Fred L. Fontaine

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Commercial receivers used for parallel MR imaging often present researchers with hurdles such as high cost-per-channel, low scalability for multiple coils and non-accessibility to intermediate data for research. A novel low-cost multichannel digital receiver for use with MR scanners has been developed to alleviate these concerns. MR signals from up to 16(More)
—Parallel MRI acquisitions are generally reconstructed into images off-line, on PCs and computer clusters. Here, we present an innovative single-FPGA engine that performs real-time 2D-FFT image reconstruction from arrays of up to 16 coils. Partial reconfiguration enables rapid switching of FPGA modules for maximal flexibility and lower hardware cost. If the(More)
guidance during the preparation of this thesis. Mr. Henry Massalin supplied the GIF decoder used, answered many questions, and in general was a good influence on me. Dr. Leonid Vulakh helped with some of the theory. I would also like to thank the Cooper Union librarians for tracking books down for me and also furnishing many of the pictures used in the(More)
Acknowledgments I would like to thank my advisor, Dr. Fred Fontaine, for his guidance and patience throughout this process. Without his teachings I would not be where I am today. I would also like to thank the rest of the faculty, as well as my friends and peers at The of whom gave their time to listen patiently to my ideas and help me improve this thesis(More)
In many imaging applications, including sensor arrays, MRI and CT,data is often sampled on non-rectangular point sets with non-uniform density. Moreover, in image and video processing, a mix of non-rectangular sampling structures naturally arise. Multirate processing typically utilizes a normalized integer indexing scheme, which masks the true physical(More)
Common MRI sampling patterns in k-space, such as spiral trajectories, have nonuniform density and do not lie on a cartesian grid. This paper illustrates that the sampled data on a spiral trajectory can be e¢ ciently regridded onto a pseudo-hexagonal lattice using a nearest neighbor regridding algorithm. Also, it is shown that separable FFT using cartesian(More)