Loading...
Please wait, while we are loading the content...
Similar Documents
Accurate MR thermometry by hyperpolarized$ ^{129}$ Xe
| Content Provider | Scilit |
|---|---|
| Author | Zhang, Le Burant, Alex McCallister, Andrew Zhao, Victor Koshlap, Karl M. Degan, Simone Antonacci, Michael Branca, Rosa Tamara |
| Copyright Year | 2016 |
| Description | Journal: Magnetic Resonance in Medicine To investigate the temperature dependence of the resonance frequency of lipid-dissolved xenon (LDX) and to assess the accuracy of LDX-based MR thermometry. The chemical shift temperature dependence of water protons, methylene protons, and LDX was measured from samples containing tissues with varying fat contents using a high-resolution NMR spectrometer. LDX results were then used to acquire relative and absolute temperature maps in vivo and the results were compared with PRF-based MR thermometry. The temperature dependence of proton resonance frequency (PRF) is strongly affected by the specific distribution of water and fat. A redistribution of water and fat compartments can reduce the apparent temperature dependence of the water chemical shift from -0.01 ppm/°C to -0.006 ppm, whereas the LDX chemical shift shows a consistent temperature dependence of -0.21 ppm/°C. The use of the methylene protons resonance frequency as internal reference improves the accuracy of LDX-based MR thermometry, but degrades that of PRF-based MR thermometry, as microscopic susceptibility gradients affected lipid and water spins differently. The LDX resonance frequency, with its higher temperature dependence, provides more accurate and precise temperature measurements, both in vitro and in vivo. More importantly, the resonance frequency of nearby methylene protons can be used to extract absolute temperature information. Magn Reson Med 78:1070-1079, 2017. © 2016 International Society for Magnetic Resonance in Medicine. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5757877/pdf |
| Ending Page | 1079 |
| Page Count | 10 |
| Starting Page | 1070 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.26506 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 3 |
| Volume Number | 78 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2016-10-19 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging Mr Thermometry Adipose Tissue Proton Resonance Frequency Shift |
| Content Type | Text |
| Resource Type | Article |
