Ch. 10 X-ray Imaging

33 Questions

Settings
Please wait...
Xray Quizzes & Trivia

Compton, photeletric integration, KeV, K-shell, incident photons


Questions and Answers
  • 1. 
    List the five (4) basic x-ray interactions with matter: 3. through the photoelectric effect
  • 2. 
    The higher the xray energy the __________________ the wavelength
    • A. 

      Longer

    • B. 

      Shorter

    • C. 

      Higher

    • D. 

      Bigger

  • 3. 
    Low-energy x-rays (Thompson) tend to interact with the _____________
    • A. 

      Z#

    • B. 

      High-energy x-rays

    • C. 

      Photoelectrons

    • D. 

      Targer atom

  • 4. 
    A change in the direction of the x-ray w/out a change in it's energy is called:
    • A. 

      Coherent scattering

    • B. 

      Photodisintegration

    • C. 

      Compton effect

  • 5. 
    X-rays with 5 kev of energy are most likely to undergo _______________ scattering
    • A. 

      Coherent

    • B. 

      Compton

    • C. 

      Backscatter

    • D. 

      Electron

  • 6. 
    What produces a uniform density of the radiograph called image noise?
    • A. 

      Image fog

    • B. 

      Filter

    • C. 

      Photidisintegration

    • D. 

      Coherent scattering

  • 7. 
    • A. 

      Scattered x-ray

    • B. 

      Fluoroscopy

    • C. 

      Compton interaction

    • D. 

      Pair production

  • 8. 
    Compton effect: most of the incident photon energy is retained by the___________________
    • A. 

      Photoelectron

    • B. 

      Scattered x-ray

    • C. 

      X-ray

    • D. 

      K-shell

  • 9. 
    The formula Ei : E, + (Eu + Ers) represents the_______________  
    • A. 

      Photoelectron

    • B. 

      Compton effect

    • C. 

      Thompson

    • D. 

      Pair production

  • 10. 
    is responsible for the cassette-hinge sometimes seen on a radiographic image.
    • A. 

      Scattered x-ray

    • B. 

      Image fog

    • C. 

      Image noise

    • D. 

      Backscatter

  • 11. 
    After a Compton interaction, the Compton secondary electron drops into a______________- in an electron shell previously created by some other ___________________ event
    • A. 

      Vacancy, ionizing

    • B. 

      Another shell, ionizing

    • C. 

      Outer shell, photoelectric

    • D. 

      L-shell, photoelectric

  • 12. 
    The probability that an x-ray will undergo a  photoelectricinteractionisapproximately__________times greater in bone than in soft tissue.
    • A. 

      10

    • B. 

      4

    • C. 

      7

    • D. 

      2

  • 13. 
    The source of most of the occupational exposure to radiation comes from the_________ during ________________
    • A. 

      Diagnostic x-ray, an exam

    • B. 

      Light, x-ray

    • C. 

      Patient, an exam

    • D. 

      Patient, fluroscopy

  • 14. 
    The two types of interaction that are of primary importance due to the levels of energy in diagnostic radiology are____________ and ________________
  • 15. 
    The probability of a Compton interaction is _____________of the atomic number of the atom involved.
    • A. 

      Proportional

    • B. 

      Independent

    • C. 

      Inversely proportional

    • D. 

      Depending

  • 16. 
    In a Compton interaction, at a deflection of zero (0) degrees from the incident photon,________________ energy is transferred.
    • A. 

      100%

    • B. 

      50%

    • C. 

      0

    • D. 

      35%

  • 17. 
    An x-ray undergoes an ionizing interaction with an inner-shell electron and is totally absorbed best describes the --
    • A. 

      Photoelectric effect

    • B. 

      Compton effect

    • C. 

      Butterfly iffect

    • D. 

      Pair production

  • 18. 
    During Compton scattering, photon interaction is more likely to occur with ________________ electrons
    • A. 

      Low energy

    • B. 

      Scattered

    • C. 

      High energy

  • 19. 
    The formula Er.: Ki- Ku may be used to calculate the energy of the electron emitted during a _________________ interaction
  • 20. 
    The type radiation emitted when an electron drops from an outer-shell to an inner-shell is _________________________
    • A. 

      Scattered

    • B. 

      K-shell

    • C. 

      Characteristic

    • D. 

      Photoelectric

  • 21. 
    Dwingphotoelectric effect interactions, (electron transition) the vacancy in the last shell is filled by a
    • A. 

      L-shell

    • B. 

      Inner shell

    • C. 

      Outer shell

    • D. 

      Electron

  • 22. 
    The probability of photoelectric interaction is _______________proportional to the_________ power of the atomic number of the absorbing material.
  • 23. 
    • A. 

      Outer shell

    • B. 

      K-shell

    • C. 

      Target atom

    • D. 

      Electron binding energy

  • 24. 
    ____________ scattering is most likely to reduce contrast in a diagnostic x-ray image
    • A. 

      Coherent

    • B. 

      Covalent

    • C. 

      Compton

    • D. 

      Characteristic

  • 25. 
    The ____________________ effect results in the light areas on a radiograph (low optical density), such those corresponding to bone
    • A. 

      Photoelectric

    • B. 

      Image noise

    • C. 

      Compton

  • 26. 
    Thequantrty of matter per unit volume, usually specified in units of kilograms per cubic meter (kglttt') best defines___________________
    • A. 

      The photoelectric formula

    • B. 

      Calculation of energy

    • C. 

      Dependence on mass density of matter

    • D. 

      Attenuation law

  • 27. 
    Lungs are imaged on a chest radiograph primarily because of differences in
    • A. 

      Mass density

    • B. 

      Image quality

    • C. 

      Image quantity

    • D. 

      X-ray

  • 28. 
    The total reduction in the number of x-rays remaining in an x-ray beam after penetration through a given thickness of tissue is called
    • A. 

      Differntial absorption

    • B. 

      Attenuation

    • C. 

      Filtration

    • D. 

      Bone density

  • 29. 
    Barium and iodinated compounds are used as an aid for imaging internal organs primarily because of their _________ atomic number and _______________ densities compared with soft tissue
    • A. 

      Low, low

    • B. 

      High, high

    • C. 

      High, high mass

    • D. 

      Mass, high

  • 30. 
    Theoretically, based on the attenuation rule, the number of x-rays emerging from any thickness of absorber will never reach 0
    • A. 

      True

    • B. 

      False

  • 31. 
    interactions occur with energies greater than approximately 10 MeV
  • 32. 
    5% percent of the x-ray incident on a patient actually reach the image receptor.
    • A. 

      True

    • B. 

      False

  • 33. 
    Differential absorption increases as the _______________ is increased
    • A. 

      Kev

    • B. 

      Ma

    • C. 

      Kvp

    • D. 

      Contrast