title: A technique of scatter and glare correction for videodensitometric studies in digital subtraction videoangiography.
abstract: The logarithmic amplification of video signals and the availability of data in digital form make digital subtraction videoangiography a suitable tool for videodensitometric estimation of physiological quantities. A system for this purpose was implemented with a digital video image processor. However, it was found that the radiation scattering and veiling glare present in the image-intensified video must be removed to make meaningful quantitations. An algorithm to make such a correction was developed and is presented. With this correction, the videodensitometry system was calibrated with phantoms and used to measure the left ventricular ejection fraction of a canine heart.
mesh_terms: D015502:Absorptiometry, Photon / Q000295:instrumentation / Q000379:methods*; D000790:Angiocardiography / Q000379:methods*; D000818:Animals; D003201:Computers; D004285:Dogs; D012542:Scattering, Radiation; D013318:Stroke Volume; D013382:Subtraction Technique; D014963:X-Ray Intensifying Screens