The largest study of its kind to date has shown that three-dimensional imaging finds more breast cancers than traditional mammography alone according to research published on Tuesday. The technique called 3D mammography or tomosynthesis was approved by US regulators in 2011 after initial research showed it could reduce false-positives and improve cancer detection. 'This study confirms what we already know: 3D mammography finds more of the invasive harmful cancers we want found and saves women the anxiety and cost of having additional exams for what turns out to be a false alarm' said study co-author Donna Plecha director of breast