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Microscopic displacement imaging with pulsed field gradient turbo spin-echo NMR
T W Scheenen1, D van Dusschoten, P A de Jager
1Laboratory of Molecular Physics, Department of Biomolecular Sciences, Wageningen University, Dreijenlaan 3, HA Wageningen, 6703, The Netherlands.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 29, 2000
Summary
This study introduces a new pulse sequence combining pulsed field gradient (PFG) NMR and turbo spin-echo (TSE) imaging for precise spin displacement measurements. The method generates accurate displacement propagators in biological systems efficiently.
Area of Science:
- Magnetic Resonance Imaging
- Biophysics
- Plant Science
Background:
- Accurate measurement of spin displacement is crucial for understanding molecular motion in biological systems.
- Existing methods often lack spatial resolution or are time-consuming.
Purpose of the Study:
- To develop a novel pulse sequence for accurate, spatially resolved measurement of spin displacements.
- To enable efficient data acquisition for displacement mapping in biological samples.
Main Methods:
- Combination of pulsed field gradient (PFG) Nuclear Magnetic Resonance (NMR) with turbo spin-echo (TSE) imaging.
- Ensuring constant echo phase within the spin-echo train to generate pixel-by-pixel displacement propagators.
- Utilizing separate phase encoding for each echo in a TSE train to reduce imaging time.
Main Results:
- Demonstrated capability to measure complete and accurate displacement propagators.
- Achieved high-resolution imaging (128 x 128 pixels) with detailed spatial information (117 x 117 x 3,000 microm).
- Acquired data for 16 PFG steps per pixel within a 17-minute scan time on phantoms and a tomato plant stem.
Conclusions:
- The developed pulse sequence allows for precise, spatially resolved spin displacement measurements in biological systems.
- This technique significantly reduces imaging time, making dynamic displacement studies feasible at physiologically relevant timescales for plants.