Digital angiography: current status.
Digital angiography depends upon computer recording and manipulation of the radiographic image rather than the use of film. We use a small focal spot x-ray tube, a cesium iodide image intensifier and the image is recorded on a 512 X 512 matrix at 1.2 frames per second. Subtraction angiograms have been obtained in 250 patients and 86% of the results were graded as either good or excellent in head and neck examinations. There is however a small proportion of patients in whom results are unsatisfactory and in whom this fact can be attributed most often to cardiac failure. The advantages of digital intravenous and intra-arterial subtraction angiography have been evaluated and amount to improved patient safety, high system contrast and favourable cost effectiveness; these outweigh the limitations of the restricted field of view and the relatively low resolution of the image in comparison with conventional arteriography.
D000368:Aged; D000792:Angiography / Q000295:instrumentation / Q000379:methods*; D001932:Brain Neoplasms / Q000000981:diagnostic imaging; D002341:Carotid Artery Thrombosis / Q000000981:diagnostic imaging; D002343:Carotid Artery, Internal; D002533:Cerebral Angiography / Q000379:methods; D003201:Computers; D005260:Female; D006801:Humans; D006977:Hypertension, Renal / Q000000981:diagnostic imaging; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging; D013382:Subtraction Technique