RT 265 Test Q25

  1. What is the principal difference between screen film & CR?
    A. Analog vs digital
    B. Involves light
    C. Requires processing
    D. Uses imaging plate
    A. Analog vs Digital
  2. The laste light used in CR?
    a. is in the Ultraviolet region
    b. Is more energentic than stimulated light
    c. Is pulsed acrossed the photstimulable phoshor
    d. Has longer Wavelength tha stimulated light
    e. Produces light of Intense Fluorescence
    d. Has a Longer Wavelength than Stimulated light
  3. Which step can be eliminated for CR (vs used in film screen)
    a. Hang images
    b. Perform examinations
    c. Process image
    d. Reload the cassette
    e. Repeat the examination
    a. Hanging the images on the light box is only done with film screen
  4. What is an Electron that is described as being Metastable?
    a. Is outside of the Atom
    b. Is present in positive & negative form
    c. Is the transformation of an x-ray
    d. Has been captured by the nucleus
    e. Has Higher energy than it should have
    • e. Has higher energy than it should have normally
    • (Meta= above + stable =above stable)
    • (higher energy)
  5. Doping of a photostimulable sphosphor w/ Europium =
    a. Better contrast
    b. Better spatial resolution
    c. igher x-ray absorption
    d. Lower patinet dose
    e. More stimulable light emission
    e. Results in More Stimulable light Emission
  6. What Activator in a Photostimulable phosphor is there to do what?
    a. Define Laser wavelength
    b. Enhance electron Metastability
    c. Increase x-ray absorption
    d. Select the proper Wavelength
    e. Shape the wavelength of stimulable emission
    b. Enhance Electron Metastability
  7. Which of the Following is Most Intense?
    a. Laser light
    b. Normal Visual Light
    c. Optical lens support
    d. STimulable emission
    e. x-ray beam
    a. Laser light is the Most Intense
  8. Which of the following is monochromatic?
    a. Infrared light
    b. Laser light
    c. Stimulated emission
    d. visible light
    e. x-ray beam
    b. Laser light
  9. Photostimulable phosphor image receptor are effective because:
    a. Metastable states are produced
    b. Optical Density is Proportional to Dose
    c. Spatial Resolution is Improved
    d. Their response follows the H & D curve.
    e. They are composed of detector elements (DELs)
    a. Metastable staes are Produced
  10. The electron binding energy of a photostimulable phosphor is closets to
    a. 10keV
    b. 20 keV
    c. 35 keV
    d. 50 keV
    e. 75 keV
    c.  35 keV- is the closest binding energy of a photstimulable phosphor
  11. As a descriptor of a photostimulable phosphor, The term Turbid refers to an apperance of
    a. black
    b. Clear
    c. Color
    d. Cloudy
    e. Gray
    d. Cloudy
  12. Europium is an Activator in the photostimulable phosphor. An Activator is Responsible for ?
    a. Contrast Resolution
    b. Emitted light intensity
    c. Reduced patient Dose
    d. Spatial Resolutin
    e. x-ray absorption
    b. Emitted Light intensity
  13. Photostimulable phosphor image receptors:
    a. Are relatively insenitive to x-rays
    b. Become radiation fatigued with age
    c. Can be fogged by background radiation
    d. Have better spatial resolution than screening-film
    e. Require Higher Patient Dose
    c. Can be fogged by background radiation
  14. To remove the iamge of background radiation or a previous image, you should:
    a. Clear the image receptor with a cleaning solution
    b. Expose the image receptor to intense light.
    c. Expose the image recptor to intense x-ray exposure
    d. Store the image receptor for 3days
    e. Transfer the image receptor signal to digital storage
    b. Expose the image receptor to intense light
  15. Which of the following is the proper sequence for producing a CR image?
    a. Erase/read/expose
    b. Expose/erase/read
    c. Expose/read/erase
    e. Read/expose/erase
    c. Expose/Read/Erase
  16. 25-2
    Q1. The photostimulable emission in CR:
    a.Has Longer Wavelength than Laser stimulating light
    b. Has Shorter Wavaelength than Laser stimulating light
    c. Is discrete, as is the Laser-stimulating light
    d. Is in the far infrared region of the Specturm
    e. Is monochromatic, as is the laser-stimulating light
    b. Has a Shorter wavelength than Laser stimulating light
  17. 25-2 (Q2) The slow-scan portion of the CR reader:
    a. Has a speed that is determined by the emission rate
    b. Is under mechanical control
    c. Is under Optic Control
    d. Relies on a Photometric Respone
    e. Requires mirrors & prisms
    • b. Is udner Mechanical Control
  18. 25-2 (Q3) Spatial Resolution is CR is Principally determined by:
    a. Fast-scan rate
    b. Field of View (FoV)
    c. Laser beam diameter
    d. Phosphor size
    e. Slow-scan rate
    c. Laser Beam diameter
  19. 25-2 (Q4) The source of the stimulating light is:
    a. Emitted light
    b. The laser
    c. The Optic path
    d. The photmeter
    e. X-radiation
    b . The laser is the source of stimulating light
  20. 25-2 (Q5) What is the approximate diameter of the laser beam?
    a. < 1 um
    b. 10um
    c. 100um
    d. 1000um
    e. >1000um
    c. 100 um
  21. 25-2 (Q6) How does the CR reader maintain the laser beam as a circle
    a. Beam-shaping optics
    b. Fast-scan regulation
    c. Intensity control
    d. Light-collecting optics
    e. Slow-scan regulation
    a. Beam-shaping optics
  22. 25-2(Q7) Which of the followig is NOT a Photodector
    a. ADC
    b. CCD
    c. CMOS
    d. PD
    e. PMT
    a. ADC is NOT a Photodector
  23. 25-2 (Q8) The x-ray capture element of a CR image plate is?
    a. BaFlBr
    b. Cassette
    c. CCD
    d. Laser beam
    e. Light-collecting optics
    b. Cassette
  24. 25-2 (Q9) The characteristic Curve of a CR imaging plate is described as
    a. Detective quantum effciency
    b. Image Buffer
    c. Image Receptor response function
    d. Modulation transfer function
    e. Sampling quantization
    c. Image receptor response function
  25. 25-2 (Q10) A screen film image receptor is responsive over how many oders of mangitude
    a. One
    b. Two
    c. Three
    d. Four
    e. Five
    c. Three (0-3 optical desnity responsive)
  26. 25-2 (Q11) An advantage of CR over Film screen is relatively constant:
    a. Image contrast
    b. Image processing
    c. Optical Density
    d. Patient positioning
    e. Radiographic techniques
    a. Image contrast
  27. 25-2 (Q12) Patient radiation dose reduction in CR is limited by?
    a. Fast-scan mode
    b. Image contrast
    c. Patient size
    d. Slow-scan mode
    e. System noise
    e. System noise
  28. 25-2(Q13) Which of following applies to CR when it is compared to Film screen.
    a. kVp is less important
    b. Image processing is faster
    c. mAs is less important
    d. Optical density is better
    e. Patient positioning is easier
    a. kVp is less important
  29. 25-2 (Q14) Which of the following is an advantage of CR over screen film?
    a. EAsier viewing
    b. Fewer repeats
    c. Patient positioning
    d. Patient scheduling
    e. Technique selection
    b. Fewer Repeats
  30. 25-2(Q15) A CR image receptor is responsive to an x-ray beam over how many orders of magnitude?
    a. One
    b. Two
    c. Three
    d. Four
    e. Five
    d. Four
Card Set
RT 265 Test Q25
RT 265 Test Q 25-1, 25-2,