Computed Tomography Quiz Test! Trivia

23 Questions | Total Attempts: 3598

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Computed Tomography Quizzes & Trivia

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

      IV contrast material is better visualized

    • B. 

      Streak aritfacts are reduced or eliminated

    • C. 

      The PT is more comfortable during scanning

    • D. 

      The PT receives a lower dose of radiation

  • 2. 
    Which of the following is true concerning CT studies of the musculoskeletal system
    • A. 

      IV contrast is never necessary

    • B. 

      A single bone window is adequate for most studies

    • C. 

      When possible, the normal side should be examined, with the two sides placed symmetrically

    • D. 

      Slice thickness is typically 1-2mm and never exceeds 3mm

  • 3. 
    A typical presentation of an abcess on an contrast enhanced CT study is
    • A. 

      That the abscess remains entirely unaffected by the contrast material and presents as a low attenuatioin area

    • B. 

      A low attenuation are surrounded by a ring of enhancement

    • C. 

      A high attenuation are because the contrast pools in the abcess, often creating clear fluid levels

    • D. 

      That the following contrast enhancement, the abcess becomes isodense with the surrounding tissue

  • 4. 
    When is it essential to perform a precontrasted study on the abdomen along with the postcontrasted images
    • A. 

      When the PT has a history of HEP B

    • B. 

      When the contrasted exam is performed by injection at a high flow rate with the use of a mechanical injector and the scans are performed in the spiral mode

    • C. 

      When the entire liver cannot be imaged before equilibrium phase

    • D. 

      When the PT has a history of CHF.

  • 5. 
    Enhancement of most brain lesions is due to
    • A. 

      The intrinsic vascularity of the brain

    • B. 

      The high subject contrast inherent in the brain

    • C. 

      The disruption of the blood brain barrier

    • D. 

      Their unique ability to resist IV contrast media

  • 6. 
    Pleural effusion can be defined as
    • A. 

      Fluid in the pericardial cavity, between the visceral and parietal pericardia

    • B. 

      An accumulation of serous fluid in the peritoneal cavity

    • C. 

      A local generalized condition in which the body tissue contain an excessive amount of tissue fluid

    • D. 

      The escape of fluid into the thoracic cavity, between the visceral and parietal pleurae

  • 7. 
    What technique can be used to improve visualization of the small pituitary lesions?
    • A. 

      IV contrast dose is doubled, and scanning begins 45 minutes after injection

    • B. 

      Scans are performed without an IV contrast medium

    • C. 

      Intrathecal contrast is administrered by lumbar puncture with scanning approximately 1 hour later

    • D. 

      A bolus of IV contrast, followed by rapid sequence scanning

  • 8. 
    Which two strategies can reduce the effect of dental filling in a sinus study
    • A. 

      High mA and short scan time

    • B. 

      Low KVP and high contrast or bone algorithm

    • C. 

      Adjust the angle of the gantry and widen the window with

    • D. 

      Smal focal spot and small display field

  • 9. 
    In filming the brain, why is it common practice to use a wider window width through the posterior fossa
    • A. 

      To reduce the radiation exposure to the PT

    • B. 

      To decrease the pixel size

    • C. 

      To reduce the appearance of beam hardening artifacts

    • D. 

      To compensate for the small focal spot that is used in the posterior fossa

  • 10. 
    • A. 

      Glioblastoma

    • B. 

      Krukenberg tumor

    • C. 

      Wilms tumor

    • D. 

      Plasmacytosis

  • 11. 
    Which of the following is affected by the slice spacing in the CT study
    • A. 

      Spatial resolution

    • B. 

      Quantum mottle

    • C. 

      Radiation dose to the PT

    • D. 

      Signal to noise ratio

  • 12. 
    What is an advantage of using a spiral scan technique for a thorax study
    • A. 

      It is less likely to miss small lesions

    • B. 

      Image noise is decreased

    • C. 

      It is not necessary for the PT to hold their breath

    • D. 

      The software that corrects for table motion also eliminates artifacts from PT motion

  • 13. 
    What is the name of the pine cone shaped structure of the brain that can often be seen as calcified in CT images
    • A. 

      Choroid plexus

    • B. 

      Pineal gland

    • C. 

      Caudate nucleus

    • D. 

      Middle cerebral artery

  • 14. 
    What is the normal range of CT attenuation measurements for a non contrasted liver in an adult PT
    • A. 

      -60 to -20 HU

    • B. 

      0 to 25 HU

    • C. 

      38 to 80 HU

    • D. 

      108 to 143 HU

  • 15. 
    What part of the inner ear play a role in the sense of equilibrium
    • A. 

      Incus

    • B. 

      Epitympanic recess

    • C. 

      Semicircular canals

    • D. 

      Superior sagittal sinus

  • 16. 
    By selecting an algorithm, the tech selects
    • A. 

      A mathematical formula for processing data

    • B. 

      The average photon energy of the x-ray beam

    • C. 

      The shades of gray displayed on the image

    • D. 

      The center pixel value in the window width

  • 17. 
    What limitation is inherent in using a partial scan to create an image?
    • A. 

      Image noise is always excessive because adequate MAS cannot be achieved

    • B. 

      Scan data cannot be retrospectively segmented

    • C. 

      Longer scan time increases the likelihood of motion artifacts

    • D. 

      Beam hardening artifacts are increased

  • 18. 
    The right ventricle sends blood to the
    • A. 

      Right atrium

    • B. 

      Left atrium

    • C. 

      Inferior vena cave

    • D. 

      Lungs

  • 19. 
    What organ produces the digestive enzymes protease, lipase, and amylase?
    • A. 

      Gallbladder

    • B. 

      Stomach

    • C. 

      Small bowel

    • D. 

      Pancreas

  • 20. 
    An area on a scan has an associated measurment of 900HU, it is most likely to be composed of
    • A. 

      Bone

    • B. 

      Fat

    • C. 

      Water

    • D. 

      Air

  • 21. 
    Crohn disease is primarily a disease of the
    • A. 

      Gastrointestinal tract

    • B. 

      Respiratory system

    • C. 

      Lymphatic system

    • D. 

      Intergumentary system

  • 22. 
    The area within the gantry for which raw data are acquired is called
    • A. 

      SFOV

    • B. 

      DFOV

    • C. 

      Scannable range

    • D. 

      Gantry aperture

  • 23. 
    Another word used to describe a volume element is
    • A. 

      Pixel

    • B. 

      Particle

    • C. 

      Interpolated plane

    • D. 

      Voxel