Comparative analysis of hepatopulmonary shunt obtained from pretherapy 99mTc MAA scintigraphy and post-therapy 90Y Bremsstrahlung imaging in 90Y microsphere therapy.

Introduction99mTc macroaggregate albumin (MAA) scintigraphy is routinely used to estimate the hepatopulmonary shunt (HPS) of 90Y microspheres because of their comparable average particle sizes (20–30 µm). However, the MAA particle size can vary from 10 to 90 µm. Therefore, HPS computed from 99mTc MA