Patent ID: 8971992
Filing Date: 2015-03-03
Classification: A61B,G01R

Abstract:
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.