|Ideal sources for Wikipedia's health content are defined in the guideline Wikipedia:Identifying reliable sources (medicine) and are typically review articles. Here are links to possibly useful sources of information about Impedance phlebography.
|WikiProject Medicine||(Rated Start-class, Low-importance)|
The statement, "For the chest, the technique was developed by NASA" is incorrect. Impedance Plethysmography was invented long before NASA existed. For example http://butler.cc.tut.fi/~malmivuo/bem/bembook/25/25.htm gives the following quote "The first publications concerning this method date back to the 1930s and 1940s (Atzler and Lehmann, 1931; Rosa, 1940; Holzer, Polzer, and Marko, 1946; Nyboer et al., 1940; Nyboer, Bango, and Nims, 1943; Nyboer, 1950). "