Background Immortalized cell lines have been used extensively in cancer biology and as a model system to test the efficacy of vaccines, but their use is becoming increasingly limited because of extensive genetic and phenotypic variations compared to those expressed in cancer patients. Similarly
Background A Magnetic Resonance Imaging (MRI) scanner applies magnetic fields to a human or animal in order to generate an image of a specific region of the body. Due to a number of internal and external effects, these fields are never completely homogeneous. Distortion of the magnetic fields may