in conscious sheep , 2 ml of a solution containing 8 mci of macroaggregates of albumin labeled with technetium-99m ( 99mtc ) and 99mtc-pyrophosphate were instilled under direct vision into the trachea via a fiberoptic bronchoscope , providing an actual deposition on the tracheal epithelium of 1.8 to 2 mci .
C0040578
trachea
C1179002
tracheal