Like other x-ray imaging exams, ct scans expose you briefly to a small, targeted amount of ionizing radiation. the radiation helps create an image of structures inside your body. ct scans provide more-detailed images of more types of tissue than traditional x-rays do, which allows your doctor to detect and locate many medical conditions.. ct scans have various purposes. Ctscans are sometimes referred to as cat scans or computed tomography scans. they are carried out by specially trained operators who are called radiographers. for the manchester lung health check programme we use ultra-low dose ct, which means the exposure to radiation is extremely low, similar to that of an x-ray. Ct lung screening is a noninvasive, painless procedure that uses low-dose x-rays to screen the lungs for cancer in just 30 seconds. a ct lung screening allows the radiologist to look at different levels, or slices, of the lungs using a rotating x-ray beam. it is performed on a multislice spiral computed tomog...