1 / 15

Measurement of Temperature Distribution in Two-Dimensional NMR Imaging: Methods Comparison

This paper by Guo, Parker, and Roemer discusses various techniques for measuring temperature distribution using two-dimensional NMR imaging. It compares methods based on thermal coefficients, gyromagnetic ratios, and relevant corrections for field drift and susceptibility. The study evaluates the performance of different materials, including NaCl solutions, agar, boiled eggs, and chicken muscle, under varied conditions. It aims to improve calibration processes, enhance accuracy, and explore phase change issues in NMR thermometry, providing a comprehensive comparison of established methods.

abdul-peterson
Télécharger la présentation

Measurement of Temperature Distribution in Two-Dimensional NMR Imaging: Methods Comparison

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MR Temperature Measurement Jun-Yu Guo Dennis L. Parker Robert B. Roemer

  2. Temperature distribution measurements in two-dimensional NMR imaging Parker DL, Smith V, Sheldon P, Crooks LE, Fussell L. Med Phys (1983)

  3. Four Methods

  4. Comparison Table

  5. Gyromagnetic ratio Echo Time Phase change Thermal coefficient Magnetic field Temperature change PRF Theory

  6. PRF Calibration 1% NaCl Solution 0.0098 4% agar 0.0103 White of boiled egg 0.0091 Chicken Muscle 0.0114

  7. PRF Thermal Coefficient

  8. Phase change

  9. Problem • Field Drift • Susceptibility • Perfusion

  10. Drift Correction

  11. Screen constant Susceptibility constant Correction: • Suppression method • Modeling method Susceptibility

  12. Suppression method

  13. Thank You! Have a good Weekend!

More Related