Conventional X-ray exams use a stationary X-ray machine to focus beams of radiation on a particular area of your body to produce two-dimensional images. But CT scans use an X-ray generating device that rotates around your body and a very powerful computer to create cross-sectional images, like slices, of the inside of your body.

A conventional X-ray of your abdomen, for example, shows your bones as well as subtle outlines of your liver, stomach, intestines, kidney and spleen. A CT scan, however, reveals these bones and organs as well as your pancreas, adrenal glands, kidneys and blood vessels — all with a higher degree of precision.

When is a CT scan recommended?

Your doctor may recommend a CT scan to help:

• Diagnose muscle and bone disorders, such as bone tumors and fractures
• Pinpoint the location of a tumor, infection or blood clot
• Guide procedures such as surgery, biopsy and radiation
• Detect and monitor diseases such as cancer or heart disease
• Detect internal injuries and internal bleeding

Unlike MRI, CT scans can be done even if you have a pacemaker or an internal cardioverter defibrillator — devices implanted in your chest to help regulate your heartbeat. However, if you're pregnant or suspect you might be, tell your doctor. Your doctor may suggest postponing the procedure or choosing an alternative exam that doesn't involve radiation, such as an ultrasound or MRI.

(courtesy of mayoclinic.com)

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