Magnetic field mapping by selective equipotential excitation.

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference · 2006 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3463

The study presents a magnetic field mapping method for MRI using selective excitation of magnetic equipotentials and a ferromagnetic ball to create a perturbation. Preliminary investigations indicate the method is accurate and yields field maps without distor…

Study snapshot

PublicationConference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference · 2006

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

A new magnetic field mapping method in MRI is presented. This technique is ideal for severe inhomogeneities where plane warp cannot be ignored. The present study employs a ferromagnetic ball to create a perturbation within the imaged volume. The magnetic moment and position of the device are acquired experimentally with a new technique that excites magnetic equipotentials within a volume. A three dimensional perturbation field is then reconstructed from which an accurate field map is acquired for any slice within the volume. This method is compared with phase imaging, which is commonly used to map the magnetic field perturbation. Preliminary investigations show that this method is accurate and provides field maps that do not suffer from distortion in the slice select and read direction. This method can help in the correction of susceptibility artifacts by providing an accurate map of the perturbing field generated by magnetic markers on medical instruments.

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

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Magnetic field mapping accuracy in MRI
Distortion in slice select and read directions
Correction of susceptibility artifacts
Reconstruction of 3D perturbation field from magnetic markers/ferromagnetic ball

Limitations

Only preliminary investigations are reported
No quantitative performance metrics or sample size are provided in the abstract

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "MRI",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Magnetic field mapping accuracy in MRI",
    "Distortion in slice select and read directions",
    "Correction of susceptibility artifacts",
    "Reconstruction of 3D perturbation field from magnetic markers/ferromagnetic ball"
  ],
  "main_findings": "The study presents a magnetic field mapping method for MRI using selective excitation of magnetic equipotentials and a ferromagnetic ball to create a perturbation. Preliminary investigations indicate the method is accurate and yields field maps without distortion in the slice select and read directions, and it is compared against phase imaging.",
  "effect_direction": "unclear",
  "limitations": [
    "Only preliminary investigations are reported",
    "No quantitative performance metrics or sample size are provided in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "MRI",
    "magnetic field mapping",
    "equipotential excitation",
    "ferromagnetic ball",
    "phase imaging",
    "susceptibility artifacts",
    "magnetic markers",
    "medical instruments"
  ],
  "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.2006.260054
PubMed: 17946581

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