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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 straightness of the magnetic lines within the center (or, as it is technically known, the iso-center) of the magnet needs to be near-perfect. This is known as homogeneity. Fluctuations (inhomogeneities in the field strength) within the scan region should be less than three parts per million (3 ppm).he major components of an MRI scanner are: the main magnet, which polarizes the sample, the shim coils for correcting inhomogeneities in the main magnetic field, the gradient system which is used to localize the MR signal and the RF system, which excites the sample and detects the resulting NMR signal.