High-speed flat-detector computed tomography for temporal bone imaging and postoperative control of cochlear implants

Eisenhut F, Manhart M, Thimsen V, Mantsopoulos K, Iro H, Hornung J, Dörfler A, Lang S, Taha L (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Neuroradiology Springer Verlag (Germany)

Abstract

Purpose: Flat-detector computed tomography (FD-CT) is the standard for cochlear implant (CI) imaging. FD-CT systems differ in technical characteristics. Our aim was an evaluation of two different FD-CT generations with different protocols and hardware regarding image quality, radiation dose, and scan time. Methods: Two temporal bone specimens (− / + CI = TB0/TB1) were scanned using three different scanners: two FD-CT systems with different scanning protocols (standard FD-CT: 20 s 70 kV, 20 s 109 kV; high-speed FD-CT [HS-FD-CT]: 7 s 109 kV, 9 s 109 kV, 14 s 72 kV) and MS-CT (5 s 120 kV). Acquired datasets were evaluated in consensus reading regarding qualitative and quantitative parameters: addressing CI- and cochlea-specific parameters, cochlea delineation, lamina spiralis ossea visibility, distinction of single CI electrodes, determination of intracochlear implant position, stapes delineation, and mastoidal septation were assessed. Addressing protocol-specific parameters, radiation dose (dose-length-product/DLP), and scan time were assessed. Results: Two HS-FD-CT protocols (14 s/9 s) provide higher or equivalent diagnostic information regarding CI- and cochlea-specific parameters compared to both standard FD-CT protocols. The fastest HS-FD-CT protocol (7 s)—providing inferior diagnostic information compared to all other FD-CT protocols—still exceeds MS-CT. The highest DLP was recorded for the 14 s HS-FD-CT protocol (TB1 = 956 mGycm); the lowest DLPs were recorded for the 7 s HS-FD-CT protocol (TB0 = 188 mGycm) and for MS-CT (TB0 = 138 mGycm), respectively. HS-FD-CT allows a significant reduction of scan time compared to standard FD-CT. Conclusion: High-speed FD-CT improves visualization of temporal bone anatomy and postoperative assessment of CIs by combining excellent image quality, fast scan time, and reasonable radiation exposure.

Authors with CRIS profile

Felix Eisenhut Department of Neuroradiology Vivian Thimsen Department of Otorhinolaryngology – Head and Neck Surgery Konstantinos Mantsopoulos Department of Otorhinolaryngology – Head and Neck Surgery Heinrich Iro Lehrstuhl für Hals-, Nasen- und Ohrenheilkunde Joachim Hornung Department of Otorhinolaryngology – Head and Neck Surgery Arnd Dörfler Department of Neuroradiology Stefan Lang Department of Neuroradiology Lava Taha Department of Otorhinolaryngology – Head and Neck Surgery

How to cite

APA:

Eisenhut, F., Manhart, M., Thimsen, V., Mantsopoulos, K., Iro, H., Hornung, J.,... Taha, L. (2022). High-speed flat-detector computed tomography for temporal bone imaging and postoperative control of cochlear implants. Neuroradiology. https://dx.doi.org/10.1007/s00234-022-02940-x

MLA:

Eisenhut, Felix, et al. "High-speed flat-detector computed tomography for temporal bone imaging and postoperative control of cochlear implants." Neuroradiology (2022).

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