Magnetic resonance imaging apparatus

Abstract

In order to prevent the occurrence of motion artifacts and improve image quality, the first displacement N1 of the diaphragm before the scanning part (2) has performed the imaging sequence and the second displacement N2 of the diaphragm after the scanning part (2) has performed the imaging sequence are detected by the body motion detection part (25) Detection is performed as displacement caused by breathing motion of the subject (SU). Thereafter, based on the first displacement N1 and the second displacement N2 detected by the body motion detection section (25), imaging data is selected as raw data by a raw data selection section (26). Then, according to the imaging data selected as raw data by the raw data selection part (26), the slice image of the subject (SU) is generated by the image generation part (31).

Description

technical field [0001] The invention relates to magnetic resonance imaging equipment. Background technique [0002] Magnetic resonance imaging (MRI) equipment is widely used in various fields, including medical applications and industrial applications. [0003] The magnetic resonance imaging apparatus transmits electromagnetic waves to an object in a static magnetic field space, thereby exciting the rotation of protons in the object with a nuclear magnetic resonance (NMR) phenomenon, and scans to acquire magnetic resonance (MR) signals generated by the excited rotation. The magnetic resonance signals acquired in the scan are used as raw data for a slice image to generate a slice image of the subject. [0004] When a magnetic resonance imaging device is used to scan an object, if the object moves, motion artifacts may appear on the generated slice images. For example, when a subject's heart or abdomen is being imaged, body motion such as breathing or heart motion can cause ...

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Problems solved by technology

[0009] However, when the breathing motion becomes arrhythmic, i.e., for example, when the depth of breathing is significantly disturbed and varied, the diaphragm may be in a different position when performing the imaging sequence than in the periodic breathing motion, even if performed prior to the imaging sequence. Diaphragm displacements obtained by the navigator sequence fall within the predefined acceptance window

In this case, motion artifacts may appear, thus resulting in a loss of image quality

[0010] As described above, according to conventional techniques, the occurrence of motion artifacts cannot be sufficiently suppressed, and it is difficult to improve image quality

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