Systems, methods and apparatus are provided through which heat produced in
the patient examination space by the power used to create electromagnetic
fields in an MRI/MRS system is significantly reduced by coolant carried
by one of two split connected concentric coil layers of one of two of the
primary gradient coils used to alter the main magnetic field. The coil
carrying the coolant is made of copper tubing. The second primary
gradient coil is placed between the layers of the split primary gradient
coil. Adjusting the number of turns in each layer of the split primary
gradient coil adjusts the heat generated. The inductances and resistances
of the two primary gradient coils are balanced by adjusting the gain of
the coils.