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Related Concept Videos

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Computed Tomography

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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Prismatic Beams: Problem Solving01:15

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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Related Experiment Video

Updated: Feb 7, 2026

Robotic Cochlear Implantation for Direct Cochlear Access
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Assessing Cochlear Length Using Cone Beam Computed Tomography in Adults With Cochlear Implants.

Fadwa F Alnafjan1, Stuart M Allan2, Catherine M McMahon1

  • 1Macquarie University.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|August 7, 2018
PubMed
Summary

A new method using cone beam CT (CBCT) accurately measures cochlear length in adults with cochlear implants. This technique aids in improving cochlear implant electrode design and surgical outcomes.

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Area of Science:

  • Otolaryngology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Cochlear implant electrode design and surgical techniques can be improved by accurately measuring cochlear length.
  • Computed tomography (CT) has limitations due to metal artifacts and high radiation levels.
  • Cone beam CT (CBCT) offers lower radiation exposure and good image quality for assessing cochlear implants.

Purpose of the Study:

  • To develop a clinically viable technique for measuring cochlear length in adult cochlear implant recipients.
  • To utilize CBCT imaging combined with known implant dimensions and cadaveric data.

Main Methods:

  • Reviewed 100 CBCT temporal bone images from ears with Cochlear straight or perimodiolar arrays.
  • Two independent examiners analyzed the CBCT images.

Main Results:

  • Outer-wall cochlear length ranged from 27.44 to 35.91 mm (mean 32.24 mm) using straight arrays.
  • Inner-wall cochlear length ranged from 17.8 to 22.24 mm (mean 19.43 mm) using perimodiolar arrays.

Conclusions:

  • A novel and feasible method for calculating outer- and inner-wall cochlear length using CBCT images in clinical settings has been established.