JPS6464637A - Nuclear magnetic resonance imaging apparatus - Google Patents

Abstract

PURPOSE:To reduce a coil control time and to reduce power consumption by the effect of an iron core, by winding a coil around an opposed magnetic pole piece to form a coil with an iron core and forming the opposed surface of the magnetic pole piece so that the central part thereof becomes a protruding part or recessed cavity. CONSTITUTION:Magnetic pole pieces 2, each of which constituted so that a non- magnetic coil support jig 8 having a coil 6 wound in a solenoid shape so as to form a magnetic field provided to the inside thereof and the copper pipe 7 for cooling the heat of the coil 6 provided to the outer periphery thereof is fixed to the outer periphery thereof, are opposed so as to provide a gap 1. In order to set the uniformity of the magnetic field of an imaging space to several 10ppm or less, a protruding part 13 is provided to the central part of each of the magnetic pole pieces 2 and a protruding part 14 is provided to the magnetic pole piece 2 toward the peripheral edge part thereof and a current is allowed to flow to the coil 6 to achieve the uniformity of the magnetic field at the time of the generation of the magnetic field by this effect. As mentioned above, since the uniformity is almost determined by the shape of each magnetic pole piece 2 and the complicated control in a normally conductive coil is unnecessary and the reduction of running cost due to an iron core is expected.