Patient-specific estimation of detailed cochlear shape from clinical CT images

H Martin Kjer*, Jens Fagertun, Wilhelm Wimmer, Nicolas Gerber, Sergio Vera, Livia Barazzetti, Nerea Mangado, Mario Ceresa, Gemma Piella, Thomas Stark, Martin Stauber, Mauricio Reyes, Stefan Weber, Marco Caversaccio, Miguel Ángel González Ballester, Rasmus Reinhold Paulsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A personalized estimation of the cochlear shape can be used to create computational anatomical models to aid cochlear implant (CI) surgery and CI audio processor programming ultimately resulting in improved hearing restoration. The purpose of this work is to develop and test a method for estimation of the detailed patient-specific cochlear shape from CT images. From a collection of temporal bone [Formula: see text]CT images, we build a cochlear statistical deformation model (SDM), which is a description of how a human cochlea deforms to represent the observed anatomical variability. The model is used for regularization of a non-rigid image registration procedure between a patient CT scan and a [Formula: see text]CT image, allowing us to estimate the detailed patient-specific cochlear shape. We test the accuracy and precision of the predicted cochlear shape using both [Formula: see text]CT and CT images. The evaluation is based on classic generic metrics, where we achieve competitive accuracy with the state-of-the-art methods for the task. Additionally, we expand the evaluation with a few anatomically specific scores. The paper presents the process of building and using the SDM of the cochlea. Compared to current best practice, we demonstrate competitive performance and some useful properties of our method.
Original languageEnglish
JournalInternational Journal of Computer Assisted Radiology and Surgery
Volume13
Issue number3
Pages (from-to)389–396
ISSN1861-6410
DOIs
Publication statusPublished - 2018

Keywords

  • CT
  • Cochlear implant
  • Intracochlear anatomy
  • Micro-CT
  • Segmentation
  • Statistical shape model

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