The principles of obtaining the physical quantity of magnetic susceptibility using MRI are being presented. Quantitative Susceptibility Mapping (QSM) reflects tissue susceptibility using the MR phase information acquired using a gradient echo sequence. To obtain susceptibility maps several steps are required in the reconstruction, including (i) phase measurement, (ii) field map estimation, (iii) background field removal, and (iv) susceptibility map calculation by solving the inverse problem. Examples and challenges of QSM are presented and discussed.
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