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US 8,818,487 B2Granted
Magnetic resonance imaging apparatus and magnetic resonance imaging method
AssigneesKabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
InventorShigehide Kuhara
Life of this patent
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Abstract
A magnetic resonance imaging apparatus controls image reconstruction based on magnetic resonance signals collected when a peak of detected respiration level falls within an allowable range which changes based on a change in a plurality of peak values of a plurality detected respiration levels.
Claims18
A magnetic resonance imaging (MRI) apparatus comprising:
- an MRI gantry and associated control circuits including at least one computer configured to collect magnetic resonance signals from a subject by applying a uniform static magnetic field, radio-frequency magnetic fields, and gradient magnetic fields to the subject in accordance with a predetermined pulse sequence;
- said control circuits including at least one computer configured to reconstruct an image concerning the subject based on the collected magnetic resonance signals;
- said control circuits being configured to detect a respiration level of the subject;
- said control circuits also being configured to control image reconstruction based on the collected magnetic resonance signals when a peak of the detected respiration level falls within an allowable range;
- and
- wherein said control circuits are configured to change the allowable range during an MRI scan which collects MRI signals from the subject in response to a change in a plurality of peak values of detected respiration levels.
3 more elements
A magnetic resonance imaging apparatus comprising:
- an MRI gantry and associated control circuits including at least one computer configured to collect magnetic resonance signals from a subject by applying a uniform static magnetic field, radio-frequency magnetic fields, and gradient magnetic fields to the subject in accordance with a predetermined pulse sequence;
- said control circuits including at least one computer configured to reconstruct an image concerning the subject based on the collected magnetic resonance signals;
- said control circuits being configured to detect a respiration level of the subject;
- and
- said control circuits also being configured to control collection and reconstruction of the magnetic resonance signals during an MRI scan which collects MRI signals from the subject when the rate of change of the detected respiration level is less than or equal to a predetermined rate, and to reconstruct the image in response to the thus collected magnetic resonance signals.
2 more elements
A magnetic resonance imaging apparatus comprising:
- an MRI gantry and associated control circuits including at least one computer configured to collect magnetic resonance signals from a subject by applying a uniform static magnetic field, radio-frequency magnetic fields, and gradient magnetic fields to the subject in accordance with a predetermined pulse sequence;
- said control circuits including at least one computer configured to reconstruct an image concerning the subject based on the collected magnetic resonance signals;
- said control circuits being configured to repeatedly detect a respiration level of the subject;
- said control circuits being configured to control the image reconstruction in response to the collected magnetic resonance signals when a peak of the detected respiration level falls within an allowable range;
- said control circuits being configured to repeatedly detect peak values of the detected respiration level in one cycle of a respiratory motion of the subject;
- said control circuits being configured to set the allowable range based on an average value of the peak values during a first period that the plurality of respiration levels are detected;
- and
- said control circuits being configured to control the allowable range setting frequency during an MRI scan which collects MRI signals from the subject in accordance with a frequency of the respiratory motion of the subject and to set the allowable range at the setting frequency.
5 more elements
A magnetic resonance imaging apparatus, comprising:
- an MRI gantry and associated control circuits including at least one computer configured to collect magnetic resonance signals from a subject by applying a uniform static magnetic field, radio-frequency magnetic fields, and gradient magnetic fields to the subject in accordance with a predetermined pulse sequence;
- said control circuits including at least one computer configured to reconstruct an image concerning the subject based on the collected magnetic resonance signals;
- said control circuits being configured to repeatedly detect a respiration level of the subject;
- said control circuits being configured to image reconstruction based on the collected magnetic resonance signals when a peak of the detected respiration level falls within an allowable range;
- said control circuits being configured to set a trackable range in response to the detected respiration level when or before starting collecting of the magnetic resonance signals which are used for image;
- and
- said control circuits being configured to set the allowable range within the trackable range during an MRI scan which collects MRI signals from the subject based on an average value of the peak values during a period that the plurality of respiration levels are detected.
4 more elements
A magnetic resonance imaging method comprising:
- collecting magnetic resonance signals from a subject by applying a uniform static magnetic field, radio-frequency magnetic fields, and gradient magnetic fields to the subject in accordance with a predetermined pulse sequence;
- repeatedly detecting a respiration level of the subject during execution of said predetermined pulse sequence;
- controlling image reconstruction based on magnetic resonance signals collected when a peak of the detected respiration level falls within an allowable range;
- and
- changing the allowable range during an MRI scan which collects MRI signals from the subject in response to a change in a plurality of peak values of a plurality of detected respiration levels.
2 more elements
Dependencies are inferred from the claim text.