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Multidimensional imaging using combined stray field and pulsed gradients
J Godward1, E Ciampi, M Cifelli
1Department of Physics, School of Physics and Chemistry, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 12, 2002
Summary
Stray field imaging (STRAFI) now creates 2D and 3D images without sample rotation. This advance uses magnetic field gradients, enabling new applications in material science and improved radiofrequency pulse calibration.
Area of Science:
- Magnetic Resonance Imaging
- Materials Science
- Spectroscopy
Background:
- Stray Field Imaging (STRAFI) traditionally requires sample rotation for imaging.
- Superconducting magnets generate static stray magnetic fields utilized in STRAFI.
Purpose of the Study:
- To develop a novel STRAFI method for imaging planar samples without sample rotation.
- To introduce diffusion-weighted imaging extensions and explore new applications.
- To present a new method for radiofrequency pulse width calibration in stray fields.
Main Methods:
- Utilizing the static stray magnetic field gradient combined with pulsed orthogonal gradients.
- Implementing both two- and three-dimensional imaging experiments.
- Developing diffusion-weighted imaging sequences compatible with the new STRAFI approach.
Main Results:
- Successful acquisition of planar sample images without sample rotation.
- Demonstration of two- and three-dimensional STRAFI capabilities.
- Introduction and validation of an extended diffusion-weighted imaging technique.
- Discovery of a novel method for radiofrequency pulse width calibration.
Conclusions:
- The developed STRAFI technique eliminates the need for sample rotation, simplifying imaging procedures.
- This advancement is particularly beneficial for anisotropic samples and processes like drying and curing.
- The new method offers improved radiofrequency pulse calibration accuracy in stray field environments.