PT - JOURNAL ARTICLE AU - Helal, R.A. AU - Jacob, R. AU - Elshinnawy, M.A. AU - Othman, A.I. AU - Al-Dhamari, I.M. AU - Paulus, D.W. AU - Abdelaziz, T.T. TI - Cone-beam CT versus Multidetector CT in Postoperative Cochlear Implant Imaging: Evaluation of Image Quality and Radiation Dose AID - 10.3174/ajnr.A6894 DP - 2021 Feb 01 TA - American Journal of Neuroradiology PG - 362--367 VI - 42 IP - 2 4099 - http://www.ajnr.org/content/42/2/362.short 4100 - http://www.ajnr.org/content/42/2/362.full SO - Am. J. Neuroradiol.2021 Feb 01; 42 AB - BACKGROUND AND PURPOSE: Cone-beam CT is being increasingly used in head and neck imaging. We compared cone-beam CT with multidetector CT to assess postoperative implant placement and delineate finer anatomic structures, image quality, and radiation dose used.MATERIALS AND METHODS: This retrospective multicenter study included 51 patients with cochlear implants and postoperative imaging via temporal bone cone-beam CT (n = 32 ears) or multidetector CT (n = 19 ears) between 2012 and 2017. We evaluated the visualization quality of single electrode contacts, the scalar position of the electrodes, cochlear walls, mastoid facial canal, metallic artifacts (using a 4-level visual score), and the ability to measure the insertion angle of the electrodes. The signal-to-noise ratio and radiation dose were also evaluated.RESULTS: Cone-beam CT was more sensitive for visualizing the scalar position of the electrodes (P = .046), cochlear outer wall (P = .001), single electrode contacts (P < .001), and osseous spiral lamina (P = .004) and had fewer metallic artifacts (P < .001). However, there were no significant differences between both methods in visualization of the modiolus (P = .37), cochlear inner wall (P > .99), and mastoid facial canal wall (P = .07) and the ability to measure the insertion angle of the electrodes (P > .99). The conebeam CT group had significantly lower dose-length product (P < .001), but multidetector CT showed a higher signal-to-noise ratio in both bone and air (P = .22 and P = .001).CONCLUSIONS: Cone-beam CT in patients with cochlear implants provides images with higher spatial resolution and fewer metallic artifacts than multidetector CT at a relatively lower radiation dose.CBCTcone-beam CTCIcochlear implantMDCTmultidetector CT