title: Spatially different, real-time temporal filtering and dose reduction for dynamic image guidance during neurovascular interventions.
abstract: Fluoroscopic systems have excellent temporal resolution, but are relatively noisy. In this paper we present a recursive temporal filter with different weights (lag) for different user selected regions of interest (ROI) to assist the neurointerventionalist during an image guided catheter procedure. The filter has been implemented on a Graphics Processor (GPU), enabling its usage for fast frame rates such as during fluoroscopy. We first demonstrate the use of this GPU-implemented rapid temporal filtering technique during an endovascular image guided intervention with normal fluoroscopy. Next we demonstrate its use in combination with ROI fluoroscopy where the exposure is substantially reduced in the peripheral region outside the ROI, which is then software-matched in brightness and filtered using the differential temporal filter. This enables patient dose savings along with improved image quality.
authors.affiliation: Electrical Engineering Department, and Toshiba Stroke Research Center at University at Buffalo, The State University of New York, Buffalo, NY 14260-1920, USA. ss438@buffalo.edu
authors.forename: S N Swetadri
authors.initials: SN
authors.lastname: Vasan
authors.forename: P
authors.initials: P
authors.lastname: Sharma
authors.forename: C N
authors.initials: CN
authors.lastname: Ionita
authors.forename: A H
authors.initials: AH
authors.lastname: Titus
authors.forename: A N
authors.initials: AN
authors.lastname: Cartwright
authors.forename: D R
authors.initials: DR
authors.lastname: Bednarek
authors.forename: S
authors.initials: S
authors.lastname: Rudin
mesh_terms: D000465:Algorithms; D000783:Aneurysm / Q000601:surgery*; D003196:Computer Graphics; D003198:Computer Simulation; D003199:Computer Systems; D004867:Equipment Design; D005471:Fluoroscopy / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D015233:Models, Statistical; D009493:Neurosurgery / Q000295:instrumentation* / Q000379:methods*; D012984:Software; D015607:Stents; D013997:Time Factors; D014584:User-Computer Interface; D014965:X-Rays