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Dual-Pathway sequences for MR thermometry: When and where to use them
| Content Provider | Scilit |
|---|---|
| Author | Ciris, Pelin Aksit Cheng, Cheng-Chieh Mei, Chang-Sheng Panych, Lawrence P. Madore, Bruno |
| Copyright Year | 2016 |
| Description | Journal: Magnetic Resonance in Medicine Dual-pathway sequences have been proposed to help improve the temperature-to-noise ratio (TNR) in MR thermometry. The present work establishes how much of an improvement these so-called "PSIF-FISP" sequences may bring in various organs and tissues. Simulations and TNR calculations were validated against analytical equations, phantom, abdomen, and brain scans. Relative TNRs for PSIF-FISP, as compared to a dual-FISP reference standard, were calculated for flip angle (FA) = 1 to 85 º and repetition time (TR) = 6 to 60 ms, for gray matter, white matter, cervix, endometrium, myometrium, prostate, kidney medulla and cortex, bone marrow, pancreas, spleen, muscle, and liver tissues. PSIF-FISP was TNR superior in the kidney, pelvis, spleen, or gray matter at most tested TR and FA settings, and benefits increased at shorter TRs. PSIF-FISP was TNR superior in other tissues, e.g., liver, muscle, pancreas, for only short TR settings (20 ms or less). The TNR benefits of PSIF-FISP increased slightly with FA, and strongly with decreasing TR. Up to two- to three-fold reductions in TR with 20% TNR gains were achievable. In any given tissue, TNR performance is expected to further improve with heating, due to changes in relaxation rates. Dual-pathway PSIF-FISP can improve TNR and acquisition speed over standard gradient-recalled echo sequences, but optimal acquisition parameters are tissue dependent. Magn Reson Med 77:1193-1200, 2017. © 2016 International Society for Magnetic Resonance in Medicine. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5018245/pdf |
| Ending Page | 1200 |
| Page Count | 8 |
| Starting Page | 1193 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.26177 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 3 |
| Volume Number | 77 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2016-03-10 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging Mr Thermometry Multipathway Sequences Proton Resonance Frequency Shift Temperature-to-noise Ratio |
| Content Type | Text |
| Resource Type | Article |
