摘要
该文以超导量子干涉元件研究光激发氦三极化气体的低磁场磁共振与造影术.使用圆偏极化雷色光将氦三气体极化,超导量子干涉元件磁共振与造影之测量是以磁通耦合方式来进行,超导量子干涉元件是用铋锶钙铜氧高溫超导罐来隔离环境噪音.此方法测得的磁共振信号与影像相较于直接将样品置于杜瓦瓶下方有较高的信噪比,当样品无法靠近感测元件时,此装置具高信噪比特色.磁通耦合方式的超导量子干涉元件低磁场磁共振与造影术及其氦三极化气体的肺部造影在学术与应用上是相当有趣.
A study of nuclear magnetic resonance and imaging （NMR/MRI） of optically pumped hyperpolarized 3He using high-Tc superconducting quantum interference device （SQUID） in microtesla fields was reported.Hyperpolarized 3He was obtained by pumping optical cell containing 3He,N2,4He and a few grams of Rb metal using a circularly polarized laser.In the characterization of 3He the precession spins of 3He were coupled to the SQUID magnetometer by a flux transformer.The SQUID and was designed within a superconducting Bi2Sr2Ca2Cu3Oy vessel to avoid environmental noises.The NMR signal using the flux transformer shows an enhancement in signal-to-noise ratio over that directly measured by the SQUID magnetometer.The SQUID-detected NMR/MRI using hyperpolarized 3He can be of interest for lung imaging in ultralow magnetic fields.
出处
《波谱学杂志》
CAS
CSCD
北大核心
2010年第3期386-395,共10页
Chinese Journal of Magnetic Resonance
基金
National Science Council,Taiwan(NSC98-2752-M-002-003-PAE,98-2112-M-002-010)
