Mammography is the best way to detect breast cancer early. One in eight women will develop invasive breast cancer in their lifetime. Breast cancer is sometimes found after symptoms appear, but many women with breast cancer have no symptoms. A mammogram uses a machine designed to look specifically at breast tissue. The machine takes x-rays at lower doses than usual x-rays. Because these x-rays don’t go through tissue easily, the machine has two plates that compress or flatten the breast to spread the tissue apart. This gives a better picture and allows less radiation to be used.