When performing breast cancer screening for women above 40, a mammogram is considered the choice procedure. It differs from an ultrasound in terms of detecting calcifications (especially microcalcifications), which is a sign of early stages breast cancer. Ultrasound of the breast is only able to detect breast cancer when the breast tissue has a growth that is large enough to be considered. Due to pain and radiation, many women fear mammograms. With constant technological advancements, the newer models of mammogram machines are more sensitive, which can reduce the pain and radiation during this process.