MAGNETIC RESONANCE IMAGING DEVICE AND TIMING MISALIGNMENT DETECTION METHOD THEREOF

摘要

An objective of the present invention is, with a magnetic resonance imaging device which emits a gradient magnetic field with parallel driving of positive-side subcoils and negative-side subcoils with different power sources in the gradient magnetic field direction, to detect with good precision a misalignment in drive timing of the positive side and the negative side without employing an additional device. Pulse sequences for timing misalignment detection of a plurality of types having a slice gradient magnetic field pulse (201) and a read-out gradient magnetic field pulse (206) in the same direction as a gradient magnetic field of interest are executed. A positive-side slice echo and a negative-side slice echo of the gradient magnetic field are photographed. A phase difference between a positive-side projection image and a negative-side projection image is derived by computation with phase error from other factors being removed. From the slope of the phase difference with respect to a location, the drive timing misalignment between the positive-side subcoil and the negative-side subcoil of the gradient magnetic field emission is detected.