title: Generation of 4D access corridors from real-time multislice MRI for guiding transapical aortic valvuloplasties.
abstract: Real-time image-guided cardiac procedures (manual or robot-assisted) are emerging due to potential improvement in patient management and reduction in the overall cost. These minimally invasive procedures require both real-time visualization and guidance for maneuvering an interventional tool safely inside the dynamic environment of a heart. In this work, we propose an approach to generate dynamic 4D access corridors from the apex to the aortic annulus for performing real-time MRI guided transapical valvuloplasties. Ultrafast MR images (collected every 49.3 ms) are processed on-the-fly using projections to extract a conservative dynamic trace in form of a three-dimensional access corridor. Our experimental results show that the reconstructed corridors can be refreshed with a delay of less than 0.5ms to reflect the changes inside the left ventricle caused by breathing motion and the heartbeat.
authors: Computer Graphics and Interactive Media Lab, University of Houston, Houston, TX 77004, USA. nvnavkar@cs.uh.edu
authors: N V
authors: NV
authors: Navkar
authors: E
authors: E
authors: Yeniaras
authors: D J
authors: DJ
authors: Shah
authors: N V
authors: NV
authors: Tsekos
authors: Z
authors: Z
authors: Deng
mesh_terms: D000465:Algorithms; D001021:Aortic Valve / Q000601:surgery*; D006348:Cardiac Surgical Procedures / Q000295:instrumentation* / Q000379:methods*; D002404:Catheterization / Q000379:methods*; D003198:Computer Simulation; D004699:Endocardium / Q000473:pathology; D006321:Heart / Q000502:physiology; D006352:Heart Ventricles / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009038:Motion; D015203:Reproducibility of Results; D012119:Respiration; D012984:Software