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FOPE zones were identified on routine MRI ex-. aminations of the knee performed for acute or chron -. ic pain in 12 patients (seven girls and five boys; age. range, 11 years 9 monthsâ15 years 8 months); the MR. examinations were collected over 5 years (March. 2005âFebruary 2010). Patient history was obtained.
The xy component of the net magnetization vector at right angles to the main magnetic field. The precession of the transverse magnetization at the Larmor frequency is responsible for the detectable MRI signal. In the absence of externally applied RF energy, the transverse magnetization will decay to zero with a characteristic time constant of T2, or more strictly T2* .