title: Nuclear magnetic resonance imaging of airways in humans with use of hyperpolarized 3He.
abstract: The nuclear spin polarization of noble gases can be enhanced strongly by laser optical pumping followed by electron-nuclear polarization transfer. Direct optical pumping of metastable 3He atoms has been shown to produce enormous polarization on the order of 0.4-0.6. This is about 10(5) times larger than the polarization of water protons at thermal equilibrium used in conventional MRI. We demonstrate that hyperpolarized 3He gas can be applied to nuclear magnetic resonance imaging of organs with air-filled spaces in humans. In vivo 3He MR experiments were performed in a whole-body MR scanner with a superconducting magnet ramped down to 0.8 T. Anatomical details of the upper respiratory tract and of the lungs of a volunteer were visualized with the FLASH technique demonstrating the potential of the method for fast imaging of airways in the human body and for pulmonary ventilation studies.
authors.affiliation: Forschungsschwerpunkt Radiologische Diagnostik und Therapie, Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Bachert
authors.forename: L R
authors.initials: LR
authors.lastname: Schad
authors.forename: M
authors.initials: M
authors.lastname: Bock
authors.forename: M V
authors.initials: MV
authors.lastname: Knopp
authors.forename: M
authors.initials: M
authors.lastname: Ebert
authors.forename: T
authors.initials: T
authors.lastname: Grossmann
authors.forename: W
authors.initials: W
authors.lastname: Heil
authors.forename: D
authors.initials: D
authors.lastname: Hofmann
authors.forename: R
authors.initials: R
authors.lastname: Surkau
authors.forename: E W
authors.initials: EW
authors.lastname: Otten
mesh_terms: D000328:Adult; D006371:Helium; D006801:Humans; D007554:Isotopes; D008279:Magnetic Resonance Imaging / Q000379:methods*; D012119:Respiration / Q000502:physiology; D012143:Respiratory Physiological Phenomena
chemical_list: D007554:Isotopes; D006371:Helium