X-Ray Functional Imaging--evaluation Of The Properties Of Different Parameters

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Abstract
It has been shown that perception of the information in angiographic images can be decisively improved through digital image processing1. The application of one such technique, the method of parametric or functional imaging, to studies of the kidney, liver, brain, the heart and other organs has been demonstrated by our group in previous publications2,3,4 First used in nuclear medicines, the fundamental idea of functional imaging is to replace a temporal sequence of images with a single static image which displays a certain aspect of the temporal change. The advantage of the method is two-fold: Often important intensity changes with a striking time structure are hard to perceive directly from the image sequence because the amplitude of the intensity variation is small. Also the human visual system is very well suited to the assessment of static images, but has difficulties in quantifying temporal changes. Parametric image processing thus yields images which enhance certain aspects of temporal change. This paper attempts to summarise the parameters found to be most useful in a variety of clinical applications.

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