NMR MEASURING DEVICE AND METHOD FOR OPERATING MAGNETIC FIELD MAP

摘要

To provide an NMR measuring device that reduces the number of measurements and reduce the total measurement time in generating a magnetic field map that shows the distribution of an uneven magnetic field component.SOLUTION: In a preliminary measuring step S30, an off-set map is obtained in advance. Execution of the longτ pulse sequence (S32) generates a phase map (S34). The magnetic field map is operated on the basis of the phase map and the phase offset map (S36). A shim is adjusted on the basis of the magnetic field map (S40). The offset map is operated on the basis of a first phase map obtained by execution of the first pulse sequence, a second phase map obtained by a second pulse sequence, and the ratio α for a phase expansion time.SELECTED DRAWING: Figure 4