title: Accelerated 3D catheter visualization from triplanar MR projection images.
abstract: One major obstacle for MR-guided catheterizations is long acquisition times associated with visualizing interventional devices. Therefore, most techniques presented hitherto rely on single-plane imaging to visualize the catheter. Recently, accelerated three-dimensional (3D) imaging based on compressed sensing has been proposed to reduce acquisition times. However, frame rates with this technique remain low, and the 3D reconstruction problem yields a considerable computational load. In X-ray angiography, it is well understood that the shape of interventional devices can be derived in 3D space from a limited number of projection images. In this work, this fact is exploited to develop a method for 3D visualization of active catheters from multiplanar two-dimensional (2D) projection MR images. This is favorable to 3D MRI as the overall number of acquired profiles, and consequently the acquisition time, is reduced. To further reduce measurement times, compressed sensing is employed. Furthermore, a novel single-channel catheter design is presented that combines a solenoidal tip coil in series with a single-loop antenna, enabling simultaneous tip tracking and shape visualization. The tracked tip and catheter properties provide constraints for compressed sensing reconstruction and subsequent 2D/3D curve fitting. The feasibility of the method is demonstrated in phantoms and in an in vivo pig experiment.
authors.affiliation: King's College London, Division of Imaging Sciences, London, UK. carsten.schirra@kcl.ac.uk
authors.forename: Carsten Oliver
authors.initials: CO
authors.lastname: Schirra
authors.forename: Steffen
authors.initials: S
authors.lastname: Weiss
authors.forename: Sascha
authors.initials: S
authors.lastname: Krueger
authors.forename: Denis
authors.initials: D
authors.lastname: Caulfield
authors.forename: Steen F
authors.initials: SF
authors.lastname: Pedersen
authors.forename: Reza
authors.initials: R
authors.lastname: Razavi
authors.forename: Sebastian
authors.initials: S
authors.lastname: Kozerke
authors.forename: Tobias
authors.initials: T
authors.lastname: Schaeffter
mesh_terms: D000818:Animals; D002404:Catheterization / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D013552:Swine