Showing papers by "Jin Hyung Lee published in 2004"
TL;DR: The results suggest that the activity responsible for the formation of asymmetric dimethylated arginine residues in Sm proteins is either PRMT5 or a protein associated with it in the immunoprecipitated complex.
44 citations
15 Apr 2004
TL;DR: A fast and accurate discrete spiral Fourier transform and its inverse solves the problem of reconstructing an image from MRI data acquired along a spiral k-space trajectory.
Abstract: We present a fast and accurate discrete spiral Fourier transform and its inverse. The inverse solves the problem of reconstructing an image from MRI data acquired along a spiral k-space trajectory. First, we define the spiral FT and its adjoint. These discrete operators allow us to efficiently compute the inverse using fast-converging conjugate gradient methods. Next, we developed a fast approximate spiral FT using the pseudo-polar FFT, to enhance the computational performances and numerical accuracy of the algorithm. Preliminary results demonstrate that the proposed algorithm is more accurate than existing iterative methods that use similar interpolation and grid size.
10 citations
15 Apr 2004
TL;DR: An algorithm that will guide the determination of an optimal sampling pattern based on prior knowledge of the signal of interest is proposed and applications include optimal variable-density k-space trajectory design or reduced phase encoding in 3DFT and spectroscopy.
Abstract: Magnetic resonance imaging (MRI) is often times limited by scan time To reduce scan time, there have been various efforts to reduce the number of sampling points In most cases, this is done by utilizing a priori knowledge of the signal of interest In this paper, we propose an algorithm that will guide the determination of an optimal sampling pattern based on prior knowledge of the signal Applications of this method include optimal variable-density k-space trajectory design or reduced phase encoding in 3DFT and spectroscopy Preliminary results are shown as a proof of concept
3 citations