| 摘要 |
PURPOSE:To measure the magnetostatic field distribution with one photographing by using a nuclear magnetic resonance (NMR) signal to correct the change of phase due to factors other than the distortion of the magnetostatic field. CONSTITUTION:An NMR imaging device consists of a magnetic field driving part 204 which generates a magnetostatic field, an inclined magnetic field, and a high frequency magnetic field by a control signal from a magnetic field control part 203, a receiver 205 which detects the NMR signal from an object, and a processor 206 which performs the picture reconstituting operation of the detected signal. The interval of time between 90 deg. and 180 deg. pulses generated by the driving part 204 and the interval of between time origins of the 180 deg. pulse and a spin echo signal are made different from each other, and the generated spin echo signal is sampled. The processor performs the picture reconstituting operation including correction processings of the phase deviation due to the receiver 205 and the phase deviation due to the difference of time interval with respect to this sampling signal, and the magnetostatic field distribution is obtained in accordance with relations between the phase variable and the distortion. |
