lung ventilation agents

Xe-133
- most commonly used
Xe-127
- t = 36.4 days; photons @ 172, 203, 375 keV
- can image V after Q
Kr-81m
- very expensive
- t = 13 sec; photon 190 keV
- can repeat V in each projection
Tc-99m DTPA aerosol
- can image V in mult. projections
- image Q after V
- 1 mCi ==> 50-75 mrad to lung
V/Q imaging

Charles E. Kahn, Jr., MD - 2 February 1995
Last updated: 1 October 2013