| lung ventilation agents | <radiology> Xe-133, most commonly used, Xe-127, t = 36.4 days; photons @ 172, 203, 375 keV, can image V after Q, Kr-81m, very expensive, t = 13 sec; photon 190 keV, can repeat V in each projection, Tc-99m DTPA aerosol, can image V in mult. Projections, image Q after V, 1 mCi most likely to be 50-75 mrad to lung, V/Q imaging (12 Dec 1998) |
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| lung volume measurements | Measurement of the amount of air that the lungs may contain at various points in the respiratory cycle. (12 Dec 1998) |
| lymphangitic lung metastases | <radiology> Usually adenocarcinoma, breast, lung, upper GI tract (stomach, pancreas) (12 Dec 1998) |