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06.12.2023 | Original Article

Photon Counting Versus Energy-integrated Detector CT in Detection of Superior Semicircular Canal Dehiscence

verfasst von: Nathan S. Doyle, John C. Benson, Carrie M. Carr, Felix E. Diehn, Matthew L. Carlson, Shuai Leng, John I. Lane

Erschienen in: Clinical Neuroradiology | Ausgabe 1/2024

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Abstract

Background

Superior semicircular canal dehiscence (SSCD), an osseous defect overlying the SSC, is associated with a constellation of audiovestibular symptoms. This study sought to compare conventional energy-integrated detector (EID) computed tomography (CT) to photon-counting detector (PCD)-CT in the detection of SSCD.

Material and Methods

Included patients were prospectively recruited to undergo a temporal bone CT on both EID-CT and PCD-CT scanners. Two blinded neuroradiologists reviewed both sets of images for 1) the presence or absence of SSCD (graded as present, absent, or indeterminate), and 2) the width of the bone overlying the SSC (if present). Any discrepancies in the presence or absence of SSCD were agreed upon by consensus.

Results

In the study 31 patients were evaluated, for a total of 60 individual temporal bones (2 were excluded). Regarding SSCD presence or absence, there was substantial agreement between EID-CT and PCD-CT (k = 0.76; 95% confidence interval, CI 0.54–0.97); however, SSCD was present in only 9 (15.0%) temporal bones on PCD-CT, while EID-CT examinations were interpreted as being positive in 14 (23.3%) temporal bones. This yielded a false positive rate of 8.3% on EID-CT. The bone overlying the SSC was thinner on EID-CT images (0.66 mm; SD = 0.64) than on PCD-CT images (0.72 mm; SD = 0.66) (p < 0.001).

Conclusion

The EID-CT examinations tend to overcall the presence of SSCD compared to PCD-CT and also underestimate the thickness of bone overlying the SSC.

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Titel: Photon Counting Versus Energy-integrated Detector CT in Detection of Superior Semicircular Canal Dehiscence
verfasst von: Nathan S. Doyle
John C. Benson
Carrie M. Carr
Felix E. Diehn
Matthew L. Carlson
Shuai Leng
John I. Lane
Publikationsdatum: 06.12.2023
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Neuroradiology / Ausgabe 1/2024
Print ISSN: 1869-1439
Elektronische ISSN: 1869-1447
DOI: https://doi.org/10.1007/s00062-023-01368-x

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Photon Counting Versus Energy-integrated Detector CT in Detection of Superior Semicircular Canal Dehiscence