title: Videodensitometry for measuring blood vessel diameter.
abstract: A method employing a special computer for determining the internal diameters of blood vessels from photofluorographic image is described; in vitro and in vivo experiments are performed with the system. The amount of contrast medium injected is restricted to 4 times 3 ml, and it is possible to determine the diameter (in the range from 2 to 16 mm) at any place where blood vessels can be catheterized. In the in vivo experiments the maximum systematic error is +/-5 percent in the 7 to 8 mm range.
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods*; D000792:Angiography; D000818:Animals; D001808:Blood Vessels / Q000033:anatomy & histology*; D003201:Computers; D003287:Contrast Media; D004285:Dogs; D010779:Photofluorography; D014743:Videotape Recording
chemical_list: D003287:Contrast Media