Bone MRI using B0 inhomogeneity map and a subject magnetic susceptibility map

A method of operating an medical, wherein the medical instrument comprises a magnetic resonance imaging system for acquiring magnetic resonance data from a subject within an imaging zone, wherein the magnetic resonance imaging system comprises a main magnet for generating a B0 magnetic field within an imaging zone,

• wherein the method comprises the steps of:
• acquiring the magnetic resonance data by controlling the magnetic resonance imaging system with pulse sequence commands;
• receiving a subject magnetic susceptibility map of the subject;
• calculating a B0 inhomogeneity map from the magnetic resonance data;
• calculating a subject B0 magnetic field perturbation from the subject magnetic susceptibility map;
• calculating a residual B0 magnetic field perturbation by subtracting the subject B0 magnetic field perturbation from the B0 inhomogeneity map;
• and
• calculating a bone map from the residual B0 magnetic field perturbation.

A computer program product comprising machine executable instructions for execution by a processor controlling a medical instrument wherein the medical instrument comprises a magnetic resonance imaging system for acquiring magnetic resonance data from a subject within an imaging zone, wherein the magnetic resonance imaging system comprises a main magnet for generating a B0 magnetic field within an imaging zone, wherein execution of the machine executable instructions causes the processor to:

• acquire the magnetic resonance data by controlling the magnetic resonance imaging system with pulse sequence commands;
• receive a subject magnetic susceptibility map of the subject;
• calculate a B0 inhomogeneity map from the magnetic resonance data;
• calculate a subject B0 magnetic field perturbation from the subject magnetic susceptibility map;
• calculate a residual B0 magnetic field perturbation by subtracting the subject B0 magnetic field perturbation from the B0 inhomogeneity map;
• and
• calculate a bone map from the residual B0 magnetic field perturbation.