PURPOSE: To watch a patient in a magnet assembly easily from the outside by supporting an upper and a lower base yokes facing each other through two column yokes, and providing permanent magnets in facing surfaces of the upper and a lower base yokes.
CONSTITUTION: A magnet assembly 1 is composed of a lower base yoke cover 2a, a column yoke covers 3a, 3b, and an upper base yoke cover 2b to be cylindrical. A patient placed on a table A comprising a base B and a bed slide part C s put into a cylinder of the magnet assembly 1 of an MRI device by moving the bed slide part C. A magnetic circuit composing part of this magnet assembly supports a lower and upper base yokes 22a, 22b through two column yokes 23a, 23b, and permanent magnets 23a, 23b are fixed to facing surfaces of both base yokes 22a, 22b, and magnetic shunt plates 29a, 29b are fixed to facing surfaces of the permanent magnets 28a, 28b respectively.
SERIZAWA KATSUMI
FURUTA OSAMU
