 By late 1957 the first contact B-mode scanner was constructed and in clinical use by that year.The design was patented by Kelvin & Hughes in 1957 with Brown being named the inventor with commercial rights assigned to the company.In a landmark paper in June 1958, published by Donald, McVicar and Brown in The Lancet, they discussed the development of the A-mode scanner and decisions that led up to the B-mode scanner.