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Related Experiment Videos

Cochlear implants: response to therapeutic irradiation.

A Ralston1, G Stevens, E Mahomudally

  • 1Department of Radiation Oncology, Royal Prince Alfred Hospital, Sydney, Australia. aralston@radonc.rpa.cs.nsw.gov.au

International Journal of Radiation Oncology, Biology, Physics
|April 29, 1999
PubMed
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Cochlear implants (bionic ears) showed minimal functional changes after therapeutic irradiation up to 150 Gy. Reprogramming the speech map can compensate for any stimulator output current alterations, indicating a low risk of implant failure during cranial radiation therapy.

Area of Science:

  • Medical Physics
  • Otolaryngology
  • Radiation Oncology

Background:

  • Cochlear implants, or bionic ears, are crucial for hearing restoration.
  • The impact of therapeutic irradiation on cochlear implant functionality was previously unknown.
  • This study investigated the response of specific cochlear implant models to varying doses of X-ray irradiation.

Observation:

  • Cochlear implant models (CI22M and CI24M) were subjected to controlled doses of 4 MV X-rays, reaching a cumulative dose of 150 Gy.
  • Functional parameters including RF link range and stimulator output current were monitored.
  • The radiation shielding effect of the implants was also quantified.

Findings:

  • CI22M units exhibited changes in stimulator output current at doses above 50 Gy, with RF link range degradation at higher doses.

Related Experiment Videos

  • CI24M units showed output current changes at 100 Gy and significant alterations at 150 Gy.
  • A 6% dose attenuation was observed for ipsilateral single-field 4 MV X-rays.

    • Implications:

    • Cochlear implant patients can likely undergo cranial irradiation with a low risk of device failure.
    • Post-irradiation, adjustments to the speech map can effectively manage changes in stimulator output current.
    • These findings provide crucial data for radiation oncology planning in patients with cochlear implants.