title: [New bases and theories from improving angio-cine-densitometry. II Improvements in the signal-to-noise ratio by the quotient method in cine densitometry].
abstract: In radio-cine-densitometry, random variations can be smoothed and reduced in two ways: temporal (frame to frame) and spatial (each frame). Both methods may, however, alter the signal measurements. The advantage of quotient cine-densitometry depends on the elimination of interference or random variations without changing the signal. Elimination of the variations occurs during signal recording. Amongst others the following are eliminated: variations in mains voltage, uneven development, absorption by other tissues and organs. A more suitable signal-to-noise ratio can be obtained. If an artery or a vein are opacified simultaneously it is possible, by means of quotient cine densitometry, to distinguish the arterial and venous phase and to analyse these separately from the overlying tissues.
mesh_terms: D015502:Absorptiometry, Photon / Q000592:standards*; D002932:Cineangiography / Q000592:standards*; D005860:Germany, West
vernacular_title: Neue Grundlagen und Theorien zur Verbesserung der Angio-Cine-Densitometrie. II. Die Verbesserung des Signal-Rauschverhältnisses durch das Quotientenverfahren in der Cine-Densitometrie