Concept of Phase Cycling in Pulsed Magnetic Resonance Using Sinusoidal Magnetic Field Modulation.

Zeitschrift fur physikalische Chemie (Frankfurt am Main, Germany) · 2017 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 2861

Study snapshot

PublicationZeitschrift fur physikalische Chemie (Frankfurt am Main, Germany) · 2017

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

In conventional pulsed magnetic resonance suppression of unwanted signals is achieved by changing pulse phases with respect to the reference signal and spin magnetization phase. This method is called phase cycling. An alternative approach is suggested to separate the unwanted signals from the spin echo by using magnetic field modulation. Precession frequency of the spins, and therefore phases of free indication decays and echo signals, can be controlled by the selection of modulation parameters. This enables phase cycling. Since the signal is detected in the presence of the changing magnetic field, which drives spin precession, the echo signal is frequency-modulated. Numerical transformation into an accelerating reference frame associated with the Larmor frequency restores the signal to a form that would have been observed in the absence of modulation. The suggested phase cycling method is analyzed in detail for the two pulse spin echo case.

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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

The paper proposes an alternative to conventional phase cycling in pulsed magnetic resonance by using sinusoidal magnetic field modulation to control spin precession phases and separate unwanted signals from the spin echo. It describes that modulation frequency-modulates the echo signal and that a numerical transformation into an accelerating reference frame associated with the Larmor frequency can restore the signal form as if observed without modulation; the approach is analyzed for a two-pulse spin echo case.

Outcomes measured

suppression of unwanted signals in pulsed magnetic resonance
phase cycling using sinusoidal magnetic field modulation
spin echo signal separation/restoration via numerical transformation to an accelerating reference frame

View raw extracted JSON

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  "outcomes": [
    "suppression of unwanted signals in pulsed magnetic resonance",
    "phase cycling using sinusoidal magnetic field modulation",
    "spin echo signal separation/restoration via numerical transformation to an accelerating reference frame"
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  "main_findings": "The paper proposes an alternative to conventional phase cycling in pulsed magnetic resonance by using sinusoidal magnetic field modulation to control spin precession phases and separate unwanted signals from the spin echo. It describes that modulation frequency-modulates the echo signal and that a numerical transformation into an accelerating reference frame associated with the Larmor frequency can restore the signal form as if observed without modulation; the approach is analyzed for a two-pulse spin echo case.",
  "effect_direction": "unclear",
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  "peer_reviewed_likely": "yes",
  "keywords": [
    "pulsed magnetic resonance",
    "phase cycling",
    "spin echo",
    "sinusoidal magnetic field modulation",
    "Larmor frequency",
    "frequency modulation",
    "numerical transformation"
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  "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: 10.1515/zpch-2016-0843
PubMed: 28751814

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