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MR Temperature Measurement

MR Temperature Measurement. Jun-Yu Guo Dennis L. Parker Robert B. Roemer. Temperature distribution measurements in two-dimensional NMR imaging. Parker DL, Smith V, Sheldon P, Crooks LE, Fussell L. Med Phys (1983). Four Methods. Comparison Table. Gyromagnetic ratio. Echo

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MR Temperature Measurement

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  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!

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