DESCRIPTION OF THE DRAWINGS
FIGS. 1A-1D show a typical gradient coil layout and illustrate the location of a receiving channel therein for discrete shim units of the invention, for an open-magnet magnetic resonance imaging (MRI) system.
FIG. 2 shows, in simplified and block diagrammatic view, certain elements of an automated system for selecting discrete shim units, feeding them in a predetermined sequence to an insertion point, where they are presented serially for insertion into a channel and for inserting them into the appropriate channel.
FIG. 3 shows, in partially cut-away view, one example of a discrete shim unit for use in apparatus according to one embodiment of the invention.
FIG. 4 shows another example of a discrete shim unit for use in apparatus according to an embodiment of the invention.
FIG. 5 shows a further example of a discrete shim unit for use in apparatus according to another embodiment of the invention.