Magnetite Particle Presence in the Human Brain: A Computational Dosimetric Study to Emphasize the Need of a Complete Assessment of the Electromagnetic Power Deposition at 3.5 GHz

2021 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 979

Study snapshot

Publicationmanual · 2021

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Magnetite Particle Presence in the Human Brain: A Computational Dosimetric Study to Emphasize the Need of a Complete Assessment of the Electromagnetic Power Deposition at 3.5 GHz D. Vatamanu, S. Miclaus. Magnetite Particle Presence in the Human Brain: A Computational Dosimetric Study to Emphasize the Need of a Complete Assessment of the Electromagnetic Power Deposition at 3.5 GHz. Eng. Technol. Appl. Sci. Res., 11(5): 7720–7729, Oct. 2021. Abstract The growing evidence of increased magnetite nanoparticles (both endo- and exo-genic) in the human brain raises the importance of assessing the entire power deposition when electromagnetic waves at GHz frequencies propagate in such tissues. This frequency range corresponds to many popular portable communication devices that emit radiation close to a human's head. At these frequencies, the current dosimetric numerical codes can not accurately compute the magnetic losses part. This is due to the lack of an implemented computational algorithm based on solving the coupled Maxwell and Landau-Lifshitz-Gilbert equations, in the case of magneto- dielectrics, considering eddy currents losses and specific properties of magnetic sub-millimetric particles. This paper focuses on analyzing the limits and the inconsistencies when using commercial dosimetric numerical software to analyze the total absorbed power in brain models having ferrimagnetic content and being exposed to 3.5GHz electromagnetic waves. Magnetic losses computed using Polder’s permeability tensor as constitutive relation lead to unreliable results. However, using such software can provide a preliminary view of the electromagnetic impact of ultra- and super-high frequencies on magnetic-dielectric tissues. Open access paper: etasr.com

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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 directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureRF · 3500 MHz

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: unknown

Main findings

The paper analyzes limits and inconsistencies of commercial dosimetric numerical software for estimating total absorbed power in brain models containing ferrimagnetic particles when exposed to 3.5 GHz fields. It reports that magnetic losses computed using Polder’s permeability tensor lead to unreliable results, while such software may still provide a preliminary view of electromagnetic impact at ultra-/super-high frequencies on magnetic-dielectric tissues.

Outcomes measured

computational dosimetry accuracy/limitations for total absorbed power in brain models with ferrimagnetic (magnetite) content at 3.5 GHz
assessment of magnetic losses modeling (Polder’s permeability tensor; need for coupled Maxwell and Landau-Lifshitz-Gilbert equations; eddy current losses)

Limitations

Computational/engineering focus; no biological or clinical outcomes reported in the abstract
States current dosimetric numerical codes cannot accurately compute magnetic losses at GHz frequencies in magneto-dielectrics without specific coupled-equation algorithms

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "portable communication devices (near head)",
    "frequency_mhz": 3500,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "computational dosimetry accuracy/limitations for total absorbed power in brain models with ferrimagnetic (magnetite) content at 3.5 GHz",
    "assessment of magnetic losses modeling (Polder’s permeability tensor; need for coupled Maxwell and Landau-Lifshitz-Gilbert equations; eddy current losses)"
  ],
  "main_findings": "The paper analyzes limits and inconsistencies of commercial dosimetric numerical software for estimating total absorbed power in brain models containing ferrimagnetic particles when exposed to 3.5 GHz fields. It reports that magnetic losses computed using Polder’s permeability tensor lead to unreliable results, while such software may still provide a preliminary view of electromagnetic impact at ultra-/super-high frequencies on magnetic-dielectric tissues.",
  "effect_direction": "unclear",
  "limitations": [
    "Computational/engineering focus; no biological or clinical outcomes reported in the abstract",
    "States current dosimetric numerical codes cannot accurately compute magnetic losses at GHz frequencies in magneto-dielectrics without specific coupled-equation algorithms"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "unknown",
  "keywords": [
    "magnetite nanoparticles",
    "human brain",
    "computational dosimetry",
    "power deposition",
    "magnetic losses",
    "Polder permeability tensor",
    "Maxwell equations",
    "Landau-Lifshitz-Gilbert",
    "eddy currents",
    "3.5 GHz",
    "GHz frequencies"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.55,
      "reason": "Focuses on 3.5 GHz exposure, a frequency band used for 5G, and discusses power deposition assessment."
    }
  ]
}

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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: Not supplied
PubMed: Not supplied

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