In 1974, he received the first patent in the field of MRI when he patented the concept of NMR for detecting cancer after filing an application in 1972. As the National Science Foundation notes, “The patent included the idea of using NMR to ‘scan’ the human body to locate cancerous tissue.” However, it did not describe a method for generating pictures from such a scan or precisely how such a scan might be done. However, Damadian's recognition that NMR relaxation time can be used to distinguish different tissue types and malignant tissue is what gives MRI its contrast to tissue types.