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Multi-photon Intracellular Sodium Imaging Combined with UV-mediated Focal Uncaging of Glutamate in CA1 Pyramidal Neurons
Published on: October 8, 2014
Selective detection of ordered sodium signals by a jump-and-return pulse sequence
Jae-Seung Lee1, Ravinder R Regatte, Alexej Jerschow
1Department of Chemistry, New York University, New York, NY 10003, USA.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 15, 2009
Summary
A new quadrupolar jump-and-return (QJR) sequence selectively detects ordered sodium based on its quadrupolar coupling. This method demonstrates feasibility for modifying contrast in sodium imaging applications.
Area of Science:
- Magnetic Resonance Imaging
- Nuclear Magnetic Resonance Spectroscopy
- Biophysics
Background:
- Ordered sodium detection is crucial for understanding biological systems.
- Quadrupolar coupling significantly influences sodium NMR signals.
- Selective detection methods are needed to enhance contrast and specificity.
Purpose of the Study:
- To introduce and validate a simple pulse sequence for selective sodium detection.
- To demonstrate contrast modification based on quadrupolar coupling.
- To assess the feasibility of the sequence in phantom studies.
Main Methods:
- Derivation of a pulse sequence from an optimally shaped pulse for spin 3/2 central transitions.
- Implementation of a quadrupolar jump-and-return (QJR) sequence with two opposite-phase pulses and a delay.
- Testing the QJR sequence using phantoms containing sodium ions in bacteriophage and aqueous solutions.
Main Results:
- The QJR sequence successfully achieved selective detection of ordered sodium.
- Demonstrated contrast modification capabilities by exploiting differences in quadrupolar coupling.
- Validated the sequence's performance in both bacteriophage and aqueous sodium ion phantoms.
Conclusions:
- The developed QJR sequence offers a simple and effective method for selective sodium detection.
- This technique allows for contrast manipulation in sodium NMR imaging by targeting specific quadrupolar couplings.
- The findings support the potential application of QJR sequences in various fields requiring sensitive sodium analysis.
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