RF Safe

Assessment of the specific absorption rate and calibration of decoupling parameters for proton decoupled carbon-13 MR spectroscopy at 3.0 T.

European journal of radiology · 2005 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3642

Two phantom experiments were performed to monitor temperature rise during (1H)-13C MRS and to systematically optimize decoupling bandwidth and power. The procedure’s reliability was discussed with reference to IEC SAR guidelines.

Study snapshot

PublicationEuropean journal of radiology · 2005
Study typeexposure_assessment
Reported directionUnclear
Evidence ratingInsufficient

Abstract

A strategy for proton decoupled carbon-13 MR spectroscopy ((1H)-13C MRS) with a strong static magnetic field (3.0 T) in vivo was investigated. The proton decoupling improves the signal-to-noise ratio, however, the effect of the decoupling power on the human body, especially in strong magnetic fields, should be considered. In order to establish a technique for monitoring the metabolism of glucose in the liver using (1H)-13C MRS at 3.0 T, two phantom experiments were performed. To assess whether the decoupling energy conformed to SAR limits defined by the IEC, temperature rises inside an agar gel phantom were monitored during a (1H)-13C MRS experiment. Then, the decoupling conditions of a glucose solution phantom were systematically optimized with combinations of decoupling bandwidth and power. The reliability of this procedure was discussed in conjunction with IEC guidelines.

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 typeexposure_assessment
Effect directionunclear
PopulationNot supplied
Sample sizeNot supplied
ExposureNot supplied
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Two phantom experiments were performed to monitor temperature rise during (1H)-13C MRS and to systematically optimize decoupling bandwidth and power. The procedure’s reliability was discussed with reference to IEC SAR guidelines.

Outcomes measured

  • Specific absorption rate (SAR) compliance with IEC limits (assessed via phantom temperature rise)
  • Temperature rise in agar gel phantom during (1H)-13C MRS
  • Optimization/calibration of proton decoupling parameters (bandwidth and power) in glucose solution phantom
  • Signal-to-noise ratio (SNR) improvement with proton decoupling (not quantified in abstract)

Limitations

  • Phantom experiments (agar gel and glucose solution) rather than in vivo measurements
  • No quantitative SAR values, temperature changes, or optimized parameter settings reported in the abstract
  • No human outcomes reported
View raw extracted JSON
{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": null,
    "source": "MRI (proton-decoupled carbon-13 MR spectroscopy at 3.0 T)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Specific absorption rate (SAR) compliance with IEC limits (assessed via phantom temperature rise)",
    "Temperature rise in agar gel phantom during (1H)-13C MRS",
    "Optimization/calibration of proton decoupling parameters (bandwidth and power) in glucose solution phantom",
    "Signal-to-noise ratio (SNR) improvement with proton decoupling (not quantified in abstract)"
  ],
  "main_findings": "Two phantom experiments were performed to monitor temperature rise during (1H)-13C MRS and to systematically optimize decoupling bandwidth and power. The procedure’s reliability was discussed with reference to IEC SAR guidelines.",
  "effect_direction": "unclear",
  "limitations": [
    "Phantom experiments (agar gel and glucose solution) rather than in vivo measurements",
    "No quantitative SAR values, temperature changes, or optimized parameter settings reported in the abstract",
    "No human outcomes reported"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "MRI",
    "3.0 T",
    "(1H)-13C MRS",
    "proton decoupling",
    "specific absorption rate",
    "SAR",
    "IEC guidelines",
    "phantom",
    "temperature rise",
    "calibration",
    "decoupling bandwidth",
    "decoupling power"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.25,
      "reason": "Discusses SAR limits and compliance with international-style safety guidelines (IEC) in an RF exposure context."
    }
  ]
}
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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: 10.1016/j.ejrad.2004.11.011
PubMed: 16036162

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