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
G01R33/44 using nuclear magnetic resonance [NMR]
G01R33/48 NMR imaging systems
G01R33/54 Signal processing systems, e.g. using pulse sequences; ; Generation or control of pulse sequences; Operator console
G01R33/56 Image enhancement or correction, e.g. subtraction or averaging techniques; , e.g. improvement of signal-to-noise ratio and resolution