Method and system for measuring and calibrating imaging magnetic field in magnetic resonance apparatus

An MRI method implemented on a magnetic resonance apparatus connected to a computing device, comprising:

• providing, by a magnetic component, an imaging magnetic field including a main imaging magnetic field and a gradient magnetic field, where the imaging magnetic field is configured to scan an object to be imaged;
• providing, by a coil, a measurement RF signal, the measurement RF signal stimulating a monitoring sample to generate at least one measurement magnetic resonance signal corresponding to the imaging magnetic field;
• acquiring, by a probe, the at least one measurement magnetic resonance signal corresponding to the imaging magnetic field;
• establishing, by the computing device, a physical model based on the at least one measurement magnetic resonance signal;
• predicting an actual magnetic field intensity of the imaging magnetic field based on the physical model;
• and
• obtaining an image by performing, by the computing device, image reconstruction according to data obtained under the actual magnetic field intensity of the imaging magnetic field in combination with a difference between the actual magnetic field intensity of the imaging magnetic field and a target magnetic field intensity of the imaging magnetic field.