Reconstructing powder NQR images with real gradient coils

Area of Science:

• Physics
• Materials Science
• Imaging Techniques

Background:

• Nuclear Magnetic Resonance (NMR) imaging simplifies gradient considerations to components along the main field.
• Nuclear Quadrupole Resonance (NQR) imaging of powders necessitates accounting for all non-zero magnetic field gradient components.
• Physically realizable gradient coils inherently possess multiple non-zero gradient components of comparable magnitude.

Purpose of the Study:

• To develop a practical NQR imaging reconstruction technique for powder or polycrystalline materials.
• To address the complexities of image reconstruction arising from multiple significant gradient components in NQR imaging.
• To demonstrate a novel approach for NQR imaging using physically realizable gradients.

Main Methods:

• Adaptation of standard imaging reconstruction techniques.
• Implementation of a nonrectilinear grid tailored for NQR imaging.
• Utilizing physically realizable gradient coils with multiple non-zero components.
• Acquisition of 35Cl NQR signal from a polycrystalline NaClO3 sample.

Main Results:

• Demonstration of a practical NQR imaging reconstruction technique.
• Successful construction of a two-dimensional image using NQR signals.
• Validation of the nonrectilinear grid approach for complex gradient fields.
• Presentation of a 2D image from polycrystalline NaClO3.

Conclusions:

• The developed NQR imaging reconstruction technique is effective for polycrystalline materials.
• The nonrectilinear grid method provides a viable solution for NQR imaging with complex gradients.
• This work facilitates more straightforward NQR image reconstruction compared to previous methods.