title: Undersampled projection reconstruction for active catheter imaging with adaptable temporal resolution and catheter-only views.
abstract: In this study undersampled projection reconstruction (PR) was used for rapid catheter imaging in the heart, employing steady-state free precession (SSFP) contrast. Active catheters and phased-array coils were used for combined imaging of anatomy and catheter position in swine. Real-time imaging of catheter position was performed with relatively high spatial and temporal resolution, providing 2 x 2 x 8 mm spatial resolution and four to eight frames per second. Two interactive features were introduced. The number of projections (Np) was adjusted interactively to trade off imaging speed and artifact reduction, allowing acquisition of high-quality or high-frame-rate images. Thin-slice imaging was performed, with interactive requests for thick-slab projection images of the signal received solely from the active catheter. Briefly toggling on catheter-only projection images was valuable for verifying that the catheter tip was contained within the selected slice, or for locating the catheter when part of it was outside the selected slice.
authors.affiliation: Laboratory of Cardiac Energetics, National Institutes of Health, Bethesda, Maryland 20892-0161, USA. petersd@nih.gov
authors.forename: Dana C
authors.initials: DC
authors.lastname: Peters
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Lederman
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Dick
authors.forename: Venkatesh K
authors.initials: VK
authors.lastname: Raman
authors.forename: Michael A
authors.initials: MA
authors.lastname: Guttman
authors.forename: J Andrew
authors.initials: JA
authors.lastname: Derbyshire
authors.forename: Elliot R
authors.initials: ER
authors.lastname: McVeigh
mesh_terms: D000818:Animals; D001011:Aorta / Q000033:anatomy & histology; D006328:Cardiac Catheterization; D003287:Contrast Media / Q000008:administration & dosage; D005682:Gadolinium; D006352:Heart Ventricles / Q000033:anatomy & histology; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007267:Injections; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009206:Myocardium; D013552:Swine
chemical_list: D003287:Contrast Media; D005682:Gadolinium