Magnetic resonance imaging apparatus and control method thereof

摘要

A magnetic resonance imaging apparatus includes a collection unit that 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, an imaging unit that images the subject based on the magnetic resonance signal collected by the collection unit, a detection unit that detects a respiratory level of the subject, an informing unit that informs the subject of whether the detected respiratory level falls within an allowable range, and a unit that 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 apparatus comprising:
an MRI gantry having a static magnetic field generator, gradient magnetic field generators and at least one radio-frequency (RF) antenna configured to send RF signals into an image volume and to receive RF signals from said image volume and a control system including at least one computer configured to control the MRI gantry components; said control system being configured to apply to a subject (a) a uniform static magnetic field, (b) a radio-frequency magnetic field and (c) a gradient magnetic field to the subject in accordance with a predetermined pulse sequence to collect (i) magnetic resonance signals from the subject within one heart beat interval to reconstruct images of each of a plurality of slabs using phase encoding magnetic gradient fields, said control system also being configured to collect from said subject during said heart beat period (ii) a magnetic resonance signal to monitor subject motion in response to a first motion probing pulse (MPP) subsequence and (iii) at least one magnetic resonance signal to generate a display to the subject without applying a phase-encoding gradient magnetic field in response to at least one second MPP subsequence; said control system being further configured to reconstruct an image of an imaging region containing the plurality of slabs using the collected magnetic resonance signals (i) for reconstruction; said control system also being configured to detect a first respiratory level for the subject using the magnetic resonance signal (ii) for monitoring and to detect a second respiratory level for the subject using the at least one magnetic resonance signal (iii) for display; said control system beinq configured to control the reconstruction of an image of the subject using the magnetic resonance signals (i) for reconstruction collected when the detected first respiratory level falls within an allowable range that is set with respect to each of the plurality of slabs; and said control system being configured to set a single allowable range that is applied to each of the plurality of slabs using respiratory levels detected before the collection of magnetic resonance signals for a first slab in the plurality of slabs to be imaged begins.