MAGNETIC RESONANCE IMAGING APPARATUS, IMAGE PROCESSING APPARATUS, AND SUSCEPTIBILITY MAP CALCULATION METHOD

摘要

Disclosed is a magnetic resonance imaging apparatus that calculates a susceptibility map using a weighting image that reflects a phase variation with high accuracy. The weighting image is calculated from a phase image obtained from a complex image obtained by MRI. First, a region used in calculation of the phase variation is set as a calculation region, and then, a standard deviation or a variance of pixel values of the phase image in the calculation region is set as the phase variation. Further, the phase variation is converted into a weight that monotonically decreases in a broad sense as the phase variation increases to obtain the weighting image.

主权项

1. A magnetic resonance imaging apparatus comprising:
a scan controller configured to measure a magnetic resonance signal generated from a subject according to irradiation of a radio frequency magnetic field pulse as a complex signal; an image reconstructor configured to reconstruct a complex image in which a pixel value is a complex number from the complex signal; an image converter configured to convert the complex image into a susceptibility map; and a display processor configured to display the susceptibility map in a display device, wherein the image converter comprises a phase image generator configured to generate a phase image from the complex image, a weighting image calculator configured to calculate a weighting image from the phase image, and a susceptibility map calculator configured to calculate the susceptibility map from the phase image and the weighting image.