Breast biphasic compression (22.5 degrees angled paddle, followed by progre
ssive angle reduction) was compared with standard monophasic compression in
x-ray mammography. The presence of the pectoral muscle was recorded for th
e craniocaudal (CC) view and the presence of the inframammary fold for the
mediolateral oblique (MLO) view. The amount of breast in each study and ima
ge quality were assessed for both views. For all parameters, biphasic compr
ession performed better than monophasic compression in both CC (P < .006) a
nd MLO (P < .04) views.