Method and system for determining magnetic susceptibility distribution

A system comprising:

• at least one storage including a set of instructions or programs for determining a distribution map of susceptibility property of an object;
• at least one processor configured to communicate with the at least one storage, wherein when executing the set of instructions or programs, the at least one processor is directed to perform operations including:
• obtaining a phase diagram corresponding to a magnetic resonance (MR) signal of the object;
• determining a preliminary field map based on the phase diagram;
• obtaining preliminary error limiting information associated with the preliminary field map;
• determining, based on the preliminary field map and the preliminary error limiting information, a preliminary distribution map of susceptibility property of the object;
• performing an iteration process including at least one iteration, wherein in each of the at least one iteration includes:
• updating error limiting information in a current iteration based on a distribution map of susceptibility property of the object updated in a preceding iteration;
• updating the distribution map of susceptibility property of the object in the current iteration based on the error limiting information updated in the current iteration;
• and
• performing a comparison based on the updated distribution map in the current iteration and the preliminary field map;
• and
• designating the updated distribution map of susceptibility property of the object as a target distribution map of susceptibility property of the object.

A computer readable medium comprising executable instructions or programs that, when executed by at least one processor, cause the at least one processor to effectuate a method comprising:

• obtaining a phase diagram corresponding to a magnetic resonance (MR) signal of the object;
• determining a preliminary field map based on the phase diagram;
• obtaining preliminary error limiting information associated with the preliminary field map;
• determining, based on the preliminary field map and the preliminary error limiting information, a preliminary distribution map of susceptibility property of the object;
• performing an iteration process including at least one iteration, wherein each of the at least one iteration includes:
• updating error limiting information in a current iteration based on a distribution map of susceptibility property of the object updated in a preceding iteration;
• updating the distribution map of susceptibility property of the object in the current iteration based on the error limiting information updated in the current iteration;
• and
• performing a comparison based on the updated distribution map in the current iteration and the preliminary field map;
• and
• designating the updated distribution map of susceptibility property of the object as a target distribution map of susceptibility property of the object.