Cat Scan Review

91 Questions | Total Attempts: 216

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Computed Tomography Quizzes & Trivia

Question for Computed Tomography Registry


Questions and Answers
  • 1. 
    What is an advantage of scans of the pituitary taken in the coronal plane?
    • A. 

      IV contrast material is better visualized

    • B. 

      Streak artifacts are reduced or eliminated.

    • C. 

      The patient is more comfortable during scanning.

    • D. 

      The patient receives a lower radiation dose

  • 2. 
    Which two strategies can reduce the effect of dental fillings in a sinus study?
    • A. 

      High mA and shcrt scan time

    • B. 

      Low kVp and high contrast, or bone alogrithm

    • C. 

      Adjust the angle of the gantry and widen the window width

    • D. 

      Small focal spot and small display field

  • 3. 
    Which of the following conditions may be visualized in a CT study of the brain?
    • A. 

      Glioblastoma

    • B. 

      Wilm's Tumor

    • C. 

      Krukenberg Tumor

    • D. 

      Plasmacytosis

  • 4. 
    Which of the following is affected by teh slice spacing in a CT study?
    • A. 

      Spatial Resolution

    • B. 

      Quantum Mottle

    • C. 

      Radiation Dose to the Patient

    • D. 

      Signal-to-Noise Ration

  • 5. 
    What is the name of the pinecon-shaped structure of the brain the can often be seen as calcified in CT images?
    • A. 

      Choroid Plexus

    • B. 

      Pineal Gland

    • C. 

      Caudate Nucleus

    • D. 

      Middle cerebral Artery

  • 6. 
    Third generation (rotate/rotate) scanners overcame which of the following limitations?
    • A. 

      Detector singal drift sensitivity

    • B. 

      Translation motion

    • C. 

      Spurious signals from moving signal wires

    • D. 

      Cost

  • 7. 
    What helical or spiral computed tomography term is defined as the table increment in distance per mm per 360 degrees gantry rotation divided by the section thickness in mm?
    • A. 

      Rotation

    • B. 

      Spiral

    • C. 

      Helix

    • D. 

      Pitch

  • 8. 
    What determines the section thickness?
    • A. 

      Scan arc

    • B. 

      Filtration algorithm

    • C. 

      Incident beam collimation

    • D. 

      Detector alignment

  • 9. 
    What effect would an array processor failure have on image processing?
    • A. 

      Increase image display time

    • B. 

      Halt analog to digital conversions

    • C. 

      Lengthens detector data acquisition time

    • D. 

      Decrease xray tube output

  • 10. 
    What change will occur in the number of detected photons if a section thickness is changed from 5 mm to 10mm?
    • A. 

      Decrease 50%

    • B. 

      Decrease 25%

    • C. 

      Increase 50%

    • D. 

      Increase 100%

  • 11. 
    Which of the following will magnify the image?
    • A. 

      Increase field of view

    • B. 

      Decreasing field of view

    • C. 

      Increasing section thickness

    • D. 

      Decreasing section thickness

  • 12. 
    Which of the following is convolution?
    • A. 

      Filtered back projection

    • B. 

      Fourier transform

    • C. 

      Iterative filtration

    • D. 

      3-d rendering

  • 13. 
    Which of the following determines the maximum number of shades of gray that can be displayed on the CT monitors?
    • A. 

      Window level

    • B. 

      Window width

    • C. 

      Pixel size

    • D. 

      Matrix size

  • 14. 
    Which of the following are benefits of narrower section thicknesses?
    • A. 

      Reduced partial volume averaging and improved spatial resolution

    • B. 

      Decreased scan time, and more anatomy covered

  • 15. 
    Which of the following is the term used to describe a voxel value that is the average of multiple tissue types contained within the voxel?
    • A. 

      Linear attenuation coefficient

    • B. 

      Partial volume averaging

    • C. 

      Low contrast resolution

    • D. 

      Edge gradient averaging

  • 16. 
    Which of the following CT numbers would appear as a gray shades when a window width of 300 and a window level of 0 are selected?
    • A. 

      Ct numbers above +300

    • B. 

      Ct numbers between +150 and +300

    • C. 

      Ct numbers between +150 and -150

    • D. 

      Ct numbers below -150

  • 17. 
    Which fo the following is the central value in a range of gray shades used to display the image?
    • A. 

      Window width

    • B. 

      Window level

    • C. 

      Region of interest

    • D. 

      Dose index

  • 18. 
    What is the most common type of film used to recore CT exams?
    • A. 

      Single emulsion

    • B. 

      Double emulsion

    • C. 

      Triple emulsion

    • D. 

      Rare earth

  • 19. 
    Which of the following increase signal to noise ration?
    • A. 

      Increased mAs

    • B. 

      Wider section thickness

    • C. 

      Increased detection efficiency

  • 20. 
    What is the appropriate compensation to avoid quantum noise when performing thin section computed tomography?
    • A. 

      Increase mAs

    • B. 

      Decrease field of view

    • C. 

      Increase matrix size

    • D. 

      Decrease scan speed

  • 21. 
    Which describes the relationship between section thickness and noise?
    • A. 

      If section thickness increases, noise increases

    • B. 

      If section thickness increases, noise decreases

    • C. 

      If section thickness decreases, noise decreases

    • D. 

      If section thickness decreases, noise remains unchanged

  • 22. 
    What term is used to describe as the ability to display an image of a large object that is only slightly different in density from its surroundings?
    • A. 

      Spatial resolution

    • B. 

      Contrast resolution

    • C. 

      Linearity

    • D. 

      Clarity

  • 23. 
    Which of the following should be viewed with relatively wide window widths?
    • A. 

      Lung and inner ear

    • B. 

      Lung and brain

    • C. 

      Inner ear and brain

  • 24. 
    How often should an average CT number water calibration test be performed?
    • A. 

      Daily

    • B. 

      Monthly

    • C. 

      Yearly

    • D. 

      Weekly

  • 25. 
    Which of the following accurately describes the relationship between patient dose and pitch?
    • A. 

      If pitch increases, patient dose increases

    • B. 

      If pitch increases, patient dose decreases

    • C. 

      If pitch decreases, patient dose decreases

    • D. 

      If pitch decreases, patient dose remains unchanged