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- W1766882771 abstract "Nuclear magnetic resonance and imaging (NMR/MRI) of optically pumped (OP) hyperpolarized <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$^{3}{hbox {He}}$</tex></formula> were studied by using a high- <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>${hbox {T}}_{rm c}$</tex></formula> SQUID magnetometer device in microtesla magnetic fields. The OP cell was filled with a few milligrams of Rb metal, 0.0798 bar <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>${hbox {N}}_{2}$</tex></formula> gas and 0.705 bar <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>$^{3}{hbox {He}}$</tex></formula> gas. The <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>$^{3}{hbox {He}}$</tex></formula> cell had been hyperpolarized at an optical pumping system for 5 <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$sim$</tex> </formula> 6 hours first; then it was moved to the SQUID-detected nuclear magnetic resonance and imaging system to measure. An appropriate <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>${rm B}_{1}$</tex></formula> pulse level and time duration generated a 5 <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$^{circ}$</tex> </formula> low flip angle of polarization. The free induction decay NMR signals were measured. The spin-lattice relaxation time <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>$({hbox {T}}_{1})$</tex></formula> of <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>$^{3}{hbox {He}}$</tex></formula> was 4.7 hours. We improved the line width of NMR spectrum to 0.8 Hz by compensating the inhomogeneous gradient field of environment. The filtered back projection image of hyperpolarized <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex Notation=TeX>$^{3}{hbox {He}}$</tex></formula> could show a clear image in one shot. The SQUID-detected NMR/MRI would be a great interest for biological imaging." @default.
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- W1766882771 date "2011-06-01" @default.
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- W1766882771 title "Magnetic Resonance Imaging of Hyperpolarized $^{3}{hbox {He}}$ Detected With a High-${hbox {T}}_{rm c}$ SQUID in Microtesla Magnetic Field at Laboratory Environment Fields" @default.
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