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T1-T2* relaxation correlation measurements.

Razieh Enjilela1, Jiangfeng Guo1, Bryce MacMillan1

  • 1UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 21, 2021
PubMed
Summary
This summary is machine-generated.

The T1-T2* measurement offers a powerful alternative to T1-T2 analysis for materials with short T2 lifetimes. This technique distinguishes spin populations by T2* and T1, revealing material changes over time.

Keywords:
Free Induction DecayMagnetic Resonance ImagingMortarPorous MediaT(1) Saturation RecoveryT(1)-T(2)T(1)-T(2)* Measurement

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Low-field Magnetic Resonance (MR) analyses commonly use T2 lifetime measurements.
  • T1-T2 measurements are powerful for characterizing spin populations in porous and biopolymer materials.
  • T1-T2 measurements are challenging for materials with short T2 lifetimes, limiting their application.

Purpose of the Study:

  • To introduce and validate the T1-T2* measurement as an analog to T1-T2 analysis.
  • To demonstrate the utility of T1-T2* for materials with short T2 relaxation lifetimes.
  • To apply T1-T2* to characterize water populations in cement-based mortars and organic species.

Main Methods:

  • Development and application of the T1-T2* measurement technique.
  • Analysis of free induction decay signals governed by T2*.
  • Characterization of materials based on T1 and T2* relaxation times.

Main Results:

  • T1-T2* measurements successfully differentiate species based on T2* and T1 dimensions.
  • Mortar samples exhibit multi-modal T1-T2* behavior, indicating distinct water populations (interlayer and pore water).
  • Application to o-phenylenediamine shows Sinc Gaussian and exponential transverse magnetization decays.

Conclusions:

  • The T1-T2* measurement is a versatile technique applicable to materials with short T2 lifetimes.
  • This method can reveal time-dependent structural changes and identify solid-like species.
  • T1-T2* analysis provides insights into water dynamics within cementitious materials.