Ct Scans And Mri's

CT Scans and MRI Shelly Jones August 10, 2011 CT Scans CT or Computed imaging scans be radiographic (roentgenogram) externalizes complied with the use of a groom reckoner. Images are taken in three to five millimetre slices, which when complied represent a three dimensional image of the interior(a) structures of the body. Physicians use these images to essay the intimates of a diligent without having to cut them open. The member by which an roentgen ray photon is produced is simple. A super heated westward filament inside a senselessness releases negatrons. This is called thermionic emission. The released electrons devolve across the vacuum in an electron cloud or space mail to jolt with a rotating tungsten wheel. The drop by the wayside electrons interact with the tungsten components in two ways. The electrons might snuggle the nucleus of the atom and slow down, losing might in the trunk of a photon. This reaction is called Bremsstrahlung radiat ion. It happens 85% of the time. The other interaction is called mark radiation. Free electrons collide with an electron in an inner font of an atom, causing both(prenominal) electrons to spin off in other directions. An electron from a higher shell drops down to fill the overturn 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 handle a short subway or closed grasp with a pitiful remit in the middle. Inside the hoop are a rotating X-ray tube, and an image receptor system, that unite to a computer that recons tructs and assembles the radiographic data i! nto 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: BestEssayCheap.com

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