Radiofrequency dosimetry in subjects implanted with metallic straight wires: a numerical study.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2008 · Mixed · Low evidence

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MixedLow evidencePaper 2840

Numerical modeling showed that thin metallic wires implanted in biological tissues significantly increase local SAR at 900 and 1800 MHz. Despite high SAR gradients, temperature rises remain low (around 1°C) under exposure below current safety limits.

Study snapshot

PublicationAnnual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2008

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

A numerical study to investigate the effects of the exposure to electromagnetic fields (EMF) at 900 and 1800 MHz on biological tissues implanted with thin metallic structures has been carried out, using the finite difference time domain (FDTD) solution technique. The results of the model show that the presence of a metallic wire yields to a significant increase in the local specific energy absorption rate (SAR). The present standards and/or guidelines on safe exposures of humans to EMF does not cover persons with implanted devices and thus the threshold levels to define safe exposure conditions might not apply in presence of high SAR gradients, such as the ones generated by thin metallic implanted objects. However, exposure to EMF fields below the actual safe levels even in presence of thin conductive structures cause rather low temperature rises (1 degrees C).

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 typein_vitro

Effect directionmixed

PopulationNot supplied

Sample sizeNot supplied

ExposureRF · 900 MHz

Evidence strengthLowConfidence: 50% · Peer reviewed: yes

Main findings

Outcomes measured

local specific energy absorption rate (SAR) increase
temperature rise in tissues

Limitations

Numerical study only, no in vivo or human data
Focus on thin metallic wires only
Temperature rise estimated, not measured directly

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 900,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "local specific energy absorption rate (SAR) increase",
    "temperature rise in tissues"
  ],
  "main_findings": "Numerical modeling showed that thin metallic wires implanted in biological tissues significantly increase local SAR at 900 and 1800 MHz. Despite high SAR gradients, temperature rises remain low (around 1°C) under exposure below current safety limits.",
  "effect_direction": "mixed",
  "limitations": [
    "Numerical study only, no in vivo or human data",
    "Focus on thin metallic wires only",
    "Temperature rise estimated, not measured directly"
  ],
  "evidence_strength": "low",
  "confidence": 0.5,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency",
    "dosimetry",
    "metallic implants",
    "specific absorption rate",
    "numerical modeling",
    "finite difference time domain"
  ],
  "suggested_hubs": []
}

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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: 10.1109/iembs.2008.4650183
PubMed: 19163686

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