G PHYSICS
G01 MEASURING; TESTING
G01R MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R33/00 Arrangements or instruments for measuring magnetic variables
G01R33/20 involving magnetic resonance
G01R33/28 Details of apparatus provided for in groups G01R33/44 - G01R33/64
G01R33/32 Excitation or detection systems, e.g. using radio frequency signals
G01R33/36 Electrical details, e.g. matching or coupling of the coil to the receiver
G01R33/3664 Switching for purposes other than coil coupling or decoupling, e.g. switching between a phased array mode and a quadrature mode, switching between surface coil modes of different geometrical shapes, switching from a whole body reception coil to a local reception coil or switching for automatic coil selection in moving table MR or for changing the field-of-view