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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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Related Experiment Video

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Using Solution NMR to Characterize Biomolecular Condensates Under Biphasic Conditions
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Determining disk hydration status with a MnCl2-based MR model.

Andrew P Kurmis1, John P Slavotinek, Christine Barber

  • 1Bone and Joint Research Laboratory, IMVS/Hanson Institute in Adelaide, South Australia.

Radiologic Technology
|July 25, 2008
PubMed
Summary

A novel manganese chloride phantom demonstrates consistent magnetic resonance imaging signal homogeneity. This finding supports its potential use in accurately measuring intervertebral disc hydration status noninvasively.

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Area of Science:

  • Biomedical Engineering
  • Radiology
  • Spinal Imaging

Background:

  • Intervertebral disc (IVD) hydration status (HS) is crucial for spinal integrity.
  • Current in vivo IVD HS assessment methods are subjective and lack repeatability.
  • Objective and reliable methods for IVD HS quantification are needed.

Purpose of the Study:

  • To evaluate the signal homogeneity of a novel manganese chloride (MnCl2)-based phantom.
  • To assess the phantom's suitability for magnetic resonance (MR) imaging-based hydration status correlation.
  • To establish a consistent phantom for in vivo IVD HS measurement.

Main Methods:

  • Sixteen MnCl2 phantoms with varying concentrations were imaged using axial MR.
  • Signal-to-noise ratio and coefficient of variance were calculated for each concentration.
  • T1- and T2-weighted sequences were used to assess MR signal homogeneity.

Main Results:

  • Analysis of variance showed no significant difference in coefficient of variance for T1- (P = .13) or T2-weighted (P = .96) sequences.
  • This indicates a high degree of relative MR signal homogeneity across concentrations.
  • The MnCl2 phantom exhibited a predictable, concentration-related signal response.

Conclusions:

  • A MnCl2 phantom in a gelatin suspension provides a homogeneous and predictable MR signal.
  • This phantom material shows promise for developing a noninvasive model for human IVD HS quantification.
  • The developed phantom could improve the accuracy of in vivo spinal imaging assessments.