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

© 2002, C.E. Kahn, Jr.
2002-04-18