what is the highest throughput astronomy project in pixels?
If you refer to "data volume" instead of real image pixels, it would be the Millenium Run (25TB of data):

http://www.mpa-garching.mpg.de/galform/virgo/millennium/


  The Millennium Run used more than 10 billion particles to trace the
  evolution of the matter distribution in a cubic region of the Universe
  over 2 billion light-years on a side.