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Research ArticleHead & Neck

Diagnostic Performance of Conebeam CT Pixel Values in Active Fenestral Otosclerosis

F. Deng, P. Touska, K.L. Reinshagen, H.D. Curtin and A.F. Juliano
American Journal of Neuroradiology September 2021, 42 (9) 1667-1670; DOI: https://doi.org/10.3174/ajnr.A7192
F. Deng
aFrom the Department of Radiology (F.D.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
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P. Touska
bDepartment of Radiology (P.T), Guy’s Hospital, Guy’s and St. Thomas’ Hospitals National Health Service Foundation Trust, London, UK
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K.L. Reinshagen
cDepartment of Radiology (K.L.R, H.D.C., A.F.J.), Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts.
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H.D. Curtin
cDepartment of Radiology (K.L.R, H.D.C., A.F.J.), Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts.
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A.F. Juliano
cDepartment of Radiology (K.L.R, H.D.C., A.F.J.), Massachusetts Eye and Ear, Harvard Medical School, Boston, Massachusetts.
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Abstract

BACKGROUND AND PURPOSE: Quantitative bone densitometry on multidetector CT of the temporal bone is a diagnostic adjunct for otosclerosis in its active (spongiotic) phase, but translating this technique to conebeam CT is limited by the technical variability of conebeam CT pixel values. The purpose of this study was to evaluate the performance of internally calibrated conebeam CT pixel value measurements that can enable the determination of active fenestral otosclerosis (otospongiosis).

MATERIALS AND METHODS: This study included 37 ears in 22 patients with a clinical diagnosis of otospongiosis in those ears and 35 ears in 22 control patients without the diagnosis. Temporal bone conebeam CT was performed. ROIs were set anterior to the oval window, in the lateral semicircular canal bone island, and in a nearby aerated space. Mean conebeam CT pixel values in these regions determined the relative attenuation ratio of the area anterior to the oval window normalized to normal otic capsule bone and air.

RESULTS: The relative attenuation ratio for cases of otospongiosis was significantly lower than that for controls (P < .001). Based on receiver operating characteristic analysis, the optimal cutoff relative attenuation ratio was 0.876, which had an accuracy of 97.2% for the diagnosis of otospongiosis.

CONCLUSIONS: Internally calibrated pixel value ratios in temporal bone conebeam CT can feasibly help diagnose active/spongiotic-phase fenestral otosclerosis in an objective manner.

ABBREVIATIONS:

CBCT
conebeam CT
MDCT
multidetector CT
RAR
relative attenuation ratio
  • © 2021 by American Journal of Neuroradiology
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American Journal of Neuroradiology: 42 (9)
American Journal of Neuroradiology
Vol. 42, Issue 9
1 Sep 2021
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Diagnostic Performance of Conebeam CT Pixel Values in Active Fenestral Otosclerosis
F. Deng, P. Touska, K.L. Reinshagen, H.D. Curtin, A.F. Juliano
American Journal of Neuroradiology Sep 2021, 42 (9) 1667-1670; DOI: 10.3174/ajnr.A7192

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Diagnostic Performance of Conebeam CT Pixel Values in Active Fenestral Otosclerosis
F. Deng, P. Touska, K.L. Reinshagen, H.D. Curtin, A.F. Juliano
American Journal of Neuroradiology Sep 2021, 42 (9) 1667-1670; DOI: 10.3174/ajnr.A7192
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