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Fast 19F-NMR imaging in vivo using FLASH-MRI
Magnetic Resonance Imaging
|January 1, 1994
Summary
This study developed a rapid chemical shift selective 19F NMR imaging method. The technique significantly shortens acquisition time for pharmacological studies of perfluorooctylbromide (PFOB) clearance in rat organs.
Area of Science:
- Magnetic Resonance Imaging
- Pharmacology
- Biomedical Engineering
Background:
- Chemical shift selective imaging is crucial for targeted molecular detection.
- Short acquisition times are needed for dynamic physiological processes.
- Fluorine-19 (19F) NMR offers unique sensitivity for specific tracers.
Purpose of the Study:
- To develop a fast method for acquiring chemical shift selective 19F NMR images.
- To enable rapid imaging for pharmacological studies.
- To reduce data acquisition time significantly.
Main Methods:
- Utilized a presaturation experiment with frequency selective pulses and random dephasing gradients.
- Employed a SNAPSHOT-FLASH imaging sequence post-presaturation.
- Achieved a 64 x 128 image acquisition time of 470 ms at 4.7 Tesla.
Main Results:
- Successfully suppressed unwanted chemical shift components.
- Demonstrated a rapid imaging method for 19F NMR.
- Acquisition time was reduced to under half a second for detailed images.
Conclusions:
- The developed method allows for rapid chemical shift selective 19F NMR imaging.
- This technique is suitable for longitudinal pharmacological studies, such as PFOB clearance.
- The speed and selectivity offer advancements in in vivo molecular imaging.