MAGNETIC RESONANCE IMGING APPARATUS

摘要

A magnetic resonance image associated with a subject is created by executing an MRI imaging sequence and displayed on a monitor. Marks (6, 7, 8) are given to areas of interest such as a bifurcating part (3) and a constricted part (4) of a blood vessel in the image (1) displayed on the monitor. At least either the frame rate of the image (the reciprocal of the interval between image updates) or the spatial resolution is increased if the distance between an invasive device (10) and a mark both displayed in the image lies in a preset range so that the imaging speed may be automatically increased when the invasive device reaches the area of interest. Alternatively the spatial resolution is increased so that the minute movement of the invasive device and the positional relationship between the invasive device and the blood vessel are accurately monitored by observing the image. When the invasive device is tracked, at least two singular points provided on the invasive device and displayed in the magnetic resonance image are measured, and the three-dimensional position and direction of movement of the invasive device are determined from the angles between the line connecting the two singular points and the orthogonal three axes.