Determination of blood longitudinal relaxation time (T1) at high magnetic field strengths.

Magnetic resonance imaging · 2007 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3489

Using a circulation system under physiological conditions, bovine blood T1 increased linearly with magnetic field strength (B0) across 4.7, 7, and 9.4 T. The relationship was described as T1 = 129 ms/T * B0 + 1167 ms for magnetic field strengths between 1.5 a…

Study snapshot

PublicationMagnetic resonance imaging · 2007

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

In this study, a circulation system was used to measure T(1) values of bovine blood under physiological conditions at field strengths of 4.7, 7 and 9.4 T. Results show that T(1) increases linearly with magnetic field B(0) and can be described with the equation T(1)=129 ms/T B(0)+1167 ms for magnetic field strengths between 1.5 and 9.4 T.

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 typeother

Effect directionunclear

PopulationBovine blood (circulating system)

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Blood longitudinal relaxation time (T1)

Limitations

Sample size not reported in abstract
Study uses bovine blood in a circulation system; generalizability to humans not stated
No health outcomes assessed; outcome is a measurement parameter (T1)

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "MRI (static magnetic field B0)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Bovine blood (circulating system)",
  "sample_size": null,
  "outcomes": [
    "Blood longitudinal relaxation time (T1)"
  ],
  "main_findings": "Using a circulation system under physiological conditions, bovine blood T1 increased linearly with magnetic field strength (B0) across 4.7, 7, and 9.4 T. The relationship was described as T1 = 129 ms/T * B0 + 1167 ms for magnetic field strengths between 1.5 and 9.4 T.",
  "effect_direction": "unclear",
  "limitations": [
    "Sample size not reported in abstract",
    "Study uses bovine blood in a circulation system; generalizability to humans not stated",
    "No health outcomes assessed; outcome is a measurement parameter (T1)"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "MRI",
    "static magnetic field",
    "B0",
    "T1 relaxation time",
    "blood",
    "high field strength",
    "4.7 T",
    "7 T",
    "9.4 T"
  ],
  "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: 10.1016/j.mri.2006.10.020
PubMed: 17540286

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