( 1 ) incidence of delayed diagnoses , ( 2 ) diagnostic accuracy , as correlated to the reference standard of a synopsis of all subsequent clinical , imaging , surgical and autopsy findings , ( 3 ) patients ' safety , ( 4 ) radiation exposure ( e.g. effective dose ) , ( 5 ) subjective image quality ( assessed independently radiologists and trauma surgeons on a 100-mm visual analogue scale ) , ( 6 ) objective image quality ( e.g. , contrast-to-noise ratio ) .