Meeting Banner
Abstract #4151

A New Cascade-Regularized Spatial Encoding Technique Using Non-Linear Field Disturbance of Susceptibility Markers

Hirad Karimi1, William Dominguez-Viqueira2, Charles H. Cunningham1, 2

1Dept. of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada; 2Imaging Research, Sunnybrook Research Institue, Toronto, Ontario, Canada

Conventional linear gradient fields generated using gradient coils usually perform spatial encoding in MRI. These coils are stationary relative to any physiological movements and this ultimately limits the spatial resolution. Some applications such as intravascular MR imaging (iMRI) could benefit from the high-resolution images that could result from new approaches. Here, a new encoding technique that allows encoding fields to move with physiological structures is investigated. The method uses only the field perturbations emanating from markers with different susceptibilities as the encoding fields. (The gradient coils on scanner are not used). Simulations and phantom studies were conducted to further validate the result.

Abstract PDF E-Poster Video

Keywords

accuracy acquiring acquisition allow allows applications artifact assigned assumed blue build cascade catheter characterize coils completely compute computed computing conditioned configuration contrast correction correlate decoding degrade degree depicts dept described device diamagnetic diameter disturbance elements emanating encodes encoding equal equation equivalent equivalently every excitation exposed fact field fields flowchart form frequencies funding generated grad gradient graphite hard improve improved in vivo institute introduced inverse investigated like limits linear markers matrix medical medium minimize moved nature novel paramagnetic perturb perturbation perturbations phantom phantoms phys physiological pixel poor position previously process project proposed prototype pseudo pulse pulsed qualitatively read real reality reconstruct reduce reduced reed regularization regularized relationship resolution response resultant rotate rotating rotation rows samples scaled scanner sign solving somewhat space spaces spatial steps structures studies taking transform true truncated usually validate validation vary vector vicinity view visible water window