Dynamic tomographic digital subtraction angiography using temporal filtration.

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Abstract
A variation of temporal recursive filtering for i.v. and intra-arterial digital subtraction angiography (DSA) is described. It results in a dynamic tomographic DSA display that may improve i.v. DSA performance by removing the confusion introduced by vessel overlap and reducing the severity of motion artifacts. A conventional circular tomographic apparatus was modified by the addition of a 23-cm image intensifier-television chain and made to run continuously at 1 revolution each 1.5 s. The video output was processed by the recursive filter in a 2-step process resulting in a dynamic tomographic display of arterial opacification. Theory and results of initial animal [dog] studies are presented.