ultrasound was first used for medical purposes in the late 1960s.
ultrasound was first used for medical purposes in the late 1960s.
when was ultrasound first used for medical purposes?
the late 1960s
after the french physicist pierre curie’s discovery of piezoelectricity in 1880, ultrasonic waves could be deliberately generated for industry. thereafter, in 1940, the american acoustical physicist floyd firestone devised the first ultrasonic echo imaging device, the supersonic reflectoscope, to detect internal flaws in metal castings. in 1941, the austrian neurologist karl theo dussik was in collaboration with his brother, friedreich, a physicist, likely, the first person to ultrasonically echo image the human body, outlining thereby the ventricles of a human brain. ultrasonic energy was first applied to the human body for medical purposes by dr george ludwig at the naval medical research institute, bethesda, maryland in the late 1940s. english-born physicist john wild (1914–2009) first used ultrasound to assess the thickness of bowel tissue as early as 1949; he has been described as the "father of medical ultrasound". subsequent advances in the field took place concurrently in several countries. it was not until 1961 when david robinson and george kossoff's work at the australian department of health, resulted in the first commercially practical water path ultrasonic scanner. then in 1963 meyerdirk & wright launched production of the first commercial hand-held articulated arm compound contact b-mode scanner that ultrasound became generally available for medical use.
medical ultrasound
access to cannabis for medical purposes regulations









































the marihuana for medical purposes regulations (mmpr) was a set of canadian regulations enacted in july 2013 concerning the production, distribution and use of medical cannabis (rendered in canadian legislation as "marihuana"). portions of the law become effective on october 1, 2013, march 31, 2014 and march 31, 2015. the law was struck down as unconstitutional by the federal courts due to the inability for patients to grow their own medicine. the new act put forward is the access to cannabis for medical purposes regulations (acmpr).
access to cannabis for medical purposes regulations