Abstract
In continuous wave (CW) electron paramagnetic resonance imaging (EPRI), high quality of reconstruction in a limited acquisition time is a high priority. It has been shown for the case of 3D EPRI, that a uniform distribution of the projection data generally enhances reconstruction quality. In this work, we have suggested two data acquisition techniques for which the gradient orientations are more evenly distributed over the 4D acquisition space as compared to the existing methods. The first sampling technique is based on equal solid angle partitioning of 4D space, while the second technique is based on Fekete points estimation in 4D to generate a more uniform distribution of data. After acquisition, filtered backprojection (FBP) is applied to carryout the reconstruction in a single stage. The single-stage reconstruction improves the spatial resolution by eliminating the necessity of data interpolation in multi-stage reconstructions. For the proposed data distributions, the simulations and experimental results indicate a higher fidelity to the true object configuration. Using the uniform distribution, we expect about 50% reduction in the acquisition time over the traditional method of equal linear angle acquisition.
Original language | English (US) |
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Pages (from-to) | 277-287 |
Number of pages | 11 |
Journal | Journal of Magnetic Resonance |
Volume | 187 |
Issue number | 2 |
DOIs | |
State | Published - Aug 2007 |
Externally published | Yes |
Keywords
- 4D inverse Radon transform
- EPRI
- Fekete points
- Reconstruction artifacts
- Single-stage reconstruction
ASJC Scopus subject areas
- Molecular Biology
- Physical and Theoretical Chemistry
- Spectroscopy
- Radiology Nuclear Medicine and imaging
- Condensed Matter Physics