in a woman taking hormonal contraceptives and valdecoxib . (A) After inhalation of 20.1 mCi of Xenon -133 gas, scintigraphic images were obtained in the posterior projection, showing uniform ventilation to lungs. (B) After intravenous injection of 4.1 mCi of Technetium -99m-labeled macroaggregated albumin , scintigraphic images were obtained, shown here