3T MRI-based estimation of scalar cochlear implant electrode position

Tek, F; Boga, E; Gehl, H; Seitz, D; Scholtz, Lars‐Uwe; Sudhoff, Holger; Todt, Ingo

doi:10.14639/0392-100x-2309

Cited by 7 publications

(7 citation statements)

References 14 publications

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“…Imaging-based visualization of the cochlea after CI allows for the estimation of perimodiolar electrode position (25) and the localization of lateral wall electrodes in the basal turn (26) when performing this specific positioning. Postsurgical MRI scanning has been shown to identify brainstem infarction, which explains the new occurrence of vertigo after CI in some cases (27).…”

Section: Discussionmentioning

confidence: 99%

MRI Observation After Intralabyrinthine and Vestibular Schwannoma Resection and Cochlear Implantation

et al. 2020

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Objective: MRI observation is part of the regular follow-up after vestibular schwannoma (VS) or intralabyrinthine schwannoma (ILS) resection. Because cochlear implantation (CI) after resection is part of the audiological rehabilitation process, the magnet resonance imaging (MRI) behavior of CI systems needs to be considered. In light of recent developments in MRI artifact positioning and pain prevention, this study evaluates reproducible MRI observations after tumor resection and CI surgery as part of follow-up. Methods: In a retrospective study, we evaluated 9 patients with a T1 KM, T2 sequence MRI observation, and cone beam computed tomography (CBCT) after ILS/VS resection and CI. In all but one case, a CI with a diametrically bipolar magnet and a receiver positioned 8-9 cm behind the external auditory canal was performed. Results: In all but one case, MRI observation allowed for a pain-free visual assessment of the intralabyrinthine and internal auditory canal (IAC) regions. In one case, a painful dislodgement of the receiver magnet occurred. Conclusion: MRI follow-up after ILS and VS resection and CI is reproducibly possible. Implant choice and positioning should be considered before implantation to allow for a pain-free visual assessment afterward. This finding allows for the first time a widening of the indication into this patient group.

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Section: Discussionmentioning

confidence: 99%

MRI Observation After Intralabyrinthine and Vestibular Schwannoma Resection and Cochlear Implantation

et al. 2020

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“…This reached technical MRI refinement allows visual determination of the basilar membrane for the first time, underlining the important development of visual resolution in comparison to previous studies 23 , 24 . Our findings qualify the estimation of translocations for lateral wall electrodes and modiolar electrodes.…”

Section: Discussionmentioning

confidence: 68%

“…Initial evaluations of MRI scanning showed the general possibility of estimating electrode translocation of perimodiolar electrodes 23 , but limitations to visual resolution persisted 24 . Model testing allowed the optimization of MRI sequence patterns to solve this problem 25 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of cochlear implant electrode scalar position by 3 Tesla magnet resonance imaging

Riemann

Scholtz

Gehl

et al. 2021

Sci Rep

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The estimation of scalar electrode position is a central point of quality control during the cochlear implant procedure. Ionic radiation is a disadvantage of commonly used radiologic estimation of electrode position. Recent developments in the field of cochlear implant magnets, implant receiver magnet position, and MRI sequence usage allow the postoperative evaluation of inner ear changes after cochlear implantation. The aim of the present study was to evaluate the position of lateral wall and modiolar cochlear implant electrodes using 3 T MRI scanning. In a prospective study, we evaluated 20 patients (10× Med-El Flex 28; 5× HFMS AB and 5× SlimJ AB) with a 3 T MRI and a T2 2D Drive MS sequence (voxel size: 0.3 × 0.3 × 0.9 mm) for the estimation of the intracochlear position of the cochlear implant electrode. In all cases, MRI allowed a determination of the electrode position in relation to the basilar membrane. This observation made the estimation of 19 scala tympani electrode positions and a single case of electrode translocation possible. 3 T MRI scanning allows the estimation of lateral wall and modiolar electrode intracochlear scalar positions.

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“…2 Recent publications showed the opportunity to evaluate the CI electrode position by MRI in vivo and underline that the magnet artifact is a solved problem by specific implant positioning, head positioning, and choice of sequence. [2][3][4] In vitro testing allows the transfer of specific information to improve the in vivo situation. Models or in vitro observation in temporal bones has been used for the computed tomography (CT) evaluation of electrode position, 5 the estimation of force behavior during insertion, 6 and evaluation of intracochlear pressure during insertion in temporal bones 7 and different models.…”

Section: Introductionmentioning

confidence: 99%

Cochlear Model for the Evaluation of MRI Sequences and Cochlear Implant Electrode Pattern at 3T

Scholtz

Riemann

Gehl

et al. 2021

Annals of Otology and Neurotology

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Introduction Cochlear implant (CI) magnets and surgical techniques (e.g., positioning) have made an impact on the relationship between CI and magnetic resonance imaging (MRI) by solving the problem of pain and artifact. Recent investigations displayed the possibility to evaluate the CI electrode position by MRI in vivo. However, further improved perceptual quality is needed to allow an improved evaluation of the electrode. Aims The aim of this study was to assess a cochlear model for the examination of CI electrode pattern and MRI sequences in vitro. Materials and Methods We investigated CI electrodes in a fluid-filled three-dimensional artificial scala tympani model combined with a fluid package in a 3T MRI scanner. Different high-resolution T2 sequences (0.6–0.2 mm voxel size) were used for the visual electrode pattern evaluation for finding an optimized sequence. Results Artificial models can be used to evaluate MRI characteristics of CI electrodes. In our scanner configuration, a 0.3 mm voxel and 0.9 mm slice thickness sequence showed the best compromise between resolution and scanning time. Conclusion and Significance MRI model-based testing can be performed in vitro to evaluate CI electrodes’ pattern and to optimize sequences. An MRI model is a tool for in vitro testing of MRI sequences and might help for future in vivo applications.

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3T MRI-based estimation of scalar cochlear implant electrode position

Cited by 7 publications

References 14 publications

MRI Observation After Intralabyrinthine and Vestibular Schwannoma Resection and Cochlear Implantation

MRI Observation After Intralabyrinthine and Vestibular Schwannoma Resection and Cochlear Implantation

Evaluation of cochlear implant electrode scalar position by 3 Tesla magnet resonance imaging

Cochlear Model for the Evaluation of MRI Sequences and Cochlear Implant Electrode Pattern at 3T

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