| 摘要 |
<p>PURPOSE:To enable a mover to be clearly obtained in its picture image by adopting a pulse sequence having an inclined magnetic field waveform additionally applying two pulses with the same integrating value of magnetic field intensity further with action in reverse polarity. CONSTITUTION:In a pulse sequence, two pulse waveforms are newly added to a phase encoding Gy waveform. These two pulse waveforms, starting from times t', t'' in both sides of a pulse, equally generate height (magnetic field intensity) G' and a pulse width (magnetic field applying time) B. An inclined magnetic field Gy provides the same integrating value of magnetic field intensity acting in reverse polarity for a magnetic spin, and a phase shift amount in a fixed part negates each other to zero. On the contrary, for a mover to move in a speed (v), because the phase shift amount is given always in a sequence with phase encoding inclined magnetic field intensity being zero, no case with zero phase shift amount in a moving part is generated. As the result, enabling the mover to always increase its phase shift amount, a clear picture image of a blood vessel or the like in its moving part can be obtained.</p> |
