Numerical evaluation of radio frequency power deposition in human models during MRI.

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "MRI",
    "frequency_mhz": 64,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Pregnant mothers (27-week fetus model) and cardiac pacemaker bearers (human torso model with in situ pacemaker and leads)",
  "sample_size": null,
  "outcomes": [
    "Numerical evaluation of RF power deposition",
    "Organ dosimetry",
    "Excessive heating concern (context)"
  ],
  "main_findings": "Numerical simulations evaluated RF power deposition for a 27-week fetus in a simplified maternal model and for a realistic human torso model with an in situ pacemaker and leads, with additional organ dosimetry for a realistic torso model. Simulations assessed an ideal non-resonant and two resonant birdcage coils operating at 64 MHz (1.5 T MRI) using the FDTD method.",
  "effect_direction": "unclear",
  "limitations": [
    "No quantitative results (e.g., SAR, temperature rise) reported in the abstract",
    "Model-based numerical evaluation; real-world exposure conditions and validation not described in the abstract",
    "Sample size not applicable/unspecified"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "MRI",
    "radio frequency",
    "power deposition",
    "heating",
    "pregnancy",
    "fetus",
    "pacemaker",
    "birdcage coil",
    "64 MHz",
    "1.5 T",
    "FDTD",
    "organ dosimetry"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.2,
      "reason": "MRI-related RF exposure assessment may be relevant to clinical/technical settings, but the abstract focuses on patients rather than workers."
    }
  ]
}