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MRI-FACTORS AFFECTING T2 RELAXATION

Physics

MRI-FACTORS AFFECTING T2 RELAXATION

1. Dephasing is caused by inhomogeneities in the external magnetic field (B 0 ), local magnetic fields in the surrounding tissue.
2. The shorter the T2, the more inhomogeneous the local magnetic field is.

CAUSES
3. Liquids - the molecules (and magnetic fields) within liquids move relatively quickly. The magnetic fields “average out” to give a relatively homogeneous magnetic field. Protons, therefore, stay in phase for longer. T2 is long.
4. Impure liquids - large molecules move relatively slowly, hence the local magnetic field is more inhomogeneous & protons dephase quicker. T2 is short.


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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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