length values were 1.6 ± 0.9 mm and 67.8 ± 37.9 degrees, respectively. Regression analysis revealed the following relationship between CDL TIP and CDL BM : CDL BM = 0.88(CDL TIP) + 3.71 (R 2 = 0.995). Conclusion: This is the first known study to characterize the length of the helicotrema in the context of CDL measurements. It was determined that the distance between the end of the BM and the tip of the entire cochlea is clinically consequential. A relationship was determined that can predict the BM length of an individual patient based on their respective CDL measured to the apical tip of the cochlea.

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Section: Discussionmentioning

confidence: 99%