1. A method of generating a contrast enhanced nuclear magnetic resonance image, comprising carrying out a predetermined imaging pulse sequence by an MRI apparatus means to obtain nuclear magnetic resonance image signals of a parameter of a nuclear magnetic resonance image; operating non-linearly on the nuclear magnetic resonance image signals by a processor means for processing the nuclear magnetic resonance image signals obtained by the MRI apparatus means, to obtain contrast enhanced image signals having an enhanced contrast of said parameter; and forming and displaying the contrast enhanced nuclear magnetic resonance image according to said contrast enhanced image signals obtained by the processor means.