How do these diagnostic procedures differ?

How do these diagnostic procedures differ?

1. XRAY

2. PET SCAN

3. MRI

3 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    1. xray-good description above. Electromagnetic radion is used to get an image of dense structures such as bone. Also because it is readiation tech are required to wear badges to ensure they are not exposed to more then the allowed amount of radiation. Can only pick up images of dense tissue, bones, or foreign objects.

    2. A Pet Scan is based on Positron emmissions. (hence PET) where the picture is produced based on emissions from a radioactive dye injected into the patient. PET scan provides images of blood flow and biochemical output

    3. MRI uses strong magnetic radio wave pulses to induce the atomic nuclear spin resonance (which is why alot of people do not like working MRI as the nuclear spin can cause dizziness). The image is 2 or 3 deminisional of soft tissue and organs and can even pick up the blood flow

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  • 1 decade ago

    X-rays are a form of radiation, like light or radio waves, that can be focused into a beam, much like a flashlight beam. Unlike a beam of light, however, X-rays can pass through most objects, including the human body. When X-rays strike a piece of photographic film, they can produce a picture. Dense tissues in the body, such as bones, block (absorb) many of the X-rays and appear white on an X-ray picture. Less dense tissues, such as muscles and organs, block fewer of the X-rays (more of the X-rays pass through) and appear in shades of gray. X-rays that pass only through air appear black on an X-ray picture.

    PET SCAN---A highly specialized imaging technique that uses short-lived radioactive substances to produce three-dimensional colored images of those substances functioning within the body. These images are called PET scans and the technique is termed PET scanning.

    PET scanning provides information about the body's chemistry not available through other procedures. Unlike CT (computerized tomography) or MRI (magnetic resonance imaging), techniques that look at anatomy or body form, PET studies metabolic activity or body function. PET has been used primarily in cardiology, neurology, and oncology.

    An MRI (or magnetic resonance imaging) scan is a radiology technique that uses magnetism, radio waves, and a computer to produce images of body structures. The MRI scanner is a tube surrounded by a giant circular magnet. The patient is placed on a moveable bed which is inserted into the magnet. The magnet creates a strong magnetic field which aligns the protons of hydrogen atoms, which are then exposed to a beam of radio waves. This spins the various protons of the body, and they produce a faint signal that is detected by the receiver portion of the MRI scanner. The receiver information is processed by a computer, and an image is then produced.

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  • 1 decade ago

    xray is 1 dimensional, a picture of the entire width in one shot. pet or cat scan is the same kind of thing, only it's two dimensional,,, you get depth and width.

    mri is three dimensional, it gives you depth width and height.....

    hope that helps.. good luck!!

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