Magnetic resonance imaging apparatus and magnetic resonance imaging method
AssigneeHitachi Medical Corporation
InventorsMiyuki Kawamura, Masahiro Takizawa
Life of this patent
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Abstract
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.
Claims13
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 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.
A magnetic resonance imaging method of acquiring 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 method comprising:
- a data collection step of collecting a magnetic resonance signal corresponding to each specific region 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 step of correcting the specific region data to generate corrected data;
- and
- an image reconstruction step of reconstructing an image from the corrected data,
- wherein the data correction step includes a correction information calculation step of calculating as correction information an amount of 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 a benchmark slice as a reference and a correction step of correcting data of the other specific regions for all slices using the calculated correction information of each of the other specific regions.
Dependencies are inferred from the claim text.