Top: lung images of ventilation scan (left) at steady state during
dynamic breathing of 133Xe and aerosol scan (right) immediately after depostion
of 99mTc-labeled sulfur colloid in an anesthetized sheep model.
Animal was imaged by gamma camera in a supine position from ventral aspect.
Left side of field, lung base (limited by diaphragm); top field, right lung
(limited by chest wall). Colors represent radioisotopic-counting rates,
i.e., blue > yellow > red. Drawn-in lines circumscribe regions of analysis.
Bottom: same as in top but from a different sheep. No lines
demarcate regions of analysis.