FILTERING METHOD FOR OSCILLATORY B0 BEHAVIOR OF NUCLEAR MAGNETIC RESONANCE APPARATUS

摘要

PROBLEM TO BE SOLVED: To compensate the influence of an oscillatory B0 eddy current in an NMR apparatus. SOLUTION: An NMR apparatus having both a transmitter which generates spin excitation signals and a receiver which detects NMR signals analyzes an applied gradient signal and estimates a resulting oscillatory B0 eddy current Bee(t). The frequencies of either or both of the transmitter and receiver of the NMR apparatus are shifted as to frequency by an amount proportional to Be(t) to perform compensation. The applied gradient signal is digitized and is filtered by use of a regenerative filter 10 based on the oscillation model of the oscillatory B0 eddy current Be(t).