Line, B R A new perspective and old problems. [electronic resource] - Journal of nuclear medicine : official publication, Society of Nuclear Medicine Sep 1981 - 827-30 p. digital Publication Type: Journal Article ISSN: 0161-5505 Subjects--Topical Terms: HumansLung--diagnostic imagingLung Diseases--diagnostic imagingLung Diseases, Obstructive--diagnostic imagingPressurePulmonary CirculationPulmonary Embolism--diagnostic imagingTomography, Emission-ComputedVentilation-Perfusion Ratio