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The effect of large single radiation doses on cochlear implant function: implications for radiosurgery
Thomas Klenzner1, Johannes Lutterbach, Antje Aschendorff
1Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital Freiburg, Killianstrasse 5, 79106 Freiburg, Germany. Klenzner@hno.ukl.uni-freiburg.de
Summary
Large radiation doses, typical in radiosurgery, did not affect the function of Nucleus 24 k cochlear implants in cadaver testing. This suggests a low risk of cochlear implant failure when exposed to such radiation levels.
Area of Science:
- Medical physics
- Otorhinolaryngology
- Radiation oncology
Background:
- Cochlear implants (CIs) are crucial for hearing restoration.
- Radiosurgery involves high-dose radiation, raising concerns about electronic device integrity.
- Understanding CI response to radiation is vital for patient safety.
Purpose of the Study:
- To assess the functional impact of large single radiation doses on a Nucleus 24 k cochlear implant.
- To determine the safety of radiosurgery in patients with cochlear implants.
Main Methods:
- A Nucleus 24 k cochlear implant was placed in a cadaver head.
- The device was exposed to single fractions of 16.3 Gy, 6.2 Gy, and 20 Gy using 6 MV photons.
- Integrity tests (impedance, current output) were performed after each irradiation fraction.
Main Results:
- The cochlear implant maintained full function throughout the study.
- A total accumulated dose of 42.5 Gy did not alter impedance or current output.
- No functional changes were observed in the tested cochlear implant parameters.
Conclusions:
- Nucleus 24 k cochlear implants demonstrate resilience to high single doses of radiation.
- The risk of cochlear implant failure due to radiosurgery appears low.
- Further research can validate these findings for clinical application.