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Resolving estimation uncertainties of chemical shift encoded fat‐water imaging using magnetization transfer effect
| Content Provider | Scilit |
|---|---|
| Author | Samsonov, Alexey Liu, Fang Velikina, Julia V. |
| Copyright Year | 2019 |
| Description | Journal: Magnetic Resonance in Medicine B0 field inhomogeneity may cause significant errors in chemical shift encoding-based fat-water (F/W) separation. We describe a new approach to improve its robustness using novel B0 field map pre-estimation. Our method exploits insensitivity of fat to magnetization transfer effect, which allows generating fat-insensitive B0 field priors with full or partial spatial support using a low-resolution magnetization transfer-weighted scan. The full prior can be employed by most F/W separation methods for initialization or data demodulation. We also propose a modified region-growing algorithm in which the partial prior is utilized for its initial seeding. The magnetization transfer-based B0 priors significantly reduced F/W errors of three representative F/W separation methods in all cases. In cases with moderate B0 inhomogeneity, the full prior allowed error-free separation even with basic, voxel-independent processing. When coupled with methods exploiting B0 field smoothness, it significantly improved separation accuracy even in the presence of strong inhomogeneities. Seeding the region-growing with the partial prior significantly improved performance of F/W separation, including cases with spatially disconnected tissues. Magnetization transfer-based B0 field pre-estimation provides valuable prior information for F/W separation, which may significantly improve its robustness at the expense of nominal (< 5%-10%) scan time increase. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6491234/pdf |
| Ending Page | 212 |
| Page Count | 11 |
| Starting Page | 202 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.27709 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 1 |
| Volume Number | 82 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2019-03-07 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging Chemical Shift Imaging Dixon Fat-water Separation Magnetization Transfer |
| Content Type | Text |
| Resource Type | Article |
