AI Article Synopsis
- The study aims to improve image quality in projection reconstruction (PR) by altering its k-space trajectory to focus more on mid-frequencies while decreasing coverage of outer frequencies.
- The method involved modifying the standard single k-space spoke in the PR to include one complete and two partial spokes per repetition, leading to reduced overall k-space extent.
- Results showed that the modified PR technique led to fewer undersampling artifacts, although it did reduce spatial resolution somewhat, and this was confirmed through both phantom and real in vivo imaging tests.
Article Abstract
Purpose: To reduce undersampling artifacts for a given number of repetitions of the projection reconstruction (PR) sequence by modifying its k-space trajectory to sample more mid-frequencies while reducing the sampling coverage of the peripheral spatial frequencies.
Materials And Methods: The single k-space spoke measured per repetition in the standard PR was modified so that one complete and two partial spokes were measured per repetition but with decreased k-space extent. The point spread functions (PSFs) and undersampling artifacts of the modified PR were compared with those of the standard PR for various numbers of projections. Phantom and in vivo images were used to assess the relative performance.
Results: PSF analysis indicated that the modified PR method provided reduced undersampling artifacts with somewhat reduced spatial resolution. The phantom and in vivo images corroborated this.
Conclusion: The modified PR trajectory provides reduced undersampling artifact vs. the standard PR, particularly when the number of projections is limited and the artifact level is high.
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| http://dx.doi.org/10.1002/jmri.20248 | DOI Listing |
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