Vanselow K, Heuck F
Rofo. 1975 Sep;123(3):268-73. doi: 10.1055/s-0029-1230193.
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.
在放射电影密度测定法中，随机变化可以通过两种方式进行平滑处理和减少：时间上（帧与帧之间）和空间上（每一帧）。然而，这两种方法都可能改变信号测量值。商数电影密度测定法的优势在于在不改变信号的情况下消除干扰或随机变化。这些变化在信号记录过程中被消除。其中包括：市电电压变化、显影不均匀、其他组织和器官的吸收。可以获得更合适的信噪比。如果动脉或静脉同时显影，通过商数电影密度测定法就有可能区分动脉期和静脉期，并将它们与覆盖组织分开进行分析。
