Metastability exchange optical pumping of 3He at high pressure and high magnetic field for medical applications

Nikiel, Anna; Pałasz, T.; Suchánek, M.; Abboud, Maher; Sinatra, Alice; Olejniczak, Zbigniew; Dohnalik, T.; Tastevin, Geneviève; Nacher, Pierre-Jean

doi:10.1140/epjst/e2007-00138-3

Cited by 13 publications

(35 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another striking feature is that high-field MEOP, which operates quite efficiently (M eq =0.56 with 0.5 W OP at 1.5 T in the same cell) and with reduced decay rates (here, Γ decay =0.67×10 −3 s −1 ), also gives rise to a strong OP-light-enhanced relaxation. This is currently being investigated at still higher pressures and magnetic field in Cracow [14,15,36].…”

Section: Steady-state Polarisation and Ground State Nuclear Relaxationmentioning

confidence: 99%

See 1 more Smart Citation

Fundamentals of metastability exchange optical pumping in helium

Batz

Nacher

Tastevin

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Section: Steady-state Polarisation and Ground State Nuclear Relaxationmentioning

confidence: 99%

“…imaging (MRI) system [13,14], and up to 4.7 T [15]. Operating at higher pressures would make subsequent compression significantly easier to perform.…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of metastability exchange optical pumping in helium

Batz

Nacher

Tastevin

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

“…This is the case for several applications including lung MRI, and it introduces demanding requirements on the gas handling and compressing devices. However, it was recently shown that the range of operating pressures can be extended to several tens of mbar by performing MEOP in a high magnetic field, such as the 1.5 T field of an MRI system [54,55], which could make subsequent compression less difficult to perform.…”

Section: Hyperpolarization Of Noble Gasesmentioning

confidence: 99%

Magnetic Resonance Imaging: From Spin Physics to Medical Diagnosis

Nacher

2009

The Spin

View full text Add to dashboard Cite

Abstract. Two rather similar historical evolutions are evoked, each one originating in fundamental spin studies by physicists, and ending as magnetic resonance imaging (MRI), a set of invaluable tools for clinical diagnosis in the hands of medical doctors. The first one starts with the early work on nuclear magnetic resonance, the founding stone of the usual proton-based MRI, of which the basic principles are described. The second one starts with the optical pumping developments made to study the effects of spin polarization in various fundamental problems. Its unexpected outcome is a unique imaging modality, also based on MRI, for the study of lung physiology and pathologies.

show abstract

“…Spectacular improvements of the steady-state nuclear polarization have been reported at 1.5 T for gas pressures ranging from 8 to 67 mbar [5,16], as well as at 32 and 67 mbar for field strengths ranging from 0.45 to 2 T [13]. These improvements may be mostly due to reduced losses of nuclear orientation by relaxation since the operation at high field has a limited negative impact on OP and ME.…”

Section: Introductionmentioning

confidence: 99%

“…Following the first demonstrations of improved MEOP efficiency at 0.1 T [4,10,11] and 0.6 T [12], a systematic experimental investigation of processes relevant for MEOP in non standard conditions (high field, high pressure, and/or high laser power) has been undertaken [4,5,13,14] and a thorough study of both ME and OP processes at high field has been carried out [15]. Spectacular improvements of the steady-state nuclear polarization have been reported at 1.5 T for gas pressures ranging from 8 to 67 mbar [5,16], as well as at 32 and 67 mbar for field strengths ranging from 0.45 to 2 T [13].…”

Section: Introductionmentioning

confidence: 99%

Metastability exchange optical pumping of 3He gas up to hundreds of millibars at 4.7 Tesla

et al. 2013

View full text Add to dashboard Cite

Abstract. Metastability exchange optical pumping (MEOP) is experimentally investigated in3 He at 4.7 T, at room temperature and for gas pressures ranging from 1 to 267 mbar. The 2 3 S-2 3 P transition at 1083 nm is used for optical pumping and for detection of the laser-induced orientation of 3 He atoms in the rf discharge plasma. The collisional broadening rate is measured (12.0 ± 0.4 MHz mbar −1 FHWM) and taken into account for accurate absorption-based measurements of both nuclear polarization in the ground state and atom number density in the metastable 2 3 S state. The results lay the ground for a comprehensive assessment of the efficiency of MEOP, by comparison with achievements at lower field (1 mT-2 T) over an extended range of operating conditions. Stronger hyperfine decoupling in the optically pumped 2 3 S state is observed to systematically lead to slower build-up of 3 He orientation in the ground state, as expected. The nuclear polarizations obtained at 4.7 T still decrease at high pressure but in a less dramatic way than observed at 2 T in the same sealed glass cells. To date, thanks to the linear increase in gas density, they correspond to the highest nuclear magnetizations achieved by MEOP in pure 3 He gas. The improved efficiency puts less demanding requirements for compression stages in polarized gas production systems and makes high-field MEOP particularly attractive for magnetic resonance imaging of the lungs, for instance.

show abstract

Metastability exchange optical pumping of 3He at high pressure and high magnetic field for medical applications

Cited by 13 publications

References 9 publications

Fundamentals of metastability exchange optical pumping in helium

Fundamentals of metastability exchange optical pumping in helium

Magnetic Resonance Imaging: From Spin Physics to Medical Diagnosis

Metastability exchange optical pumping of 3He gas up to hundreds of millibars at 4.7 Tesla

Contact Info

Product

Resources

About