MRI 2-LARMOR PRECESSION

#### Physics

MRI 2-LARMOR PRECESSION

1. In addition to energy separation of the parallel and antiparallel spin states, the protons also experience a torque in a perpendicular direction from the applied magnetic field that causes precession.

2. The precession occurs at an angular frequency (number of rotations/sec about an axis of rotation) that is proportional to the magnetic field strength B 0

3. The Larmor equation describes the dependence between the magnetic field B 0 , and the angular precessional frequency, $\LARGE&space;\omega&space;_{0}=\gamma&space;B_{0}$ (where γ = gyromagnetic ratio unique to each element).

##### 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