G | PHYSICS |
01 | MEASURING; TESTING |
R | MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES |
33 | Arrangements or instruments for measuring magnetic variables |
20 | involving magnetic resonance |
44 | using nuclear magnetic resonance [NMR] |
48 | NMR imaging systems |
54 | Signal processing systems, e.g. using pulse sequences ; , Generation or control of pulse sequences |
56 | Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution |
561 | by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences |
5615 | Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] |
5616 | using gradient refocusing, e.g. EPI |