Assessment of SAR in the tissues near a cochlear implant exposed to radiofrequency electromagnetic fields.

Physics in medicine and biology · 2009 · Mixed · Low evidence

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MixedLow evidencePaper 4964

In simulations of a head model exposed to a uniform plane wave at 900, 1750 and 1950 MHz, the presence of a cochlear implant produced negligible variations in averaged SAR values in the head and cochlear tissues. Very localized differences in point SAR were o…

Study snapshot

PublicationPhysics in medicine and biology · 2009

Study typeengineering

Reported directionMixed

Evidence ratingLow

Abstract

Cochlear implants (CI) are electronic devices used to restore partial hearing to people with severe hearing impairment. This paper aims to investigate if the introduction of a CI has an effect on SAR distribution in a head model exposed to radiofrequency electromagnetic fields (RF EMF) at mobile communication frequencies. The head model was obtained by image segmentation, the implant was modelled as a geometric structure and the exposure source was modelled as a uniform plane wave at 900 MHz, 1750 MHz and 1950 MHz, incident on the side of the head with the CI. Vertical and horizontal polarizations were simulated. Results show that the presence of a CI inside the cochlea produces negligible variations in the averaged SAR values, both in the head and in the cochlear tissues, although very localized differences in point SAR were found in the cochlea. Globally, these results suggest that finding harmful effects in the cochlear tissues will be unlikely.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionmixed

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

SAR distribution in head model
Averaged SAR in head tissues
Averaged SAR in cochlear tissues
Point SAR differences in cochlea

Limitations

Modeling/simulation study (head model and geometric implant model) rather than measurements in humans
Exposure modeled as a uniform plane wave; may not represent real-world mobile phone exposure conditions
Only specific frequencies (900, 1750, 1950 MHz) and incident direction (on CI side) and polarizations were simulated

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "SAR distribution in head model",
    "Averaged SAR in head tissues",
    "Averaged SAR in cochlear tissues",
    "Point SAR differences in cochlea"
  ],
  "main_findings": "In simulations of a head model exposed to a uniform plane wave at 900, 1750 and 1950 MHz, the presence of a cochlear implant produced negligible variations in averaged SAR values in the head and cochlear tissues. Very localized differences in point SAR were observed in the cochlea.",
  "effect_direction": "mixed",
  "limitations": [
    "Modeling/simulation study (head model and geometric implant model) rather than measurements in humans",
    "Exposure modeled as a uniform plane wave; may not represent real-world mobile phone exposure conditions",
    "Only specific frequencies (900, 1750, 1950 MHz) and incident direction (on CI side) and polarizations were simulated"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "cochlear implant",
    "SAR",
    "head model",
    "radiofrequency electromagnetic fields",
    "mobile communication frequencies",
    "900 MHz",
    "1750 MHz",
    "1950 MHz",
    "plane wave",
    "polarization"
  ],
  "suggested_hubs": [
    {
      "slug": "medical-implants",
      "weight": 0.9,
      "reason": "Assesses SAR distribution near a cochlear implant under RF exposure."
    },
    {
      "slug": "rf-dosimetry",
      "weight": 0.85,
      "reason": "Simulation-based assessment of SAR distribution in tissues at mobile communication frequencies."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1088/0031-9155/54/8/n03
PubMed: 19321926

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