ArticleJournal of otolaryngology - head & neck surgery = Le Journal d'oto-rhino-laryngologie et de chirurgie cervico-faciale2018
An automated A-value measurement tool for accurate cochlear duct length estimation.
Article in Journal of otolaryngology - head & neck surgery = Le Journal d'oto-rhino-laryngologie et de chirurgie cervico-faciale, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- X-ray guided anatomy-based fitting: The validity of OTOPLAN.PloS one · 2024Article
- Method to estimate the basal turn length in inner ear malformation types.Scientific reports · 2023Article
- A novel cochlear measurement that predicts inner-ear malformation.Scientific reports · 2021Article
- Cochlear duct length and cochlear distance on preoperative CT: imaging markers for estimating insertion depth angle of cochlear implant electrode.European radiology · 2021Article
- Automatic segmentation of inner ear on CT-scan using auto-context convolutional neural network.Scientific reports · 2021Article
- Practicable assessment of cochlear size and shape from clinical CT images.Scientific reports · 2021Article
- Research software in cochlear duct length estimation, Greenwood frequency mapping and CI electrode array length simulation.World journal of otorhinolaryngology - head and neck surgery · 2021Article
- Cone beam CT for perioperative imaging in hearing preservation Cochlear implantation - a human cadaveric study.Journal of otolaryngology - head & neck surgery = Le Journal d'oto-rhino-laryngologie et de chirurgie cervico-faciale · 2019Article
- Validating a New Tablet-based Tool in the Determination of Cochlear Implant Angular Insertion Depth.Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology · 2019Article
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4 authors.
Funding
Abstract
backgroundThere has been renewed interest in the cochlear duct length (CDL) for preoperative cochlear implant electrode selection and postoperative generation of patient-specific frequency maps. The CDL can be estimated by measuring the A-value, which is defined as the length between the round window and the furthest point on the basal turn. Unfortunately, there is significant intra- and inter-observer variability when these measurements are made clinically. The objective of this study was to develop an automated A-value measurement algorithm to improve accuracy and eliminate observer variability.
methodClinical and micro-CT images of 20 cadaveric cochleae specimens were acquired. The micro-CT of one sample was chosen as the atlas, and A-value fiducials were placed onto that image. Image registration (rigid affine and non-rigid B-spline) was applied between the atlas and the 19 remaining clinical CT images. The registration transform was applied to the A-value fiducials, and the A-value was then automatically calculated for each specimen. High resolution micro-CT images of the same 19 specimens were used to measure the gold standard A-values for comparison against the manual and automated methods.
resultsThe registration algorithm had excellent qualitative overlap between the atlas and target images. The automated method eliminated the observer variability and the systematic underestimation by experts. Manual measurement of the A-value on clinical CT had a mean error of 9.5 ± 4.3% compared to micro-CT, and this improved to an error of 2.7 ± 2.1% using the automated algorithm. Both the automated and manual methods correlated significantly with the gold standard micro-CT A-values (r = 0.70, p < 0.01 and r = 0.69, p < 0.01, respectively).
conclusionAn automated A-value measurement tool using atlas-based registration methods was successfully developed and validated. The automated method eliminated the observer variability and improved accuracy as compared to manual measurements by experts. This open-source tool has the potential to benefit cochlear implant recipients in the future.
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