Intra- and Interobserver Variability of Cochlear Length Measurements in Clinical CT.
Hypothesis: The cochlear A-value measurement exhibits significant inter- and intraobserver variability, and its accuracy is dependent on the visualization method in clinical computed tomography (CT) images of the cochlea.Background: An accurate estimate of the cochlear duct length (CDL) can be used...
| Publicado en: | Otology & Neurotology Vol. 38; no. 6; pp. 828 - 833 |
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| Autores principales: | , , , , , , , , |
| Formato: | diagnostic images research tables/charts Journal Article |
| Publicado: |
Lippincott Williams & Wilkins
Jul2017
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=123582527&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 123582527 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15317129 I6D jtl: Otology & Neurotology issn: 15317129 maglogo: N pubinfo: dt: Jul2017 vid: 38 iid: 6 pid: 433 pub: Lippincott Williams & Wilkins place: Baltimore, Maryland artinfo: ui: 123582527 123582527 NLM28383464 123582527 10.1097/MAO.0000000000001411 NLM28383464 123582527 ppf: 828 ppct: 5 formats: tig: atl: Intra- and Interobserver Variability of Cochlear Length Measurements in Clinical CT. aug: au: Iyaniwura, John E. Elfarnawany, Mai Riyahi-Alam, Sadegh Sharma, Manas Kassam, Zahra Bureau, Yves Parnes, Lorne S. Ladak, Hanif M. Agrawal, Sumit K. affil: Biomedical Engineering Graduate Program, Western University, London, Ontario, Canada sug: subj: Cochlea Cochlea Anatomy and Histology Tomography, X-Ray Computed Methods Reproducibility of Results Algorithms Observer Bias Human ab: Hypothesis: The cochlear A-value measurement exhibits significant inter- and intraobserver variability, and its accuracy is dependent on the visualization method in clinical computed tomography (CT) images of the cochlea.Background: An accurate estimate of the cochlear duct length (CDL) can be used to determine electrode choice, and frequency map the cochlea based on the Greenwood equation. Studies have described estimating the CDL using a single A-value measurement, however the observer variability has not been assessed.Methods: Clinical and micro-CT images of 20 cadaveric cochleae were acquired. Four specialists measured A-values on clinical CT images using both standard views and multiplanar reconstructed (MPR) views. Measurements were repeated to assess for intraobserver variability. Observer variabilities were evaluated using intra-class correlation and absolute differences. Accuracy was evaluated by comparison to the gold standard micro-CT images of the same specimens.Results: Interobserver variability was good (average absolute difference: 0.77 ± 0.42 mm) using standard views and fair (average absolute difference: 0.90 ± 0.31 mm) using MPR views. Intraobserver variability had an average absolute difference of 0.31 ± 0.09 mm for the standard views and 0.38 ± 0.17 mm for the MPR views. MPR view measurements were more accurate than standard views, with average relative errors of 9.5 and 14.5%, respectively.Conclusion: There was significant observer variability in A-value measurements using both the standard and MPR views. Creating the MPR views increased variability between experts, however MPR views yielded more accurate results. Automated A-value measurement algorithms may help to reduce variability and increase accuracy in the future. pubtype: Academic Journal doctype: diagnostic images research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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