shim coils

shim coils

An MRI term for coils positioned near the main magnetic field in an MR scanner which carry a relatively small current to provide localised auxiliary magnetic fields and field homogeneity.
Mentioned in ?
References in periodicals archive ?
In order to smooth the field, magnets have discrete superconducting shim coils within the helium dewar, the current in each of which can be individually adjusted when the magnet is first energized to maximize field homogeneity.