See this thread for a vi to rotate an image.
http://forums.ni.com/ni/board/message?board.id=170&message.id=112801&query.id=80349#M112801
Or take a look at the polar plot demo. There is a visible section button that lets you change the grid shape. Maybe you could add 90 degrees to your data.
Go deep inside the subvi's of the polar plot demo. There is a Get Ready.vi that has a lookup table with the angle text.