Chest radiograph - Abnormalities. 1  A pulmonary nodule is a discrete opacity in the lung which may be caused by... 2  Neoplasm: benign or malignant. 3  Granuloma: tuberculosis. 4  Infection: roundish pneumonia. 5  Vascular: infarct, varix, granulomatosis with polyangiitis, rheumatoid arthritis.
Helium is used for purposes that require some of its unique properties: its low density, low solubility, and high thermal conductivity. 7,000 tons, or 22%, of the total helium used involves the cooling of superconducting magnets in medical magnetic resonance imaging (MRI) scanners.
Helium is the second-most abundant element in the universe, after hydrogen. Most helium. is recovered from natural gas, so it is not a renewable resource. The demand for helium is. increasing. Many industries use it, including science and healthcare, metal fabrication, electronics and aviation. Uses and Benefits. Helium is a multipurpose molecule with many.