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Fast 31P chemical shift imaging using SSFP methods.

O Speck1, K Scheffler, J Hennig

  • 1Department of Diagnostic Radiology, Section Medical Physics, University Medical Center, Freiburg, Germany. ospeck@ukl.uni-freiburg.de

Magnetic Resonance in Medicine
|September 28, 2002
PubMed
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A new chemical shift imaging (CSI) technique using steady-state free precession (SSFP) enables fast, high-signal (31)P magnetic resonance imaging in human muscles. This method significantly improves signal-to-noise ratio for phosphocreatine (PCr) detection.

Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Phosphorus-31 Spectroscopy

Background:

  • Steady-state free precession (SSFP) offers high signal and rapid imaging, suitable for low-signal applications.
  • Chemical shift imaging (CSI) is crucial for metabolic analysis but often limited by acquisition time and signal-to-noise ratio (SNR).
  • Phosphorus-31 ((31)P) magnetic resonance spectroscopy (MRS) provides insights into cellular energy metabolism, particularly phosphocreatine (PCr) levels.

Purpose of the Study:

  • To implement and evaluate a novel CSI technique based on SSFP signal formation for (31)P imaging.
  • To assess the signal properties and performance of the SSFP CSI method in vivo.
  • To demonstrate fast, high-SNR (31)P CSI of human skeletal muscle at 2 Tesla.

Main Methods:

Related Experiment Videos

  • Development and application of a chemical shift imaging technique leveraging SSFP principles.
  • Evaluation of (31)P signal characteristics, including T(1) and T(2) dependencies.
  • In vivo data acquisition in human muscles at 2 Tesla using the novel SSFP CSI method.

    • Main Results:

    • The SSFP CSI method enables fast acquisition of (31)P spectra with high SNR.
    • The steady-state signal is dominated by phosphocreatine (PCr) due to T(1) and T(2) dependence.
    • An approximate 4-5 fold SNR gain for PCr was observed compared to a FLASH-based CSI method.
    • Subcentimeter resolution (31)P CSI of human muscle was achieved with high SNR.

    Conclusions:

    • The novel SSFP CSI technique provides a significant advancement for fast in vivo (31)P metabolic imaging.
    • This method offers superior SNR for phosphocreatine detection in human muscle compared to conventional techniques.
    • The technique holds promise for non-invasive assessment of muscle energetics and related pathologies.