How it works:

Follow @SIIM_Tweets and every Thursday until SIIM 2010 we’ll tweet a trivia question. To take part send an @ reply with your answer (do not send a direct message).

The winner will be randomly chosen from all correct entries on Friday morning and will be announced on Twitter. If you're the lucky winner, @SIIM_Tweets will send you a direct message with instructions on how to claim your prize.

Grand prize:

Everyone who enters the quiz in the next 4 weeks will be entered to win the grand prize: a copy of the SIIM textbook, Practical Imaging Informatics: Foundations and Applications for PACS Professionals. The grand prize winner will be announced during the SIIM 2010 Annual Meeting.

Good luck!