[Measurement and differential demonstration of renal blood flow by computer angiography (author's transl)]. / Die Messung und differenzierte bildliche Darstellung der Nierendurchblutung mit der Computerangiographie.

A new computer-aided x-ray technique is presented which, unlike conventional cine- or video-densitometry, allows a high-resolution quantitative display of the parameters of renal blood flow as so-called 'functional images'. The parameters include blood flow velocity and local perfusion of the kidney. This technique, which we call computer angiography, has decisive advantages; the functional images provide more, and more rapid, information on renal blood flow dynamics than can be obtained by the qualitative evaluation of a series of pictures. The clinical relevance of computer angiography is illustrated by a nephrotic syndrome, polycystic disease and a hypernephroma.

Computer angiography: a new tool for x-ray functional diagnostics.

The method of functional imaging is applied to x-ray angiograms. Functional images are generated by inserting at each point of an x-ray image a computed grey or colour value proportional to a dynamic parameter (such as blood velocity) instead of the recorded x-ray absorption value. For this purpose a new system for angiographic image processing has been developed. First results show that the method which we have called Computer Angiography is a tool to extract more information about the blood dynamics in organs in an easier and faster way than with the conventional angiographic technique.