Adiabatic half-passage pulses for measuring the polarization of highly non-equilibrium spin-systems

TY - JOUR

T1 - Adiabatic half-passage pulses for measuring the polarization of highly non-equilibrium spin-systems

AU - Oregioni, A

AU - Eykyn, Thomas

AU - Hosny, N

AU - Payne, GS

AU - Leach, MO

PY - 2005/10/3

Y1 - 2005/10/3

N2 - We consider the use of adiabatic half-passage pulses (AHP) for the uniform excitation of highly non-equilibrium spin-systems such as spin-exchange optically pumped (SEOP) Xe-129. The method simplifies a number of problems that are encountered for these systems, notably the non-renewable nature of the magnetization, the need for accurate pulse calibration and the influence of radiation damping. This is shown to be a straightforward method for achieving the maximum obtainable signal and thereby for measuring the degree of polarization on a 1.5 T clinical MRI scanner

AB - We consider the use of adiabatic half-passage pulses (AHP) for the uniform excitation of highly non-equilibrium spin-systems such as spin-exchange optically pumped (SEOP) Xe-129. The method simplifies a number of problems that are encountered for these systems, notably the non-renewable nature of the magnetization, the need for accurate pulse calibration and the influence of radiation damping. This is shown to be a straightforward method for achieving the maximum obtainable signal and thereby for measuring the degree of polarization on a 1.5 T clinical MRI scanner

KW - MAGNETIC-RESONANCE

KW - HYPERPOLARIZED XENON

KW - NMR

KW - XE-129

KW - INHOMOGENEITY

KW - SPECTROSCOPY

KW - RELAXATION

KW - INVERSION

KW - OFFSETS

KW - BLOOD

U2 - 10.1016/j.cplett.2005.08.045

DO - 10.1016/j.cplett.2005.08.045

M3 - Article

VL - 414

SP - 102

EP - 106

JO - CHEMICAL PHYSICS LETTERS

JF - CHEMICAL PHYSICS LETTERS

IS - 1-3

ER -