T2 distribution mapping profiles with phase-encode MRI

Petrov, Oleg V.; Ersland, Geir; Balcom, Bruce J.

doi:10.1016/j.jmr.2010.12.006

Cited by 58 publications

(41 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[6,7] T 2 mapping SE-SPI commenced with a 90°pulse, followed by a magnetic field gradient pulse and a 180°R F pulse train. The sample magnetization was phase encoded, and the phase maintained for each echo in the spin echo train.…”

Section: K-t Se-spimentioning

confidence: 99%

“…A series of T 2 -weighted profiles can be constructed, and after inverse Laplace transformation of the decay curves for each pixel, a spatially resolved T 2 distribution can be obtained. [6,7] The spatially resolved signal intensity, SI, after the nth echo is given by…”

Section: K-t Se-spimentioning

confidence: 99%

“…Spin echo single point imaging (SE-SPI) MRI measurements generate a series of T 2 -weighted images and, thereby, a spatially resolved T 2 distribution. [5,6] SE-SPI is, however, time consuming because only one k-space point is acquired for each RF excitation, and there is a 5T 1 relaxation delay for magnetization recovery between each gradient step. [5][6][7] In previous work, displacing phase injection was suspended to avoid fluid content change during lengthy MRI measurements.…”

Section: Introductionmentioning

confidence: 99%

“…[5,6] SE-SPI is, however, time consuming because only one k-space point is acquired for each RF excitation, and there is a 5T 1 relaxation delay for magnetization recovery between each gradient step. [5][6][7] In previous work, displacing phase injection was suspended to avoid fluid content change during lengthy MRI measurements. [8,9] However, the oil and water pore scale distribution may change when fluid injection is suspended.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Monitoring oil displacement processes with k‐t accelerated spin echo SPI

Xiao

Romero‐Zerón

et al. 2015

Magnetic Reson in Chemistry

Self Cite

View full text Add to dashboard Cite

Magnetic resonance imaging (MRI) is a robust tool to monitor oil displacement processes in porous media. Conventional MRI measurement times can be lengthy, which hinders monitoring time-dependent displacements. Knowledge of the oil and water microscopic distribution is important because their pore scale behavior reflects the oil trapping mechanisms. The oil and water pore scale distribution is reflected in the magnetic resonance T2 signal lifetime distribution. In this work, a pure phase-encoding MRI technique, spin echo SPI (SE-SPI), was employed to monitor oil displacement during water flooding and polymer flooding. A k-t acceleration method, with low-rank matrix completion, was employed to improve the temporal resolution of the SE-SPI MRI measurements. Comparison to conventional SE-SPI T2 mapping measurements revealed that the k-t accelerated measurement was more sensitive and provided higher-quality results. It was demonstrated that the k-t acceleration decreased the average measurement time from 66.7 to 20.3 min in this work. A perfluorinated oil, containing no (1) H, and H2 O brine were employed to distinguish oil and water phases in model flooding experiments. High-quality 1D water saturation profiles were acquired from the k-t accelerated SE-SPI measurements. Spatially and temporally resolved T2 distributions were extracted from the profile data. The shift in the (1) H T2 distribution of water in the pore space to longer lifetimes during water flooding and polymer flooding is consistent with increased water content in the pore space. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Section: K-t Se-spimentioning

confidence: 99%

Section: K-t Se-spimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monitoring oil displacement processes with k‐t accelerated spin echo SPI

Xiao

Romero‐Zerón

et al. 2015

Magnetic Reson in Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…Pure phase encode techniques are robust in their ability to generate true fluid content images and relaxation mappings in porous media [14][15][16][17]. Li measured 1D spatially resolved T 2 distributions with separate phase encoding of each echo in a multi-echo CPMG pulse train [15].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional T2 distribution mapping in rock core plugs with optimal k-space sampling

Xiao

Balcom

2012

Journal of Magnetic Resonance

Self Cite

View full text Add to dashboard Cite

Measuring miscible fluid displacement in porous media with magnetic resonance imaging

Muir

Petrov

Romanenko

et al. 2014

Water Resources Research

Self Cite

View full text Add to dashboard Cite

The development of new quantitative magnetic resonance imaging (MRI) technologies opennew opportunities for measurements of mass transport in porous media. The current work examines a simple miscible displacement process of H 2 O and D 2 O in porous media samples. Laboratory measurements of dispersion in porous media traditionally monitor the effluent intensity of an injected tracer. We employ MRI to obtain quantitative water saturation profiles, and to measure dispersion in rock core plugs. The saturation profiles are modeled with PHREEQC, a fluid transport modeling program. We demonstrate how independent magnetic resonance measurements can be employed to estimate three important input parameters for PHREEQC, mobile porosity, immobile porosity, and dispersivity. Bulk Carr Purcell Meiboom Gill (CPMG) T 2 distribution measurements were undertaken to estimate mobile and immobile porosity. Bulk alternatingpulsed-gradient-stimulated-echo (APGSTE) measurements were undertaken to measure dispersivity. The imaging method employed, T 2 mapping Spin Echo Single Point Imaging (SE-SPI), also provides information about the pore size distributions in the rock cores, and how the fluid occupancy of the pores changes during the displacement process.

show abstract

T2 distribution mapping profiles with phase-encode MRI

Cited by 58 publications

References 26 publications

Monitoring oil displacement processes with k‐t accelerated spin echo SPI

Monitoring oil displacement processes with k‐t accelerated spin echo SPI

Two-dimensional T2 distribution mapping in rock core plugs with optimal k-space sampling

Measuring miscible fluid displacement in porous media with magnetic resonance imaging

Contact Info

Product

Resources

About