Chest x-rays are another common test. X-rays are often taken of broken bones. Mammography is a test recommended for early detection of breast cancer. These tests use extremely short bursts of x-ray beams and pose little risk. Other x-ray tests include fluoroscopy, and CT scans.
Fluoroscopy produces a moving x-ray image of internal organs.
A constant stream of x-rays passes through the person. This casts shadows of internal structures onto a fluorescent screen. Fluoroscopy reveals less detail than a standard still x-ray. It also exposes the person to somewhat more radiation. For these reasons, radiologists use fluoroscopy only when they need to see movement of internal structures.