Computerized axial tomography

Computerized Axial Tomography (also known as CAT or CT scan) is a diagnostic imaging procedure that uses a combination of X-rays and computer technology to produce cross-sectional images (often called slices), both horizontally and vertically, of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than general X-rays.

History

The development of the CT scan was made possible by the invention of the computer and certain key technologies in the 1960s and 1970s. The first commercially viable CT scanner was invented by Sir Godfrey Hounsfield in Hayes, United Kingdom, at EMI Central Research Laboratories using X-rays. Hounsfield conceived his idea in 1967, and it was publicly announced in 1972.

Procedure

A CT scan works by taking many X-ray measurements from different angles and producing a detailed image of a cross-section of the body. The patient lies on a table that moves slowly through the CT scanner, which is a large, doughnut-shaped machine. The X-ray tube spins rapidly around the patient and the X-rays strike numerous detectors after passing through the body.

Uses

CT scans are used to study areas of the body and diagnose diseases and conditions such as cancer or injuries. They can also be used to monitor the progress of disease and to check how well treatments are working.

Risks

While CT scans do involve exposure to radiation, the diagnostic benefits generally outweigh the risks. However, it's always important to minimize unnecessary exposure to radiation.

See also

• X-ray
• Radiology
• Diagnostic imaging
• Cancer
• Injury

References

Computerized axial tomography Resources
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