2016/4/12 1971 Raymond Damadaphysicianmnte us t e is differe vater means more 二会 1974 Paul Lauterbur,a chemist and an NMR pioneer at the State University of New York.Stony Brook.produced the first NMR image.It was of a test tube. 3 1975 Richard Ernst proposes using phase and fr ransform for acquisition of MR images.2016/4/12 7 • 1956 The "Tesla Unit" was proclaimed in the Rathaus of Munich, Germany by the International Electro-technical Commission￾Committee of Action. All MRI machines are calibrated in "Tesla Units". The strength of a magnetic field is measured in Tesla or Gauss Units. The stronger the magnetic field, the stronger the amount of radio signals which can be elicited from the body's atoms and therefore the higher the quality of MRI images. • 1971 Raymond Damadian, a physician and experimenter working at Brooklyn's Downstate Medical Center discovered that hydrogen signal in cancerous tissue is different from that of healthy tissue because tumors contain more water. More water means more hydrogen atoms. When the NMR machine was switched off, the bath of radio waves from cancerous tissue will linger longer then those from the healthy tissue. • 1972 Raymond Damadian applies for a patent, which describes the concept of NMR being used for above purpose. He illustrates major parts of MRI machine in his patent application. • 1974 Paul Lauterbur, a chemist and an NMR pioneer at the State University of New York, Stony Brook, produced the first NMR image. It was of a test tube. • 1975 Richard Ernst proposes using phase and frequency encoding and Fourier transform for acquisition of MR images