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Abstract #1834

Passive Magnetic Resonance Catheter Tracking with Spatial Wavelet and Temporal Constraints

M. Ethan MacDonald1, 2, R. Marc Lebel, 23, Richard Frayne1, 2

1Biomedical Engineering, University of Calgary, Calgary, AB, Canada; 2Radiology and Clinical Neurosciences, University of Calgary, Seaman Family MR Research Centre, Foothills Medical Centre, Calgary, AB, Canada; 3Applied Science Laboratory, GE Healthcare, Calgary, AB, Canada

In this work we demonstrate L1 constrained reconstruction of a variable density under sampled series, a similar method has been demonstrated for dynamic susceptibility contrast bolus chase imaging. Using the positive contrast of gadolinium in an endovascular catheter we show 3D catheter tracking with high temporal (4.7 Hz) and spatial resolution (64x64x16 acquisition matrix). An acceleration rate of 12.2x is achieved with the constrained reconstruction while maintaining good catheter conspicuity. Maximum intensity projections and 3D iso surfaces are used for rendering catheter images.

Keywords

ability able absence accelerate acceleration achievable acquisition active actively advantage advantages agent allowing aortic applicability applied approaches arch biomedical blurring captured catheter cavity clear clinical collected compressed computational conjugate constrained constraints contrast cost coverage demonstrating denotes density depiction desired detection device discovery domain dynamic effective either electrical enabling encode engineering enhance enhanced evidence example family finite foothills frame freeze full fully function gadolinium general generated gradient green highly historically illustrates initial inside intensity ionizing iterations iteratively laboratory latency limited limiting limits long matrix measured medical minimize minimizing model modern motion much nonetheless norm operator orientations outer outlined overlay passage passive passively phantom physiological polyethylene poor probability projection promoting prospectively quick radiation radiology readily real reason reconstructed reconstruction reduce rendering required resolution sample sampling scanner scheme science seaman sensing several slice soft sparsity spatial strategies suggests superimposed superior systems temporal temporally thoracic tissue toolkit tracking trajectory transparent variation visualization volume wavelet withdrawn