Automatic phasing of MR images. Part I: Linearly varying phase

In spin-echo and well shimmed gradient-echo images, the phase of the complex image often varies linearly in both the readout and phase-encode directions. Thus, in principle, it is possible to display an image in absorption mode. However, manually determining the two first-order and one zero-order ph...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2008-04, Vol.191 (2), p.184-192
Main Author: Larry Bretthorst, G.
Format: Article
Language:English
Subjects:
Absorption-mode images
Algorithms
Animals
Artificial Intelligence
Bayesian probability theory
Brain - anatomy & histology
Frequency estimation
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Linear Models
Magnetic Resonance Imaging - methods
Mice
Pattern Recognition, Automated - methods
Reproducibility of Results
Sensitivity and Specificity
Zero- and first-order phase estimation
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Summary:In spin-echo and well shimmed gradient-echo images, the phase of the complex image often varies linearly in both the readout and phase-encode directions. Thus, in principle, it is possible to display an image in absorption mode. However, manually determining the two first-order and one zero-order phase parameters needed to display an absorption-mode image is a formidable task. In this paper, the Bayesian calculations needed to automatically determine these parameters are presented, and the calculations are illustrated using spin-echo images.
ISSN:1090-7807
1096-0856
DOI:10.1016/j.jmr.2007.12.010