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pubmed-article:3546627pubmed:abstractTextAerosols of 99mTc diethylenetriaminepentaacetic acid ([99mTc]DTPA) used for measuring lung permeability and lung ventilation require a radioaerosol delivery system to produce an aerosol with reproducible size and radiochemical purity. To test how well nebulizers meet this requirement, radiochemical purity of aerosols produced with a jet and an ultrasonic nebulizer was evaluated. The activity median aerodynamic diameter (AMAD) and geometric standard deviation (sigma g) of radioaerosols were 0.46 micron (sigma g = 1.6) for the jet nebulizer and 0.70 micron (sigma g = 1.7) for the ultrasonic nebulizer. Paper and liquid chromatographic assays were obtained on the [99mTc]DTPA aerosol solute produced with each nebulizer. The results of these tests showed major differences in radiochemical purity. Aerosols produced in the jet nebulizer consistently showed greater than 90% of the radioactivity bound to the DTPA ligand whereas aerosols produced in the ultrasonic nebulizer showed less than 10% of the radioactivity bound to DTPA. The results support the need to test radiochemical purity of aerosols before using an aerosol nebulizer for pulmonary imaging and clearance studies.lld:pubmed
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pubmed-article:3546627pubmed:pagination378-82lld:pubmed
pubmed-article:3546627pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:3546627pubmed:articleTitleChemical breakdown of technetium-99m DTPA during nebulization.lld:pubmed
pubmed-article:3546627pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:3546627pubmed:publicationTypeComparative Studylld:pubmed
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