Regional anisotropy of airspace orientation in the lung as assessed with hyperpolarized helium-3 diffusion MRI. - Komlosi P; Altes TA; Qing K; Mooney KE; Miller GW; Mata JF; de Lange EE; Tobias WA; Cates GD Jr; Brookeman JR; Mugler JP 3rd (Journal of magnetic resonance imaging : JMRI, 2015)