Rad Review Test 1

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Rad Review Test 1
2015-01-23 21:02:19
Rad Review Test

Rad Review Test 1
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  1. D Multifield image intensifier tubes are usually either dual-field or tri-field and are designed this way in order to permit magnification imaging. As voltage is applied to the electrostatic focusing lenses, the focal point moves back—closer to the input phosphor—and a smaller portion of the input phosphor is utilized. As a result, the FOV decreases and magnification increases, producing better spatial resolution. At the same time, brightness is decreased requiring an increase in mA (therefore increased patient dose). This increase in mA increases image quality. It can be likened to an increase in signal-to-noise ratio
    In the parieto-orbital projection, the patient is PA with the acanthomeatal line perpendicular to the IR. The head rests on the zygoma, nose, and chin, and the MSP should form a 53° angle with the IR (37° with the central ray). Radiographically, the optic canal should appear in the lower outer quadrant of the orbit. Incorrect rotation of the MSP results in lateral displacement, and incorrect positioning of the baseline results in longitudinal displacement.
  2. When caring for a patient with an IV line, the radiographer should keep the medication  
    A 18 to 20 inches above the level of the vein.  
    B 18 to 20 inches below the level of the vein.  
    C 28 to 30 inches above the level of the vein.  
    D 28 to 30 inches below the level of the vein.
  3. In which stage of infection do the infective microbes begin to multiply?
    A Latent period  
    B Incubation period  
    C Disease phase  
    D Convalescent phase
  4. Symptoms of impending diabetic coma include
    1-increased urination.
    2-sweet-smelling breath.
    3-extreme thirst.
  5. Which occurs when radiation transfers its energy to DNA?

    indirect effect
    target theory 
    direct effect 
    direct effect 
  6. Which of the following body molecules are most commonly acted upon directly by ionizing radiation to produce indirect effects?

  7. Which of the following is responsible for producing free radicals?

    target theory 
    direct effect
    indirect effect 
    target theory
  8. Why is free radical formation considered such a threat to humans?

    free radicals produce scatter radiation
    free radicals can penetrate any type of shielding 
    free radicals have been proven to have carcinogenic effects  
    free radicals have observed to produce toxic effects
    free radicals have observed to produce toxic effects