| 摘要 |
PURPOSE:To remove the artifact of an image which is generate by a noise component by determining a frequency line which contains a noise and smoothing only the line. CONSTITUTION:While 90 deg. pulses from an RF control part 3 are irradiated with through a transmitter 5, a control part 8 applies a gradient magnetic field in the (z) direction by using a coil 12. Then, 180 deg. pulses are irradiated with similarly and a spin is inverted by 180 deg.; and then gradient magnetic fields in the (x) and (y) directions are applied by using coils 10 and 11, and at the same time an NMR signal is measured through a receiver 6 and Fourier-transformed to obtain projection data. The Fourier transform is performed in the longitudinal direction of this rotation to determine a line containing a noise on the basis of the content of a high-frequency component. Then, each projection data is filtered for smoothing only within the determined range, and the projection data is processed by inverse Fourier transform to generate an NMR signal, which is used to reconstitute an image by projecting reconstitution. |
