1. A method for in vivo calculating a local specific energy absorption rate based on an electric parameter and a mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency antenna, the method comprising acts of: segmenting an image of the object to obtain the segmented geometry of the object; obtaining pre-determined values of the electric parameter and the mass density taken from literature for tissue similar to a tissue of interest within the object included in the segmented geometry to be irradiated with radio frequency power for obtaining images of the tissue of interest; assigning the pre-determined values to the tissue of interest; performing a magnetic resonance scan; estimating the magnetic field vector distribution by a magnetic field mapping method based on the magnetic resonance scan performed by a scanner; and in vivo calculating the local specific energy absorption rate specific to the scanner and to an anatomy and a position of the object based on the pre-determined values of the electric parameter and the mass density assigned to the tissue of interest and the estimated magnetic field vector distribution.