TwoImax large-format 3D films, T-Rex: Back To The Cretaceous and Space Station, passed box office milestones this week, havingearned $75m and $50m respectively.

Releasedin 1998, T-Rex remains thehighest grossing 3D film while Space Station, released in 2002, continues its position as thefastest-growing 3D film.

WhileSpace Station's 55 weeks at thebox office may seem glacially slow relative to conventional releases, it waslightening quick compared with the progress of the first space-based Imaxtitle, The Dream Is Alive, thehighest grossing Imax film ever, which opened in 1985 and has grossed $150m todate.

Priorto its premiere in April of 2002, Space Station was pre-leased by 122 Imax cinemas - the most ever,and an indication of the increasing number of Imax cinemas. There are more than230 worldwide.

Suchfilms continue the educational role that established the Imax brand but whichthe company hopes to rely on less as it attempts to create a new theatricalrelease window for Hollywood event films, like The Matrix Reloaded and The Matrix Revolutions.

Upnext for the large format pioneer is the race car-based Nascar: The Imax Experience3D, which will be released in 2004.