Significantly greater cancer detection rates were noted by all three readers for comparisons of gadobenate dimeglumine-enhanced MRI with mammography ( 15.817.5 % ; P < 0.0001 ) , ultrasound ( 18.320.0 % ; P < 0.0001 ) , and mammography and/or ultrasound ( 8.610.7 % ; P 0.0105 ) but not for comparisons of gadopentetate dimeglumine-enhanced MRI with conventional techniques ( P > 0.05 ) .