APPARATUS FOR OBTAINING SIGNAL CONTAINING SPIN/SPIN RELAXING TIME DATA

PURPOSE:To obtain the image of the first echo signal of a sufficiently short echo time and the image of the second echo signal of a long echo time having no artifact, by obtaining the first echo signal only by the change-over of a 90 deg.-pulse and an inclined magnetic field without using a plurality of 180 deg.-pulses and obtaining the second echo signal using the 180 deg.-pulse. CONSTITUTION:The direction of the magnetic field generated by a magnet 1 for generating a static magnetic field is set to a Z-axis and an object to be examined 2, for example, a person is arranged in the static magnetic field by the magnet 1. A 90 deg.-pulse is applied using a coil 7 in such a state that a Y-axis direction inclined magnetic field Gy is applied for the purpose of slice selection at a period t1. As a result, the nuclear spin within the selected plane obtained by cutting the object 2 to be examined in a direction vertical to a Y-axis at the specific point on the Y-axis is excited. Next, an X-axis direction inclined magnetic field Gx is applied for a definite time at a period t2 and the nuclear spin is dephased. The direction of the X-axis direction inclined magnetic field Gx is changed over at a period t2 to form a reading magnetic field. The nuclear spin is rephased by this magnetic field Gx. The first echo signal P1 is obtained at this period t3. As mentioned above, a required image is obtained only by the successive change-over of an inclined magnetic field.