Mammograms are the gold standard for screening, but they're not perfect.

Now, a new screening tool is helping detect tumors that mammograms miss.

Mammograms can miss about 20% of cancer during a screening. The A-Bus tool is giving doctors a clearer picture.

Breast radiologists have women lie on their backs as the A-Bus presses down on the chest wall.

High frequency sound waves capture precise 3D images of the breasts. For every 1,000 patients getting an A-Bus exam, one to two more cancers are found than with mammography alone.

The entire process takes about 30 minutes — time that could end up saving your life.

Another advantage of the exam is images taken with A-Bus can be reproduced yearly to help with comparing tissue changes from year to year.

Watch the video above for the full story.