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MRI-FACTORS AFFECTING T1 RELAXATION

Physics

MRI-FACTORS AFFECTING T1 RELAXATION

1. T1 depends on the surrounding tissue composition and structure.
2. The shorter the T1, the quicker the protons exchange thermal energy with the lattice.

FACTORS
3. Liquids have a long T1 - difficult to transfer thermal energy as the surrounding molecules are moving too rapidly.
4. Fat has a short T1 - the carbon bonds at the ends of fatty acids have frequencies near the Larmor frequency, thus energy transfer is easier.
5. T1 increases as the strength of the external magnetic field (B 0 ) increases - the protons precess faster (Larmor frequency increases) and are less efficient at transferring energy to the slower moving lattice.


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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