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What is a computed tomography (CT) scan? Source: Terese Winslow. ... How does CT work? Unlike a conventional x-ray—which uses a fixed x-ray tube—a CT scanner uses a motorized x-ray source that rotates around the circular opening of a donut-shaped structure called a gantry. During a CT scan, the patient lies on a bed that slowly moves ...


Computed tomography (CT), otherwise known as computed axial tomography (CAT) scans, give doctors explicit internal images of the body, which they can use to help with diagnosis and accurate ...


How CT scans work. During a CT scan, the patient lies on a table that moves through a doughnut-like ring known as a gantry, according to the NIBIB.


Outside view of modern CT system showing the patient table and CT scanning patient aperture. Inside view of modern CT system, the x-ray tube is on the top at the 1 o'clock position and the arc-shaped CT detector is on the bottom at the 7 o'clock position.


How does the procedure work? In many ways CT scanning works very much like other x-ray examinations. Different body parts absorb the x-rays in varying degrees. It is this crucial difference in absorption that allows the body parts to be distinguished from one another on an x-ray film or CT electronic image.


Fused PET/CT scan of lungs. CT Scan of Lungs. PET scan of lungs. PET CT is a combination of a PET scan and a CT scan obtained at one time, by a single piece of equipment. Positron emission tomography, or PET, is a painless diagnostic test that allows radiologists a unique view of the body's biological functions.


CAT scans take the idea of conventional X-ray imaging to a new level. Instead of finding the outline of bones and organs, a CAT scan machine forms a full three-dimensional computer model of a patient's insides. Doctors can even examine the body one narrow slice at a time to pinpoint specific areas ...


In order to know that you are holding a pineapple and a banana, your friend would have to see your shadow in both positions and form a complete mental image. This is the basic idea of computer aided tomography. In a CAT scan machine, the X-ray beam moves all around the patient, scanning from hundreds of different angles.