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A chest computed tomography (to-MOG-ra-fee) scan, or chest CT scan, is a painless, noninvasive test. It creates precise pictures of the structures in your chest, such as your lungs. Noninvasive means that no surgery is done and no instruments are inserted into your body.
Doctors use chest CT scans to: 1  Show the size, shape, and position of your lungs and other structures in your chest. 2  Follow up on abnormal findings from standard chest x rays. 3  Find the cause of lung symptoms, such as shortness of breath or chest pain.he chest CT scanning machine takes many pictures, called slices, of the lungs and the inside of the chest. A computer processes these pictures; they can be viewed on a screen or printed on film. The computer also can stack the pictures to create a very detailed, three-dimensional (3D) model of organs.