RF Safe

Averaged head phantoms from magnetic resonance images of Korean children and young adults

2017 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 2180

The study constructed averaged head phantoms for Korean children and young adults using MRI-based averaging (29 averaged items) from 500 individuals, revising initial template phantoms. Reported anatomical trends included female brain size and cranium thickne…

Study snapshot

Publicationmanual · 2017
Study typeengineering
Reported directionUnclear
Evidence ratingInsufficient

Abstract

Averaged head phantoms from magnetic resonance images of Korean children and young adults Han M, Lee AK, Choi HD, Jung YW, Park JS. Averaged head phantoms from magnetic resonance images of Korean children and young adults. Phys Med Biol. 2017 Dec 14. doi: 10.1088/1361-6560/aaa1c7. Abstract Increased use of mobile phones raises concerns about the health risks of electromagnetic radiation. Phantom heads are routinely used for radiofrequency dosimetry simulations, and the purpose of this study was to construct averaged phantom heads for children and young adults. Using magnetic resonance images (MRI), sectioned cadaver images, and a hybrid approach, we initially built template phantoms representing 6-, 9-, 12-, 15-year-old children and adult. Our subsequent approach revised the template phantoms using 29 averaged items that were identified by averaging the MRI data from 500 children and young adults. In females, the brain size and cranium thickness peaked in the early teens and then decreased. This is contrary to what was observed in males, where brain size and cranium thicknesses either plateaued or grew continuously. The overall shape of brains was spherical in children and became ellipsoidal by adulthood. In this study, we devised a method to build averaged phantom heads by constructing surface and voxel models. The surface model could be used for phantom manipulation, whereas the voxel model could be used for compliance test of specific absorption rate (SAR) for users of mobile phones or other electronic devices. ncbi.nlm.nih.gov

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 directionunclear
PopulationKorean children and young adults (template phantoms for 6-, 9-, 12-, 15-year-olds and adults)
Sample size500
ExposureRF
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

The study constructed averaged head phantoms for Korean children and young adults using MRI-based averaging (29 averaged items) from 500 individuals, revising initial template phantoms. Reported anatomical trends included female brain size and cranium thickness peaking in early teens then decreasing, while in males these measures plateaued or continued to grow; brain shape was more spherical in children and became ellipsoidal by adulthood. The resulting surface and voxel models were proposed for phantom manipulation and SAR compliance testing, respectively.

Outcomes measured

  • Development of averaged head phantom models (surface and voxel) from MRI and other imaging sources
  • Anatomical characteristics relevant to RF dosimetry (e.g., brain size, cranium thickness, brain shape)
  • Intended application for SAR compliance testing for mobile phones/other electronic devices
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Korean children and young adults (template phantoms for 6-, 9-, 12-, 15-year-olds and adults)",
  "sample_size": 500,
  "outcomes": [
    "Development of averaged head phantom models (surface and voxel) from MRI and other imaging sources",
    "Anatomical characteristics relevant to RF dosimetry (e.g., brain size, cranium thickness, brain shape)",
    "Intended application for SAR compliance testing for mobile phones/other electronic devices"
  ],
  "main_findings": "The study constructed averaged head phantoms for Korean children and young adults using MRI-based averaging (29 averaged items) from 500 individuals, revising initial template phantoms. Reported anatomical trends included female brain size and cranium thickness peaking in early teens then decreasing, while in males these measures plateaued or continued to grow; brain shape was more spherical in children and became ellipsoidal by adulthood. The resulting surface and voxel models were proposed for phantom manipulation and SAR compliance testing, respectively.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "phantom head",
    "MRI",
    "Korean children",
    "young adults",
    "radiofrequency dosimetry",
    "specific absorption rate",
    "SAR compliance",
    "mobile phones",
    "voxel model",
    "surface model"
  ],
  "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: 10.1088/1361-6560/aaa1c7
PubMed: Not supplied

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