| 摘要 |
PURPOSE:To shorten a scanning time, by directing magnetization M to a -z- axis direction by using a control means having sequence function before directing the same to a +z-axis direction directly thereafter. CONSTITUTION:When a Z-gradient magnetic field Gz+ is applied to an object to be inspected, all directions of magnetization M come to a z-axis positive direction. When a 90 deg.x pulse and magnetic fields Gx, Gy are applied and a linear gradient field gx1 in an x-axis direction is subsequently applied, shift is generated in a spin phase in an x-direction and, at the same time, linear gradient magnetic fields gy1, gy2 having different polarities are successively applied in a y-axis direction. Spin dispersed by gy1 gathers by gy2 and comes to an echo signal. Next, one 180 deg.-x pulse and gradient magnetic fields Gz, Gx are applied while a 90 deg.-x pulse is applied and, at this time, a gradient magnetic field Gy is also applied and a 180 deg.x pulse is succeedingly applied. Whereupon, magnetization M in each region is entirely directed to the +z-axis direction. Further, spoilers Hz, Hx, Hy for removing the correlation between sequences are applied. By the above mentioned method, the same state as the initial point of time is restored. |
