ventilation agents used in pulmonary scintigraphy

Question Number 1611

Question:
regarding the ventilation agents used in pulmonary scintigraphy

a) the physical half-life of Xenon-133 is about 3 minutes
b) the emitted gamma rays of Xenon-133 have a keV of about 140
c) when using Krypton-81m ventilation can be performed after the perfusion study
d) a Tc-99m DTPA aerosol may be used
e) when using a Carbon dioxide tracer a persistent hot spot indicates a perfusion defect


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