title: Two-dimensional T2 distribution mapping in porous solids with phase encode MRI.
abstract: Two pure phase encode MRI sequences, CPMG-prepared SPRITE and spin-echo SPI with compressed sensing, for two-dimensional (2-D) T2 distribution mapping have been presented. The sequences are 2-D extensions of their 1-D predecessors previously described and are intended for studying processes in porous solids and other samples with short relaxation times whenever 2-D T2 maps are preferable to simple 1-D profiling. The sequences were tested on model samples and natural water-saturated rocks, in a low field MRI instrument. 2-D spin-echo SPI and CPMG-SPRITE demonstrate a similar performance, enabling measurement of T2 down to 1-2 ms. Both experiments are time consuming (up to 2-2.5 h sample dependent). As such, they can be recommended mostly for measurement during steady state conditions or when studying relatively slow dynamic processes (e.g. enhanced oil recovery, cement paste hydration, curing rubber, infiltration of paramagnetic ions).
authors.affiliation: MRI Research Centre, Department of Physics, University of New Brunswick, Fredericton, Canada. opetrov@unb.ca
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Petrov
authors.forename: Bruce J
authors.initials: BJ
authors.lastname: Balcom
mesh_terms: D000465:Algorithms; D005682:Gadolinium; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D016062:Porosity; D012987:Soil
chemical_list: D012987:Soil; D005682:Gadolinium