CT IntroduCTion

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Computed Tomography Quizzes & Trivia

Questions and Answers
  • 1. 
    Which is the correct order of development?
    • A. 

      Head CT, Body CT, Spiral CT, Multislice CT

    • B. 

      Spiral CT, Body CT, Head CT, Multislice CT

    • C. 

      Multislice CT, Spiral CT, Head CT, Body CT

    • D. 

      They all were developed at the same time.

  • 2. 
    He developed basic mathematical equation which made computed tomography possible
    • A. 

      Radon

    • B. 

      Cormack

    • C. 

      Hounsfield

    • D. 

      Frank

  • 3. 
    Which of the following won the 1979 Nobel Prize for Physics for their work on computed tomography?
    • A. 

      Radon and Cormack

    • B. 

      Radon and Hounsfield

    • C. 

      Hounsfield and Cormack

    • D. 

      Johnson and Hounsfield

  • 4. 
    Which of the following are limitations of CT?
    • A. 

      Spatial resolution

    • B. 

      Relatively high patient dose

    • C. 

      Z axis reformation

    • D. 

      Distinct artifacts

    • E. 

      They all are limitations

  • 5. 
    The principle advantage of CT imaging over other x-ray imaging is:
    • A. 

      Faster throughput

    • B. 

      Improved contrast resolution

    • C. 

      Improved spatial resolution

    • D. 

      Decreased patient dose

  • 6. 
    Computed Tomography results in:
    • A. 

      Transverse Image

    • B. 

      Axial Image

    • C. 

      Transaxial Image

    • D. 

      All of the above

    • E. 

      Not all but more than one of the above

  • 7. 
    He originally applied reconstruction techniques in nuclear medicine ten years before he developed reconstruction techniques for computed tomography:
    • A. 

      Radon

    • B. 

      Hounsfield

    • C. 

      Roentgen

    • D. 

      Cormack

  • 8. 
    It may be described as a radiograph obtained with a moving source image receptor assembly:
    • A. 

      Computed Tomography

    • B. 

      Magnetic Resonance Imaging

    • C. 

      Positron Emission Imaging

    • D. 

      Conventional Tomography

  • 9. 
    Scatter radiation:
    • A. 

      Reduces radiographic contrast resolution

    • B. 

      Improve radiographic quality

    • C. 

      Improves resolution

    • D. 

      Reduces motions

  • 10. 
    The development of CT required the emergence and improvement in:
    • A. 

      Hounsfield units

    • B. 

      Size of the CT units

    • C. 

      Floor plan of the imaging suite

    • D. 

      Digital computer and special mathematics

  • 11. 
    He demonstrated the first CT Scanner in 1972 using special mathematical sequence:
    • A. 

      Cormack

    • B. 

      Hounsfield

    • C. 

      Radon

    • D. 

      Roentgen

  • 12. 
    Which are the following are advantages of CT over conventional radiography?
    • A. 

      Better contrast resolution

    • B. 

      Better spatial resolution

    • C. 

      Superimposition of tissue

    • D. 

      More scatter radiation

  • 13. 
    Computed Tomography results in:
    • A. 

      Analog Image

    • B. 

      Linear Image

    • C. 

      Digital Image

    • D. 

      Curvilinear Image

  • 14. 
    Which of the following terms does not fit?
    • A. 

      Section

    • B. 

      Slice

    • C. 

      Tomos

    • D. 

      Axial

    • E. 

      Unit

  • 15. 
    Computed tomography may be identified as:
    • A. 

      Emission tomography

    • B. 

      Transmission tomography

    • C. 

      Reflected tomography

    • D. 

      Temporal tomography

    • E. 

      Volumetrictomograph

  • 16. 
    A characteristic feature of a projection radiograph is:
    • A. 

      Poor spatial resolution

    • B. 

      Lengthy data acquisition

    • C. 

      Difficult quality control parameters

    • D. 

      Tissue superimposition

  • 17. 
    Which of the following finds application in bone mineral assay for evaluation of osteoporosis?
    • A. 

      Radioisotope emission tomography

    • B. 

      Conventional radiography

    • C. 

      CT

    • D. 

      Projection radiography

  • 18. 
    Which of the following imaging modalities appeared first?
    • A. 

      Emission imaging with radioisotopes

    • B. 

      Diagnostic ultrasound

    • C. 

      Projection radiography

    • D. 

      Electron beam CT

    • E. 

      Spiral CT

  • 19. 
    Which of the following is the characteristic of a first generation CT Scanner?
    • A. 

      Detector array

    • B. 

      Fan beam

    • C. 

      Pencil beam

    • D. 

      Slip ring technology

  • 20. 
    Which of the following CT imagers is often referred to as the heart scan?
    • A. 

      Second generation

    • B. 

      Third generation

    • C. 

      Fourth generation

    • D. 

      Electron beam

    • E. 

      Spiral

  • 21. 
    Which of the following is a particular characteristic of fourth generation CT Scanners?
    • A. 

      Fan x-ray beam geometry

    • B. 

      Multielement detector array

    • C. 

      Rotate-translate motion

    • D. 

      Fixed detector array

  • 22. 
    Which of the following CT Scanners has no mechanical moving parts in the gantry?
    • A. 

      Second generation

    • B. 

      Third generation

    • C. 

      Fourth generation

    • D. 

      Electron beam

    • E. 

      Spiral

  • 23. 
    Which of the following is a characteristic of a first generation CT Scanner?
    • A. 

      Detector array

    • B. 

      Fan beam

    • C. 

      Five minute imaging time

    • D. 

      Subsecond imaging time

  • 24. 
    Which of the following features led to the development of the spiral CT Scanner?
    • A. 

      Megaheat unit x-ray tubes

    • B. 

      Molybdenum/rhodium targeted x-ray tubes

    • C. 

      Electronic slip ring

    • D. 

      High frequency generatiors

  • 25. 
    Ring artifacts are characteristic of:
    • A. 

      First generation

    • B. 

      Second generation

    • C. 

      Third generation

    • D. 

      Fourth generation

  • 26. 
    Which of the following is characteristic of a second generation CT Scanner?
    • A. 

      Able to image head only, not body

    • B. 

      Five minute imaging time

    • C. 

      Pencil shaped x-ray beam

    • D. 

      Translate - rotate motion

  • 27. 
    The principle advantage of electron beam CT is:
    • A. 

      Imaging without x-rays

    • B. 

      Large volume imaging

    • C. 

      Removal of ring artifacts

    • D. 

      Subsecond imaging time

  • 28. 
    During spiral CT, the motion of the patient couch is:
    • A. 

      Stationary

    • B. 

      Rotating

    • C. 

      Advanced step wise

    • D. 

      Alternating advance retreat

    • E. 

      Continuously advanced

  • 29. 
    Which of the following CT Scanners will most likely have the fastest scan time?
    • A. 

      Second generation

    • B. 

      Third generation

    • C. 

      Fourth generation

    • D. 

      Spiral

    • E. 

      Electron beam

  • 30. 
    Which of the following does not use an x-ray tube?
    • A. 

      Spiral CT

    • B. 

      Electron beam CT

    • C. 

      Multislice CT

    • D. 

      Third generation CT

  • 31. 
    The principle advantage to spiral CT is:
    • A. 

      Large volume imaging

    • B. 

      Imaging without x-rays

    • C. 

      Removal of ring artifacts

    • D. 

      Subsecond imaging time

  • 32. 
    Which image artifact is characteristic of third generation CT Scanners?
    • A. 

      Beam hardening

    • B. 

      Montion

    • C. 

      Ring

    • D. 

      Spoke

    • E. 

      Streak

  • 33. 
    Which of the following CT images is not limited by x-ray target heat dissipation?
    • A. 

      Second generation

    • B. 

      Third generation

    • C. 

      Fourth generation

    • D. 

      Electron beam

    • E. 

      Spiral

  • 34. 
    Which of the following is characteristic of a second generation CT Scanner?
    • A. 

      Pencil shaped x-ray beam

    • B. 

      Capable of imaging head and body

    • C. 

      Five minute imaging time

    • D. 

      Able to image head only

  • 35. 
    The formation of CT involves what three steps?
    • A. 

      Image reconstruction, electron beam manipulation and microwave attenuation

    • B. 

      Image display, anatomical border construction and microwave display of structures

    • C. 

      Data acquisition, image reconstruction, and image display

    • D. 

      None of the above

  • 36. 
    Which of the following is true concerning data acquisition in CT?
    • A. 

      X-rays pass through the patient then fall onto special detectors

    • B. 

      The detectors measure the transmission values or attenuation values

    • C. 

      Values data are recorded to meet the requirements of the reconstruction process

    • D. 

      All of the above

    • E. 

      Not all but more than one of the above

  • 37. 
    In CT, during the image reconstruction process, after enough transmission measurements have been collected by the detectors, they are sent to the computer for:
    • A. 

      Processing

    • B. 

      Display

    • C. 

      3 - D monitoring

    • D. 

      2 - D rendering

  • 38. 
    Special mathematical techniques are used in CT reconstruction of images in a finite number of steps called:
    • A. 

      Attenuation coefficient

    • B. 

      Reconstruction algorithms

    • C. 

      Display monitoring

    • D. 

      Roentgen law

  • 39. 
    The reconstruction algorithm used by Hounsfield to develop the first CT Scanner was called:
    • A. 

      Quality Montoring

    • B. 

      Algebraic Reconstruction Technique

    • C. 

      Computer bell curve technique

    • D. 

      Scientific array technique

  • 40. 
    Which of the following is central to the CT process?
    • A. 

      Computers

    • B. 

      Gantry

    • C. 

      Coils

    • D. 

      Electromagnetic

    • E. 

      Solenoid

  • 41. 
    In CT after the images have been reconstructed, the images are displayed on monitors that allow the operators to:
    • A. 

      Manipulate

    • B. 

      Store

    • C. 

      Record

    • D. 

      All of the above

    • E. 

      Not all but more than one of the above

  • 42. 
    CT communication refers to the electronic transmission of text data and images from the CT Scanner to other devices such as:
    • A. 

      Printers

    • B. 

      Diagnostic workstation

    • C. 

      Display monitors

    • D. 

      PACS workstations

    • E. 

      All the above

  • 43. 
    In CT x-rays passes through the patient and is attenuated and then measured by the:
    • A. 

      Gantry

    • B. 

      Computer

    • C. 

      Detectors

    • D. 

      Laser printer

    • E. 

      PACS cube

  • 44. 
    The _______ converts the x-ray photons into electrical signal.
    • A. 

      Beam

    • B. 

      Gantry

    • C. 

      Detector

    • D. 

      Slip ring

  • 45. 
    The digital data are sent to which of the following for image reconstruction?
    • A. 

      Computer

    • B. 

      Detector

    • C. 

      Array processor

    • D. 

      Monitor

  • 46. 
    In CT the part of the x-ray beam that falls on one detector is called: 
    • A. 

      View

    • B. 

      Projector

    • C. 

      ADC

    • D. 

      Ray

  • 47. 
    Place the following CT imagers chronologically in the order of their introduction:1) third generation2) spiral3) multisection4) electron beam
    • A. 

      1, 2, 3, 4

    • B. 

      1, 3, 4, 2

    • C. 

      1, 4, 2, 3

    • D. 

      4, 1, 2, 3

  • 48. 
    Heat dissipation is:
    • A. 

      Not a problem for first generation CT

    • B. 

      Not a problem for EBCT

    • C. 

      Not a problem for second generation CT

    • D. 

      Not a problem for third generation CT

  • 49. 
    What is the principle cause of reduced contrast in projection radiography?
    • A. 

      Useful beam radiation

    • B. 

      Scatter radiation

    • C. 

      Leakage radiation

    • D. 

      Collimator