Computed Tomography (CT) Scan Quiz

154 Questions | Total Attempts: 152

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Computed Tomography Quizzes & Trivia

Computer tomography scans commonly known as CT scans make use of computer-processed combinations of many X-ray measurements taken at different angles. Take up the quiz below and gauge you knowledge on CT scans. All the best.


Questions and Answers
  • 1. 
    Using _________ reconstruction filter would decrease the appearance of noise in a CT image.1. no2. a sharp3. a smooth
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      2&3

    • D. 

      3 only

  • 2. 
    A ___________ scan uses only a single projection.1. conventional, or serial2. helical3. localizer
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1,2,&3

  • 3. 
    Which of the following statements is FALSE regarding 3D SSD?
    • A. 

      Helical image data is well suited for 3D SSD because there is minimal misregistration or gaps.

    • B. 

      The volume data, from which the 3D SSD is generated, is created by combining transverse, sagittal, and coronal reconstructions

    • C. 

      The tissue surface may be selected by using a threshold value equal to the tissue's CT number.

    • D. 

      Patient motion during the scan is detrimental to the quality of the 3D images

  • 4. 
    Which type(s) of storage media may hold CT image data?1. internal hard disk2. CD3. re-writable optical disk
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1,2,& 3

  • 5. 
    ____________ may have to be edited from the data set to get a diagnostic MIP of a CTA exam.
    • A. 

      Iodinated contrast media

    • B. 

      Vessels of inetrest

    • C. 

      Air

    • D. 

      Bones

  • 6. 
    Which of the following is NOT an advantage of a helical study compared to a conventional, serial CT study?
    • A. 

      Minimal anatomical mis-registration sometimes caused by inconsistent breath holding

    • B. 

      Shorter total exam time

    • C. 

      Can retrospectively reconstruct a slice at any arbitrary position

    • D. 

      Offers the best image quality for a brain exam

  • 7. 
    Which of the following utilizes convolution?1. 3D SSD2. fourier transform3. filtered back projection
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 8. 
    In which technique are tissues other than the surface of structure excluded by setting a threshold value and eliminating pixels above or below that threshold?
    • A. 

      Volume rendering

    • B. 

      Multi-planar reconstruction

    • C. 

      Maximum intensity projection

    • D. 

      3D shaded surface display

  • 9. 
    From which of the following can the most diagnostic multi-planar reconstructions be generated?1. stacked transverse images from a helical scan2. stacked transverse images from a conventional, serial scan3. stacked localizer images
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 10. 
    The actual attenuation data measured by the detectors from all projections during a scan is contained in CT ____________ data.1. image2. convolved3. raw
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 11. 
    Which of the following is TRUE regarding the slice thickness of an image reconstructed from a helical scan?1. on a multi-row detector scanner, the thickness is equal to the beam collimation.2. on a single-row detector scanner, the thickness is equal to the beam collimation.3. on a single-row detector scanner, the thickness can be varied retrospectively.
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      2 & 3

    • D. 

      1, 2, & 3

  • 12. 
    A retrospective reconstruction, in which the reconstruction field-of-view is varied, uses:
    • A. 

      A reconstructed image in the sagittal plane

    • B. 

      CT raw data

    • C. 

      More photons

    • D. 

      CT image data

  • 13. 
    Which of the following is common to both localizer scan and a conventional, serial CT scan?
    • A. 

      They both produce saggital images

    • B. 

      The patient table moves at a constant velocity

    • C. 

      They both produce cross-sectional images

    • D. 

      The x-ray tube makes complete 360 degree rotations

  • 14. 
    Which of the following statements are TRUE?1. the amplified electrical signal obtained from the detectors must be digitized.2. digital CT images are numerical representations of cross-sectional anatomy.3. digital signals may be formed by sampling analog signals at discrete time intervals.
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 15. 
    ___________________ is the mathematical process used by single row detector scanners to reconstruct CT image from raw data.
    • A. 

      Weighted averaging

    • B. 

      Filtered back projection

    • C. 

      The fourier transform

    • D. 

      Integration of the area under the curve

  • 16. 
    3D shaded surface displays are performed on CT:1. image data2. raw data3. attenuation profiles
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 17. 
    A pixel is a :
    • A. 

      Bright artifact on a film

    • B. 

      Single 3D volume element within a volume of anatomical data

    • C. 

      Single 2D picture element within the image plane

    • D. 

      Range of gray levels on a CT image

  • 18. 
    The pencil thin section of the x-ray fan beam that strikes a single detector is called a:
    • A. 

      Line

    • B. 

      Projection

    • C. 

      View

    • D. 

      Ray

  • 19. 
    A kernel is a:
    • A. 

      Component in the x-ray tube

    • B. 

      Post-processing filter applied to image data

    • C. 

      Type of detector

    • D. 

      Filter applied to the CT raw data

  • 20. 
    An increase in ___________ does NOT occur in the resulting images when applying a sharp, or high-pass reconstruction filter during the image reconstruction of CT raw data.1. contrast resolution2. edge enhancement3. the appearance of noise
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 21. 
    CTA images come from a __________ scan.1. conventional, or serial2. helical3. localizer
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2, & 3

  • 22. 
    If an image matrix has 360 rows and 360 columns, how many pixels are there in the image?
    • A. 

      21,600

    • B. 

      129,600

    • C. 

      259,200

    • D. 

      379,800

  • 23. 
    The ______________ determines the intensity of the laser beam in a laser camera.1. intensifying grid2. pixel values in the image data3. mgnifying power of the lens
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      3 only

    • D. 

      1, 2 & 3

  • 24. 
    Which of the following is a reconstruction technique applied to the raw data after the primary reconstruction has already been accomplished?
    • A. 

      Maximum intensity projection

    • B. 

      Volume rendering

    • C. 

      Retrospective reconstruction

    • D. 

      Multi-planar reconstruction

  • 25. 
    What does convolution do to the image quality when it is added to the back projection reconstruction process?
    • A. 

      Normalizes the attenuation coefficients to ensure tissues are displayed with correct CT numbers.

    • B. 

      Increases the number of projections thereby reducing streaking artifacts

    • C. 

      Improves contrast resolution by reducing scatter radiation

    • D. 

      Enhances important characteristics of attenuation profiles thus reducing streak and star artifacts