Demagnetization of Cochlear Implants and Temperature Changes in 3.0T MRI Environment

Majdani, Omid; Leinung, Martin; Rau, Thomas S.; Akbarian, Arash; Zimmerling, Martin; Lenarz, Minoo; Lenarz, Thomas; Labadie, Robert F.

doi:10.1016/j.otohns.2008.07.026

Cited by 67 publications

(39 citation statements)

References 13 publications

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“…Demagnetization is a potential problem which depends on the position of the magnet in relation to the magnetic field of the scanner (11). Implant displacement …”

Section: Discussionmentioning

confidence: 99%

MRI Artifacts and Cochlear Implant Positioning at 3 T In Vivo

Todt

Rademacher

Mittmann

et al. 2015

Otology &Amp; Neurotology

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“…Demagnetization is a potential problem which depends on the position of the magnet in relation to the magnetic field of the scanner (11). Implant displacement …”

Section: Discussionmentioning

confidence: 99%

MRI Artifacts and Cochlear Implant Positioning at 3 T In Vivo

Todt

Rademacher

Mittmann

et al. 2015

Otology &Amp; Neurotology

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“…Although previous studies of normal human binaural processing have used magnetic resonance imaging of the inferior colliculus (Thompson et al, 2006), this technique is contraindicated for CI users (Majdani et al, 2008). Binaural interaction can also be studied using electrophysiology as shown in normal hearing individuals (Wada and Starr, 1989;Furst et al, 1990;Jiang and Tierney, 1996;Goksoy et al, 2005) as well as bilateral CI users (adults: He et al, 2010; children: Gordon et al, 2007a;cats: Smith and Delgutte, 2007).…”

Section: Introductionmentioning

confidence: 99%

Binaural Interactions Develop in the Auditory Brainstem of Children Who Are Deaf: Effects of Place and Level of Bilateral Electrical Stimulation

Gordon¹,

Salloum²,

Toor³

et al. 2012

J. Neurosci.

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Bilateral cochlear implants (CIs) might promote development of binaural hearing required to localize sound sources and hear speech in noise for children who are deaf. These hearing skills improve in children implanted bilaterally but remain poorer than normal. We thus questioned whether the deaf and immature human auditory system is able to integrate input delivered from bilateral CIs. Using electrophysiological measures of brainstem activity that include the Binaural Difference (BD), a measure of binaural processing, we showed that a period of unilateral deprivation before bilateral CI use prolonged response latencies but that amplitudes were not significantly affected. Tonotopic organization was retained to some extent as evidenced by an elimination of the BD with large mismatches in place of stimulation between the two CIs. Smaller place mismatches did not affect BD latency or amplitude, indicating that the tonotopic organization of the auditory brainstem is underdeveloped and/or not well used by CI stimulation. Finally, BD amplitudes decreased when the intensity of bilateral stimulation became weighted to one side and this corresponded to a perceptual shift of sound away from midline toward the side of increased intensity. In summary, bilateral CI stimulation is processed by the developing human auditory brainstem leading to perceptual changes in sound location and potentially improving hearing for children who are deaf.

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“…Cadaver studies have shown that the force required to fracture the CI receiver bed was much higher than that generated in a 1.5-T MRI scanner (7,8). Although demagnetization of the internal magnet is a concern, in practice this effect has been minimal even after multiple MR images (5,9,10), and the effect probably is only significant with 3-T scanners (11).…”

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confidence: 99%