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We describe the design and construction of a laser-polarized 129 Xe production and delivery system that is used in our in vitro and in vivo magnetic resonance imaging ͑MRI͒ experiments. The entire apparatus including lasers and optics, rapidly actuated valves, heating and cooling, and transport tubing lies in the high magnetic field environment of a 2 T MRI magnet. With approximately 7.5% 129 Xe polarization, 157 cc atm of xenon gas is produced and stored as xenon ice every 5 min. Largedoi:10.1063/1.1149622 fatcat:6jcc4rczyvdmbapa5pifsjjprm