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Difference from Background: Limit of Detection

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Real-Time Metabolic Detection in Living Cells Using Hyperpolarized 13C NMR
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Optimized detection of lactate at high fields using inner volume saturation.

Richard A E Edden1, Michael Schär, Argye E Hillis

  • 1Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA. pbarker2@jhmi.edu

Magnetic Resonance in Medicine
|September 12, 2006
PubMed
Summary

Inner Volume Saturation (IVS) improves lactate detection in proton magnetic resonance spectroscopy (¹H-MRS) by inverting unwanted signals. This method enhances lactate signal recovery, especially at high magnetic field strengths.

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Neuroimaging

Background:

  • Proton magnetic resonance spectroscopy (¹H-MRS) detects metabolites like lactate (Lac).
  • Lactate detection is challenged by homonuclear scalar couplings (J) and chemical shift effects at high fields (≥3T).
  • These effects complicate signal modulation, potentially leading to signal loss and misidentification with lipids.

Purpose of the Study:

  • To introduce and validate Inner Volume Saturation (IVS) for improved lactate detection in ¹H-MRS.
  • To overcome signal modulation complexities at high magnetic field strengths.
  • To enhance the accuracy of lactate quantification in vivo.

Main Methods:

  • Theoretical description of Inner Volume Saturation (IVS).
  • Application of high bandwidth spatial pulses to selectively saturate unwanted signal regions.
  • Experimental validation at 3 Tesla using a phantom and an acute stroke patient.

Main Results:

  • IVS effectively removes signal contributions causing unwanted lactate modulation patterns.
  • Phantom measurements demonstrated virtually 100% lactate signal recovery.
  • Successful experimental demonstration in a phantom and a patient with acute stroke.

Conclusions:

  • Inner Volume Saturation (IVS) is a novel and effective method for improving lactate detection in ¹H-MRS.
  • The technique shows promise for accurate lactate quantification at 3 Tesla and above.
  • IVS may be applicable to other coupled spin systems affected by modulation effects.