Computed Tomography (CT)

Computed tomography (CT), also known as computerized axial tomography (CAT) scan, is a medical imaging technique that uses X-rays to create detailed, cross-sectional images of the body.

History

CT scans are X-rays that are processed by computers to produce visual cross-sections of specific areas of the body. Since the technology was introduced in the 1970s, CT has become an important tool in medical imaging to supplement “regular” X-rays and ultrasonography. CT is also used for preventive medicine or screening for disease. A CT scan usually lasts 10 to 30 minutes, although more advanced tests with contrast may last longer.

How it works

A CT scanner is a large, doughnut-shaped machine with a hole in the center. The patient lies on a table that slides into the hole. Inside the machine, an X-ray tube rotates around the patient, sending out a series of narrow beams through the body. Detectors on the opposite side of the tube measure the amount of X-rays that pass through the body. A computer processes this information to create cross-sectional images, or slices, of the body. These images can be viewed on a monitor, printed on film, or transferred to a CD or DVD.

Frequently Asked Questions

Magnetic Resonance Imaging (MRI) and Magnetic Resonance Angiography (MRA)

Magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA) are advanced medical imaging techniques that use strong magnets and radio waves to create detailed images of the body's organs and tissues.