Magnetic resonance imaging apparatus and magnetic resonance imaging method configured to correct specific region data based on benchmark slice

摘要

In multi-slice imaging of a magnetic resonance imaging apparatus based on a non-Cartesian sampling method in which an overlap portion is generated in k space, stable body movement correction is realized at high speed. In order to do so, the rotation and translation of an object is detected for each specific region (in the case of a hybrid radial method, each blade) using a most characteristic slice in the imaging region, and the detected body movement is used for body movement correction of the specific region in all slices. The slice used for correction may be determined using a mathematical analysis result, such as correlation. In addition, data collection and correction processing may be performed in parallel.

主权项

1. A magnetic resonance imaging apparatus that acquires an image of each slice of an object on the basis of magnetic resonance signals measured from a plurality of slices of the object arranged in a static magnetic field, the apparatus comprising:
a data collection unit that collects a magnetic resonance signal corresponding to each specific region amongst a plurality of specific regions, as specific region data, by rotating a specific region, which includes an origin of k space and a vicinity of the origin, around the origin; a data correction unit that corrects the specific region data to generate corrected specific region data; and an image reconstruction unit that reconstructs an image from the corrected specific region data, wherein the data correction unit sets one of the plurality of slices as a benchmark slice, detects body movement of the object, which occurs between measurement of a reference specific region as a reference of the plurality of specific regions and measurement of other specific regions excluding the reference specific region, in the benchmark slice, corrects specific region data of the other specific regions in all slices so as to eliminate an influence of the detected body movement on an image, and sets specific region data of the reference specific region and specific region data after correction of the other specific regions as the corrected specific region data in each slice, wherein the data correction unit includes a benchmark slice determination unit that determines the benchmark slice, and the benchmark slice determination unit determines a slice of which a predetermined feature amount is maximum or minimum, among all slices, as the benchmark slice.