title: Work in progress: hybrid temporal-energy subtraction in digital fluoroscopy.
abstract: Initial clinical results using a digital fluoroscopic implementation of the combined time-energy ("hybrid") subtraction technique are described, with emphasis on carotid and renal imaging. Where patient motion artifacts are due to soft-tissue motion alone, hybrid subtraction can remove them. Due to the need for a finite separation time between high- and low-energy pairs, however, the present implementation of the hybrid technique is not completely immune to soft-tissue motion. The intrinsic signal-to-noise ratio of hybrid imaging is less than that of conventional temporal subtraction. However, since the low-energy temporal subtraction images are included in the hybrid data set, the diagnostic quality of the examination is not compromised.
mesh_terms: D000703:Analog-Digital Conversion; D000792:Angiography / Q000379:methods*; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D003201:Computers; D005471:Fluoroscopy / Q000379:methods; D006801:Humans; D013382:Subtraction Technique / Q000295:instrumentation*