CT Registry Review May 13,2010

59 Questions | Total Attempts: 761

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CT Registry Quizzes & Trivia

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Questions and Answers
  • 1. 
    Tungsten is used as the target material on the tube's anode because it has a _____ atomic number and a ______ melting point.
    • A. 

      Low, high

    • B. 

      High, low

    • C. 

      Low, low

    • D. 

      High, high

  • 2. 
    _________________ scanner design was the first to acquire four slices in the single rotation.
    • A. 

      Second-generation

    • B. 

      Third-generation

    • C. 

      Multi-row detector

    • D. 

      Continuous rotation

  • 3. 
    The enormous heat that builds up in the CT tube is caused by the:
    • A. 

      Intensity of the x-rays emitted from the tube

    • B. 

      Electron beam between the cathode and the anode in the tube

    • C. 

      X-ray filter in the tube which absorbs the lower energy photons

    • D. 

      Collision of the electron beam with the tungsten target on the tube anode

  • 4. 
    The number of electrons that from from the cathode to the anode in the tube is controlled by the:
    • A. 

      Anode target

    • B. 

      Collimation

    • C. 

      MA

    • D. 

      KV

  • 5. 
    The slip ring on continuous rotation CT scanners:      1. prevent the high voltage cable from winding up      2. allows the exam to commence more rapidly      3. eliminates the need for the reversal of gantry frame rotation
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1,2,&3

  • 6. 
    Which of the following is NOT a part of the CT tube?
    • A. 

      Tungsten target

    • B. 

      Collimator

    • C. 

      Rotating anode

    • D. 

      Filament

  • 7. 
    Which of the following are NOT commonly used on today's commercially available CT scanners?      1. xenon detectors      2. fourth-generation technology      3. continuous rotation technology
    • A. 

      1 only

    • B. 

      1 & 2

    • C. 

      2 & 3

    • D. 

      1, 2, & 3

  • 8. 
    Which system component converts the projection attenuation data into the proper digital form for the array processor?
    • A. 

      Detector

    • B. 

      Photodiode

    • C. 

      Analog-to-digital converter

    • D. 

      Host computer

  • 9. 
    X-ray photons are produced by a fast-moving electron:      1. colliding with an atomic nucleus      2. passing close to an atomic nucleus      3. colliding with an electron within an atom and ejecting it
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 10. 
    Which of the following is TRUE regarding solid state detectors?      1. x-ray photons cause the detectors to generate a flash of light      2. they are the detector type used on most CT scanners today      3. they can be used in both third-generation and fourth-generation CT systems
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 11. 
    CT is commonly referred to as all of the following names EXCEPT:
    • A. 

      Computerized axial tomography

    • B. 

      Digital subtraction angiography

    • C. 

      CAT-scan

    • D. 

      Computed tomography

  • 12. 
    What control does the operator have over the x-rays in a CT exam
    • A. 

      The temperature and color of the x-rays can be tuned

    • B. 

      The energy level and the quantity of x-rays can be selected

    • C. 

      The volume and tone of the x-rays can be dialed

    • D. 

      The phase and frequency of the x-rays can be adjusted

  • 13. 
    Which of the following statements is TRUE?     1. kV is the voltage potential between the tube cathode and anode while mA ultimately controls the filament current and, thus, the temperature of the cathode filament.      2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray photons emitted from the tube      3. although the kV and the mA affect the operation of the CT x-ray tube, the two paramanters have no bearing on the image quality
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      1 & 2

    • D. 

      2 & 3

  • 14. 
    Which of the following does NOT affect the quantity of x-rays that completely penetrates the patient?      1. the distance that the x-ray photons must travel on their course though the patient's body      2. the molecular composition of the tissues though with the x-ray photons pass      3. the type of detector material used
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 15. 
    ___________made helical imaging possible.
    • A. 

      Multi-row detector scanners

    • B. 

      The introduction of second-generation technology

    • C. 

      The introduction of fourth-generation technology

    • D. 

      Continuous rotation scanners

  • 16. 
    Which of the following statements is FALSE regarding the collection of CT date?
    • A. 

      Long scan times are more desirable because they average out motion artifacts

    • B. 

      The reconstruction process used to create the image occurs in the array processor

    • C. 

      To collect the complete set of CT data, x-rays mus be passed through the body at many different angles

    • D. 

      The detectors measure x-rays which completely penetrate the patient

  • 17. 
    Which of the following is a component NOT normally located in the gantry of a modern CT system?
    • A. 

      Pre-patient collimators

    • B. 

      Solid-state detectors

    • C. 

      Array processor

    • D. 

      X-ray tube

  • 18. 
    X-rays are used in CT because:
    • A. 

      They are easily produced by the high frequency generator

    • B. 

      They are less harmful than the heating effects of microwave radiation

    • C. 

      They penetrate the body according to specific attenuation characteristics of each tissue

    • D. 

      The FDA imposes no limit on the dose of the patient

  • 19. 
    X-rays are produced whenever fast-moving electrons collide with any form of matte because:      1. the electron splits into two x-ray photons of equal energy upon impact with the matter      2. the electron loses kinetic energy which is converted into the emission of an x-ray phone      3. the electron converts the electron it collides with into an x-ray photon
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 20. 
    Bremsstrahlung radiation does NOT include which type of electron activity?      1. collision between an incoming electron and the nucleus of the target atom.      2. collision between an incoming electron and an electron in an inner shell of the target atom.      3. slowing down of an incoming electron due to the effect of passing close to the positive charge of the nucleus of the target atom.
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, and 3

  • 21. 
    The mA determines the :
    • A. 

      Quantity of x-ray photons

    • B. 

      Coefficient of attenuation

    • C. 

      Slice thickness

    • D. 

      Energy level of the x-ray photons

  • 22. 
    Increased __________ will increase the likelihood that a given x-ray will penetrate a material.      1. kV      2. mA      3. exposure time
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, and 3

  • 23. 
    Collimation:
    • A. 

      Is accomplished by electrically blocking x-rays

    • B. 

      Affects the scan time

    • C. 

      Limits the low energy x-ray photons and passes the high energy photons

    • D. 

      Is accomplished by physically blocking x-rays

  • 24. 
    Scatter radiation is caused by:
    • A. 

      Miscalibrated detector

    • B. 

      X-rays generated spontaneously in the ambient atmosphere

    • C. 

      Deflections from the original trajectory of an x-ray photon through the patient

    • D. 

      Improper patient positioning

  • 25. 
    Which technology do multi-row detector scanners employ?
    • A. 

      Second-generation

    • B. 

      Third-generation

    • C. 

      Fourth-generation

    • D. 

      First-generation

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