title: Local T2 measurement employing longitudinal Hadamard encoding and adiabatic inversion pulses in porous media.
abstract: Band selective adiabatic inversion radio frequency pulses were employed for multi-slice T2 distribution measurements in porous media samples. Multi-slice T2 measurement employing longitudinal Hadamard encoding has an inherent sensitivity advantage over slice-by-slice local T2 measurements. The slice selection process is rendered largely immune to B1 variation by employing hyperbolic secant adiabatic inversion pulses, which simultaneously invert spins in several well-defined slices. While Hadamard encoding is well established for local spectroscopy, the current work is the first use of Hadamard encoding for local T2 measurement.
authors.affiliation: UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address: sarah.vashaee@unb.ca.
authors.forename: S
authors.initials: S
authors.lastname: Vashaee
authors.affiliation: UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address: bnewling@unb.ca.
authors.forename: B
authors.initials: B
authors.lastname: Newling
authors.affiliation: UNB MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address: bjb@unb.ca.
authors.forename: B J
authors.initials: BJ
authors.lastname: Balcom
keywords: Adiabatic inversion; CPMG; Longitudinal Hadamard encoding; Magnetic resonance; Porous media; Sensitivity; T(2) mapping