Ct Scans And Mri's

CT Scans and MRI Shelly Jones August 10, 2011 CT Scans CT or Computed imaging scans ar radiographic (roentgenogram) come acrosss complied with the use of a arrange reckoner. Images are taken in three to five millimetre slices, which when complied represent a three dimensional image of the home(a) structures of the body. Physicians use these images to essay the intimates of a diligent without having to cut them open. The service by which an roentgenogram photon is produced is simple. A super heated tungsten filament inside a senselessness releases negatrons. This is called thermionic emission. The released electrons extend across the vacuum in an electron cloud or space mail to jolt with a rotating tungsten wheel. The indigent electrons interact with the tungsten components in two ways. The electrons might onslaught the nucleus of the atom and slow down, losing might in the go of a photon. This reaction is called Bremsstrahlung radiation. It happen s 85% of the time. The other interaction is called distinctive radiation. Free electrons collide with an electron in an inner vanquish of an atom, causing both(prenominal) electrons to spin off in other directions. An electron from a higher shell drops down to fill the alter space, losing energy in the process, which is emitted in the form of a photon. These photons are what make up the x-ray beam.

The CT scanner looks bid a short electron tube or closed kitchen range with a pitiful turn off in the middle. Inside the glory are a rotating X-ray tube, and an image receptor system, that marry to a computer that recon structs and assembles the radiographic data ! into the CT image. During the scan, the table moves through the doughnut with the patient on it, and the X-ray tube and detectors circle the patient in a spiral pattern. The X-rays tick different types of tissue to different degrees. This is called attenuation. The CT scanner is programmed to exchange the intensity of the X-rays in format to image the different types of tissue. sometimes a dye, called contrast, will...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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