Simultaneous measurement of D and T2 using the distant dipolar field

Area of Science:

• Physics
• Chemistry
• Biophysics

Background:

• Long-range dipolar fields in liquids introduce non-linear terms in Bloch-Torrey equations.
• These non-linearities are crucial for understanding phenomena in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI).

Purpose of the Study:

• To present a novel method for simultaneously determining the diffusion coefficient (D) and spin-spin relaxation time (T2).
• To validate this method using a specific NMR sequence and experimental setup.

Main Methods:

• Utilizing a COSY Revamped by Z-asymmetric Echo Detection sequence.
• Applying an analytical first-order approximation solution of the modified Bloch-Torrey equations, incorporating distant dipolar field effects.
• Conducting experiments with doped water to demonstrate the technique.

Main Results:

• Successfully obtained simultaneous measurements of D and T2.
• The time evolution profile of the long-range dipolar field refocused signal was key to the measurements.

Conclusions:

• The developed technique provides a simultaneous measurement of diffusion coefficient and spin-spin relaxation time.
• This method offers a new approach for characterizing liquids using NMR, leveraging the effects of long-range dipolar fields.