Magnetic resonance imaging device and sensitivity distribution calculation program

A magnetic resonance imaging device comprising:

• a measurement unit that is provided with a receiving coil having a plurality of channels and is configured to measure a nuclear magnetic resonance signal of a subject for each channel of the receiving coil;
• and
• an image calculation unit configured to create an image of the subject using a sensitivity distribution for each channel of the receiving coil and a channel image generated based on the nuclear magnetic resonance signal for each channel measured by the measurement unit, wherein
• the image calculation unit includes a sensitivity distribution calculation unit configured to calculate a sensitivity distribution for each channel of the receiving coil in a k-space using an image obtained for sensitivity distribution, and
• the sensitivity distribution calculation unit includes an expanded image creation unit configured to generate, by executing one or more inversion processes on at least a part of the image for obtaining sensitivity distribution, an expanded image obtained by combining the image for obtaining sensitivity distribution and an inverted image, and calculates the sensitivity distribution using the expanded image.