Computed tomography has a tube that gives x-rays and detectors that hold these rays. The patient is in between the two. Thus, the x-rays are held by the detectors after passing through the patient.
Since the atomic densities of the tissues of the body are different, the x-ray held by each tissue is different and thus tissue images are created. The tubes and detectors rotate 360 degrees around the patient, displaying a section of that part of the body.
In What Situations Is Computerized Tomography Used?
Diagnosis of muscle and bone disorders such as bone tumors and fractures
Accurately locating a tumor, infection, or blood clot
Guiding procedures such as surgery, biopsy, and radiation therapy
Detecting and monitoring diseases and conditions such as cancer, heart disease, lung nodules and liver masses
Monitoring the effectiveness of certain treatments, such as cancer treatment
Detecting internal bleeding
Which Body Parts Can Be Viewed with Computed Tomography?