Increase of NMR/MIR signals under ultra-low B fields with hyperpolarized Xe using 1W CW single-frequency Ti:Sapphire laser

摘要

In recent years, hyperpolarized noble gas MRI attracts attention. Spin-exchange optical pumping (SEOP) is often usedfor hyperpolarizing nuclear spin of noble gas. Although there are many reports on rare gas hyperpolarization devices usingSEOP, most of them use high power CW lasers exceeding 10 W. Large output laser has high risk of exposure, high costand high energy consumption. However, in SEOP, only a very small amount coincident with D1 line works and almost allother power is abandoned. Therefore, in this study, we development that Xe hyperpolarizing system using narrow linewidthTi:Sapphire laser and demonstrated that this system can pump with lower pawer by tuning wavelength to D1 line. As aresult, we show that system using narrow linewidth laser can get equally or lager signal augment ratio by 1/45 times lowerirradiation power than conventional system.