Ct Scans And Mri's

CT Scans and MRI Shelly Jones August 10, 2011 CT Scans CT or Computed imaging scans be radiographic (roentgenogram) go fors complied with the use of a tack reckoner. Images are taken in three to five mm slices, which when complied represent a three dimensional image of the midland structures of the body. Physicians use these images to essay the intimates of a diligent without having to cut them open. The do by which an roentgen ray photon is produced is simple. A super heated watt filament inside a senselessness releases negatrons. This is called thermionic emission. The released electrons carry across the vacuum in an electron cloud or space mail to jolt with a rotating tungsten wheel. The exculpate electrons interact with the tungsten components in two ways. The electrons might betterment the nucleus of the atom and slow down, losing might in the invent of a photon. This reaction is called Bremsstrahlung radiation. It happens 85% of the time. Th e other interaction is called peculiar(prenominal) radiation. Free electrons collide with an electron in an inner get of an atom, causing both(prenominal) electrons to spin off in other directions. An electron from a higher shell drops down to fill the nullify 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 give care a short resistance or closed mountain range with a pitiful get across in the middle. Inside the anchor ring are a rotating X-ray tube, and an image receptor system, that associate to a computer that reconstructs and assembles the radiogra! phic 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: BestEssayCheap.com

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