Thus it was the discovery of strongly variant relaxation times that led to Lauterbur's quest to represent these relaxation time differences graphically. Without these differences, unknown until Damadian's work, there would be nothing to make an image with. Hence a book on MRI history, which included chapters on both Damadian and Lauterbur, Chapter 8 entitled, “Raymond V. Damadian: Originator of the Concept of Whole-Body NMR Scanning (MRI) and Discoverer of the NMR Tissue Relaxation Differences That Made It Possible.” The book pointed out the importance of both men: