Trivia Quiz On CT Imaging Procedures

52 Questions

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Computed Tomography Quizzes & Trivia

A computed tomography(CT) scan is used by doctors to view the inner organs of your body like bones and tissues for diagnosing diseases and evaluating injuries. Through the help of CT scan, doctors can see and observe the various parts of your body like bones of shoulders, spine, abdomen etc. This quiz has been designed to test your knowledge about CT imaging procedures. Read the questions carefully and answer. So, let's try out the quiz. All the best!


Questions and Answers
  • 1. 
    High resolution CT is most commonly used for the evaluation of the
    • A. 

      Pancreas

    • B. 

      Brain

    • C. 

      Lung

    • D. 

      Mediastinum

  • 2. 
    During a CT guided needle biopsy, the needle insertion site is usually anaesthetized with
    • A. 

      Diazepam

    • B. 

      Lidocaine

    • C. 

      Lithium

    • D. 

      Oxycodone HCI

  • 3. 
    Which of the following abnormal findings reduces the density of the liver
    • A. 

      Hyperdense cyst

    • B. 

      Contrast enhancing tumor

    • C. 

      Fatty liver

    • D. 

      All the above

  • 4. 
    Which of the following sets of section widths and spacing is the most suitable for a general survey CT of the neck
    • A. 

      1.5 mm thick every 1.5

    • B. 

      3mm thick every 5mm

    • C. 

      5mm thick every 5mm

    • D. 

      10mm thick every 10mm

  • 5. 
    The _________ gland is located in the AP portion of the mediastinum and is often identified with CT when scanning younger PT's
    • A. 

      Thyroid

    • B. 

      Luschka

    • C. 

      Thymus

    • D. 

      Parathyroid

  • 6. 
    Which of the following CT Studies of the head may be performed W/O contrast
    • A. 

      CT angiogram for the Circle of Willis

    • B. 

      Coronal CT scan to rule out pituitary tumor

    • C. 

      CT of the brain to r/o hematoma

    • D. 

      CT of the brain to r/o metastatic disease

  • 7. 
    CT scanning of the liver for tumour evaluation should not be performed during which of the following phases of contrast enhancement
    • A. 

      Non equilibrium phase

    • B. 

      Equilibrium phase

    • C. 

      Dynamic phase

    • D. 

      Bolus phase

  • 8. 
    The Kidneys are located anatomically between which vertebrae
    • A. 

      T6 and L2

    • B. 

      T12 and L3

    • C. 

      L2 and L4

    • D. 

      L3 and S1

  • 9. 
    Axial CT images of the knee may be acquired in five separate series with knee flexions of 0, 15, 30, and 45 degrees in order to demonstrate the
    • A. 

      Tibial plateau

    • B. 

      Patellofemoral joint

    • C. 

      Medial and lateral menisci

    • D. 

      Anterior cruciate ligament

  • 10. 
    CT images acquired of the foot in a plane perpendicular to the long axis of the scout image shown are considered __________ images
    • A. 

      Axial

    • B. 

      Sagittal

    • C. 

      Coronal

    • D. 

      Transaxial

  • 11. 
    Which of the following is used to describe a set of rules for solving a mathematical problem?
    • A. 

      Reconstruction

    • B. 

      Algorithm

    • C. 

      Function

    • D. 

      Array

  • 12. 
    A 15 second spiral CT scan of the pelvis is performed using 1.0cm aperture size. If a pitch of 1:1 was used for the total length of coverage for this scan would be
    • A. 

      50cm

    • B. 

      100cm

    • C. 

      150cm

    • D. 

      250cm

  • 13. 
    • A. 

      From the feet toward the head with PT's left on the viewers left

    • B. 

      From the feet toward the head with the PT's left on the viewers right

    • C. 

      From the head toward the feet with the PT's right on the viewers right

    • D. 

      From the head toward the feet with the PT's right on the viewers left

  • 14. 
    In which of the following cranial nerves would an acoustic neuroma be found?
    • A. 

      Third

    • B. 

      Eighth

    • C. 

      Tenth

    • D. 

      Twelfth

  • 15. 
    Which of the following interscan delays would be used for a dynamic CT study of the chest?
    • A. 

      4 sec

    • B. 

      8 sec

    • C. 

      12 sec

    • D. 

      15 sec

  • 16. 
    Which of the following types of pathologic conditions cannot be easily diagnosed from a CT Scan of the brain?
    • A. 

      Astrocytoma

    • B. 

      Traumatic herorrhage

    • C. 

      Cerebral infarct

    • D. 

      Alzheimers disease

  • 17. 
    • A. 

      Head

    • B. 

      Body

    • C. 

      Tail

    • D. 

      Uncinate process

  • 18. 
    Before scanning the liver after a bolus injection of contrast, a delay of ___ should be applied
    • A. 

      0 sec

    • B. 

      20 sec

    • C. 

      45 sec

    • D. 

      120 sec

  • 19. 
    Which of the following technical changes may increase the partial volume effect present on a spiral CT scan
    • A. 

      Decrease in pitch

    • B. 

      Decrease in aperture size

    • C. 

      Increase in matrix size

    • D. 

      Increase in pitch

  • 20. 
    During which of the following CT exams is misregistration artefact most likely to occur
    • A. 

      Brain

    • B. 

      Pelvis

    • C. 

      Neck

    • D. 

      Abdomen

  • 21. 
    • A. 

      2 only

    • B. 

      1 and 2

    • C. 

      2 and 3

    • D. 

      1, 2, and 3

  • 22. 
    The matrix size describes which of the following
    • A. 

      Aperture size used during data acquistion

    • B. 

      Number of pixels used to display an image

    • C. 

      Relationship between the FOV and algorithm

    • D. 

      None of the above

  • 23. 
    Which of the following is not an iterative method of CT image reconstruction
    • A. 

      Point by point correction

    • B. 

      Fourier transform

    • C. 

      Simultaneous reconstruction

    • D. 

      Ray by ray correction

  • 24. 
    In the following formula used to calculate the linear attenuation coefficient, I=Ioe -ux, the symbol Io identifies
    • A. 

      Eulers constant

    • B. 

      Incident intensity

    • C. 

      Absorber thickness

    • D. 

      Transmitted intensity

  • 25. 
    Which of the following would increase the noise of a CT image?
    • A. 

      Increased MAS

    • B. 

      Decreased aperture size

    • C. 

      Decreased filtration

    • D. 

      Decreased matrix size

  • 26. 
    The types of detectors used in CT include 1 gas 2 stimulable phosphor 3 scintillation crystal
    • A. 

      1 only

    • B. 

      3 only

    • C. 

      1 and 3

    • D. 

      2 and 3

  • 27. 
    Which of the following is used to archive CT images?
    • A. 

      3.5 floppy disc

    • B. 

      Magnetic tape

    • C. 

      VHS tape

    • D. 

      Magnetic optical disk

  • 28. 
    Which of the following manipulations involve the use of image data?
    • A. 

      Adjusting the width and level of the window setting

    • B. 

      Decreasing the DFOV

    • C. 

      Changing the algorithm selection

    • D. 

      Increasing the matrix size

  • 29. 
    Collimation of the CT X-ray beam occurs 1 At the x-ray tube regulating the thickness 2 Just prior to the PT controlling the volume of tissue irradiated 3 Prior to the detectors limiting the amount of scatter radiation absorbed
    • A. 

      1 only

    • B. 

      1 and 2

    • C. 

      1 and 3

    • D. 

      1, 2, and 3

  • 30. 
    An average CT number value for bone is?
    • A. 

      + 100 HU

    • B. 

      + 500 HU

    • C. 

      +1000 HU

    • D. 

      +3000 HU

  • 31. 
    The major disadvantage of the back projection method of image reconstruction is the appearance of the
    • A. 

      Partial volume effect

    • B. 

      Ring artifact

    • C. 

      Gibbs phenomenon

    • D. 

      Star artifact

  • 32. 
    Which of the following is used in gas ionization CT detectors?
    • A. 

      Neon

    • B. 

      Xenon

    • C. 

      Helium

    • D. 

      Nitrogen

  • 33. 
    The most effective method of reducing involuntary motion on a CT image is through
    • A. 

      Immobilization

    • B. 

      Thorough explanation of the exam

    • C. 

      Reduce scan times

    • D. 

      Physical restraints

  • 34. 
    Which of the following CT film formats is the largest image for the viewer on the 14x17 film?
    • A. 

      4:1

    • B. 

      6:1

    • C. 

      12:1

    • D. 

      20:1

  • 35. 
    Which of the following matrices provides the greatest spatial resolution?
    • A. 

      256x256

    • B. 

      320x320

    • C. 

      512x512

    • D. 

      1024x1024

  • 36. 
    The data acquisition system of a CT scanner 1 Measures transmitted intensity 2 Converts transmission data into a digital signal 3 Sends the digital information to the central processing unit
    • A. 

      1 only

    • B. 

      2 only

    • C. 

      1 and 3

    • D. 

      1, 2, and 3

  • 37. 
    Which of the following terms is used to describe a set of rules for solving a mathematical problem?
    • A. 

      Reconstruction

    • B. 

      Algorithm

    • C. 

      Function

    • D. 

      Array

  • 38. 
    The contrast resolution of a CT scanner is not related to which of the following
    • A. 

      Focal spot size

    • B. 

      Section width

    • C. 

      Reconstruction algorithm

    • D. 

      Signal to noise ratio

  • 39. 
    The spatial resolution of a CT scanner is usually expressed as
    • A. 

      HU

    • B. 

      Lp/cm

    • C. 

      U

    • D. 

      Hz

  • 40. 
    When a SFOV is chosen, the CT technologist is controlling
    • A. 

      The diameter of acquisition/reconstruction for the anatomic section

    • B. 

      The number of activated detectors within the array

    • C. 

      The correction factors for the specific area of anatomic interest

    • D. 

      All of the above

  • 41. 
    • A. 

      Pixels with values between +200 and -1000 HU appear white

    • B. 

      Pixels with values greater than +200 HU appear black

    • C. 

      Pixels with values -300 and + 700 HU units are assigned shades of gray

    • D. 

      Pixels with values between -1200 and +1200 HU units are assigned shades of gray

  • 42. 
    The dimension of a voxel may be decreased by which of the following
    • A. 

      Decreasing the section width

    • B. 

      Decreasing the matrix size

    • C. 

      Increasing the section width

    • D. 

      Increasing the DFOV

  • 43. 
    A CT image of a homogeneous material contains variations in CT number from pixel to pixel. This image has
    • A. 

      High contrast

    • B. 

      Sensitivity

    • C. 

      Definition

    • D. 

      Noise

  • 44. 
    Which of the following are correct statements concerning the translate rotate mode of CT Data acquisition1 Circular detector arrays of 360 are used2 Data are collected only during translation3 The method was used in first and second generation Scanners
    • A. 

      2 only

    • B. 

      3 only

    • C. 

      1 and 2

    • D. 

      2 and 3

  • 45. 
    As the attenuation of a volume of tissue decreases, the transmitted intensity of a CT beam
    • A. 

      Increases

    • B. 

      Remains unchanged

    • C. 

      Decreases

    • D. 

      Increases to a peak value and then rapidly decreases

  • 46. 
    Which of the following statements comparing the efficiency of scintillation and gas ionization detectors is correct?
    • A. 

      Both have approximately the same capture efficiency

    • B. 

      The scintillation detector has a higher capture efficiency

    • C. 

      Unlike the scintillation detector, the gas ionization detector has a problem with after glow

    • D. 

      Gas ionization detectors have a higher conversion efficiency

  • 47. 
    Which of the following terms accurately describes the type of x-ray beam used in a third generation CT scanner?
    • A. 

      Pencil beam

    • B. 

      Fan beam

    • C. 

      Nutating beam

    • D. 

      Electron beam

  • 48. 
    The phantom image is used to test which of the following image quality factors of a CT scanner
    • A. 

      Spatial resolution

    • B. 

      Noise

    • C. 

      Linearity

    • D. 

      Contrast resolution

  • 49. 
    The adjacent pixels are measured to have a difference of 1 HU unit. This amount to a tissue density difference of approximately
    • A. 

      0.1%

    • B. 

      1.0%

    • C. 

      10%

    • D. 

      25%

  • 50. 
    The intensity of the CT x-ray beam can be increased by
    • A. 

      Increasing filtration

    • B. 

      Decreasing collimation

    • C. 

      Decreasing applied tube voltage

    • D. 

      Increasing collimation

  • 51. 
    When choosing a window to display a CT image, the width defines the
    • A. 

      Midpoint of the range of pixels displayed

    • B. 

      Range of CT numbers to be displayed

    • C. 

      Range of pixel values included in a ROI

    • D. 

      Average CT number of the tissue on interest

  • 52. 
    Which of the following technologic advances has led to the development of spiral and helical CT scanning 1 Slip ring technology 2 Electron beam technology 3 High efficiency x-ray tubes
    • A. 

      1 only

    • B. 

      1 and 2

    • C. 

      1 and 3

    • D. 

      1, 2, and 3