title: Restricted k-space sampling in pure phase encode MRI of rock core plugs.
abstract: In the study of rock core plugs with multidimensional MRI, the samples are of a regular cylindrical shape that yields well defined intensity distributions in reciprocal space. The high intensity k-space points are concentrated in the central region and in specific peripheral regions. A large proportion of the k-space points have signal intensities that are below the noise level. These points can be zero-filled instead of being collected experimentally. k-space sampling patterns that collect regions of high intensity signal while neglecting low intensity regions can be naturally applied to a wide variety of pure phase encoding measurements, such as T2 mapping SESPI, hybrid-SESPI and SPRITE, since all imaging dimensions can be under-sampled. With a shorter acquisition time, as fewer experimental data points are required, the RF and gradient duty cycles are reduced, while the image SNR is improved.
authors: MRI Research Center, Department of Physics, University of New Brunswick, Canada. d.x@unb.ca
authors: Dan
authors: D
authors: Xiao
authors: Bruce J
authors: BJ
authors: Balcom
mesh_terms: D000465:Algorithms; D019015:Geologic Sediments / Q000032:analysis* / Q000145:classification*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D012996:Solutions / Q000032:analysis* / Q000737:chemistry*
chemical_list: D012996:Solutions