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MRI and CT imaging

Background

CT scans utilize X-rays to produce images of the inside of the body while MRI (magnetic resonance imaging) uses powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs and other internal body structures.

  • CT scans use radiation (X-rays), and MRIs do not.
  • MRIs provide more detailed information about the inner organs (soft tissues) such as the brain, skeletal system, reproductive system and other organ systems than is provided by a CT scan.
  • CT scans are quick, painless, and noninvasive.
  • MRI scans are not invasive, but they are noisy, take more time, and may cause claustrophobia (anxiety due to being in the enclosed space of the machine).
  • MRI scans are costlier than CT scans.
  • MRI scanners use strong magnets.

A CT (computerized tomography) scan is a combination of a series of X-ray images taken at different angles; the CT uses a computer to create images from these X-rays.

An MRI (magnetic resonance imaging) is a scan that uses magnetic fields and radio waves to produce a detailed image of the body’s soft tissues and bones.

How does a CT scan (cat scan) work?

A CT scan works by taking multiple X-rays at various angles and then utilizes those X-rays to form a three-dimensional image of whatever organ system is being examined. A computer examines all of the various X-rays taken at different angles and synthesizes the images to form a three-dimensional computer model of internal organs.