Gradient echo imaging of flowing hyperpolarized nuclei: theory and phantom studies on 129Xe dissolved in ethanol

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Gradient echo imaging of flowing hyperpolarized nuclei : theory and phantom studies on 129Xe dissolved in ethanol. / Johansson, Edvin; Svensson, Jonas; Månsson, S; Petersson, J S; Olsson, L E; Golman, K; Ståhlberg, F.

I: Journal of Magnetic Resonance, Vol. 159, Nr. 1, 11.2002, s. 68-75.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Gradient echo imaging of flowing hyperpolarized nuclei

T2 - theory and phantom studies on 129Xe dissolved in ethanol

AU - Johansson, Edvin

AU - Svensson, Jonas

AU - Månsson, S

AU - Petersson, J S

AU - Olsson, L E

AU - Golman, K

AU - Ståhlberg, F

PY - 2002/11

Y1 - 2002/11

N2 - The influence of flip angle and flow velocity on the signal intensity achieved when imaging a hyperpolarized substance with a spoiled gradient echo sequence was investigated. The study was performed both theoretically and experimentally using hyperpolarized xenon dissolved in ethanol. Analytical expressions regarding the optimal flip angle with respect to signal and the corresponding signal level are presented and comparisons with thermally polarized substances are made. Both experimentally and theoretically, the optimal flip angle was found to increase with increasing flow velocity. Numerical calculations showed that the velocity dependence of the signal differs between the cases of hyperpolarized and thermally polarized substances.

AB - The influence of flip angle and flow velocity on the signal intensity achieved when imaging a hyperpolarized substance with a spoiled gradient echo sequence was investigated. The study was performed both theoretically and experimentally using hyperpolarized xenon dissolved in ethanol. Analytical expressions regarding the optimal flip angle with respect to signal and the corresponding signal level are presented and comparisons with thermally polarized substances are made. Both experimentally and theoretically, the optimal flip angle was found to increase with increasing flow velocity. Numerical calculations showed that the velocity dependence of the signal differs between the cases of hyperpolarized and thermally polarized substances.

KW - Echo-Planar Imaging

KW - Ethanol

KW - Magnetic Resonance Angiography

KW - Phantoms, Imaging

KW - Xenon Isotopes

U2 - 10.1016/S1090-7807(02)00117-9

DO - 10.1016/S1090-7807(02)00117-9

M3 - Article

C2 - 12468305

VL - 159

SP - 68

EP - 75

JO - Journal of Magnetic Resonance

JF - Journal of Magnetic Resonance

SN - 1096-0856

IS - 1

ER -