Magnetic resonance imaging apparatus and control method thereof

摘要

A magnetic resonance imaging apparatus includes a collection unit which applies a uniform static magnetic field to a subject and also applies a radio-frequency magnetic field and a gradient magnetic field to the subject in accordance with a predetermined pulse sequence to collect a magnetic resonance signal from the subject, a imaging unit which images the subject based on the magnetic resonance signal collected by the collection unit, a detection unit which detects a respiratory level of the subject, an informing unit which informs the subject of whether the detected respiratory level falls within an allowable range, and a unit which controls the collection unit and the imaging unit in such a manner that the magnetic resonance signal for imaging is collected and the subject is imaged based on the thus collected magnetic resonance signal for imaging when the detected respiratory level falls within the allowable range.

主权项

1. A magnetic resonance imaging (MRI) apparatus comprising:
MRI gantry components including static and gradient magnetic field generators, at least one radio frequency (RF) coil coupled to an imaging volume, at least one RF transmitter, at least one RF receiver and at least one control computer having a processor and memory configured to control said gantry components so as to effect operations including: applying a uniform static magnetic field to a subject; applying a radio-frequency magnetic field and a gradient magnetic field to the subject in accordance with a predetermined pulse sequence and collecting from the subject within one heart beat period of the subject (a) magnetic resonance signals for reconstruction acquired using phase encoding magnetic gradient fields, and (b) a magnetic resonance signal for monitoring and at least one magnetic resonance signal for display both acquired without applying phase encoding gradient magnetic fields; detecting a first respiratory level for the subject using the magnetic resonance signal for monitoring; detecting a second respiratory level for the subject using the at least one magnetic resonance signal for display; generating a display image of the detected second respiratory level, an upper threshold of an allowable range and a lower threshold of the allowable range; causing a display system to display the generated display image to the subject; and reconstructing an image of the subject using the collected magnetic resonance signals for reconstruction when the detected first respiratory level falls within the allowable range.