Apparatus and method for reducing image artifact
First Claim
1. A magnetic resonance imaging apparatus comprising:
- a scanning device configured to repetitively perform an imaging sequence in which an electromagnetic wave is emitted toward a subject in a static magnetic field space to excite an imaged region in the subject, and magnetic resonance signals generated in the imaged region in the subject are acquired as imaging data;
a body motion detecting device configured to repetitively detect a displacement caused by body motion of the subject each time said scanning device performs the imaging sequence;
a raw data selecting device configured to select the imaging data acquired by said scanning device performing the imaging sequence as raw data based on the displacement caused by body motion of the subject detected by said body motion detecting device; and
an image producing device configured to produce an image of the subject based on the imaging data selected as raw data by said raw data selecting device,wherein said body motion detecting device is configured to detect, as the displacement caused by body motion of the subject, a first displacement before said scanning device performs the imaging sequence and a second displacement after said scanning device has performed the imaging sequence, andsaid raw data selecting device is configured to select the imaging data as raw data based on the first displacement detected by said body motion detecting device and the second displacement detected by said body motion detecting device.
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Accused Products
Abstract
For the purpose of preventing development of motion artifacts and improving image quality, a first displacement N1 of the diaphragm before a scanning section 2 performs an imaging sequence and a second displacement N2 of the diaphragm after the scanning section 2 has performed the imaging sequence are detected by a body motion detecting section 25 as displacement caused by respiratory motion of a subject. Thereafter, based on the first displacement N1 and second displacement N2 of the diaphragm detected by the body motion detecting section 25, imaging data is selected as raw data by a raw data selecting section 26. Then, based on the imaging data selected as raw data by the raw data selecting section 26, a slice image of the subject is produced by an image producing section 31.
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Citations
20 Claims
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1. A magnetic resonance imaging apparatus comprising:
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a scanning device configured to repetitively perform an imaging sequence in which an electromagnetic wave is emitted toward a subject in a static magnetic field space to excite an imaged region in the subject, and magnetic resonance signals generated in the imaged region in the subject are acquired as imaging data; a body motion detecting device configured to repetitively detect a displacement caused by body motion of the subject each time said scanning device performs the imaging sequence; a raw data selecting device configured to select the imaging data acquired by said scanning device performing the imaging sequence as raw data based on the displacement caused by body motion of the subject detected by said body motion detecting device; and an image producing device configured to produce an image of the subject based on the imaging data selected as raw data by said raw data selecting device, wherein said body motion detecting device is configured to detect, as the displacement caused by body motion of the subject, a first displacement before said scanning device performs the imaging sequence and a second displacement after said scanning device has performed the imaging sequence, and said raw data selecting device is configured to select the imaging data as raw data based on the first displacement detected by said body motion detecting device and the second displacement detected by said body motion detecting device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for reducing imaging artifacts in a magnetic resonance image, said method comprising:
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performing an imaging sequence in which an electromagnetic wave is emitted toward a subject in a static magnetic field space to excite an imaged region in the subject; detecting a displacement of the subject for each imaging sequence performed; selecting raw imaging data that is acquired during the performed imaging sequence based on the displacement of the subject caused by a body motion of the subject; and producing an image of the subject based on the selected raw imaging data. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification