title: Dynamic tomographic digital subtraction angiography using temporal filtration.
abstract: A variation of temporal recursive filtering for intravenous and intra-arterial digital subtraction angiography (DSA) is described. It results in a dynamic tomographic DSA display that may improve intravenous 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 one revolution each 1.5 seconds. The video output was processed by the recursive filter in a two-step process resulting in a dynamic tomographic display of arterial opacification. Theory and results of initial animal studies are presented.
mesh_terms: D000792:Angiography / Q000379:methods*; D000818:Animals; D004285:Dogs; D004338:Drug Combinations; D005374:Filtration; D007482:Iothalamate Meglumine; D007483:Iothalamic Acid; D013382:Subtraction Technique / Q000295:instrumentation; D014056:Tomography, X-Ray / Q000295:instrumentation*
chemical_list: D004338:Drug Combinations; D007483:Iothalamic Acid; C004233:Vascoray; D007482:Iothalamate Meglumine