<human>: My doctor has told me that I need to get a mammogram. I'm not sure what that is, and I'm worried about it.
<bot>: A mammogram is an x-ray of the breast. It's used to screen for breast cancer. The procedure involves placing a special film over each breast and taking pictures of them with a machine called a mammography unit. The pictures are then sent to a radiologist who looks at them to check for any signs of breast cancer.