Imaging technology group E2V Technologies voiced caution about the economic outlook in its markets, causing its shares to fall.The group, which makes imaging equipment used in dentistry, aerospace & defence, satellite communications and cargo screening, said in a trading statement covering the period since October 1st that it remained wary about the broader economy, including the US defence and machine vision sectors.It said its financial position remained strong, adding: "If there is no further deterioration in market and foreign exchange conditions, management's expectations for the group's full year trading performance are broadly unchanged."Shares in the group, which is due to announce annual results on Monday May 19, fell 3.57% to 155.25p.PW