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Principles of Radiation Therapy - Ch. 21: Computed Tomography Simulation already passed $12.99   Add to cart

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Principles of Radiation Therapy - Ch. 21: Computed Tomography Simulation already passed

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  • Course
  • Computered Tomography
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  • Computered Tomography

Principles of Radiation Therapy - Ch. 21: Computed Tomography Simulation already passed

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  • August 9, 2024
  • 7
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Computered Tomography
  • Computered Tomography
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BravelRadon
Principles of Radiation Therapy - Ch. 21:
Computed Tomography Simulation

Prior to the use of CT in the simulation process, contouring was performed by use of solder wire or
plaster. - correct answer ✔✔True



Of the four desired qualities of a CT image, which refers to the ability to see shades of gray in the tissue?
- correct answer ✔✔image contrast



What are the varying electron densities displayed as pixels in shades of gray on the imaging screen? -
correct answer ✔✔Hounsfield Units



The dose to the skin surface from a single CT slice is in the range of: - correct answer ✔✔1 to 6 cGy



A CT scanner specifically designed for use in the radiation therapy department should have which
characteristics?



I. high performance scanner



II. laser and patient marking system



III. virtual simulation capabilities - correct answer ✔✔I. high performance scanner



II. laser and patient marking system



III. virtual simulation capabilities



The reconstructed field of view that is displayed on the computer monitor should be large enough to
display:

, I. the entire contour



II. the immobilization device



III. pertinent anatomy only - correct answer ✔✔I. the entire contour



The level of noise on a CT image is affected by which of the following factors?



I. mAs and kVp



II. filtration



III. pixel size



IV. slice thickness - correct answer ✔✔I. mAs and kVp

II. filtration

III. pixel size

IV. slice thickness



Using a higher osmolality substance such as ionic iodine can greatly reduce adverse reactions with
intravenous contrast agents. - correct answer ✔✔False



The window level on a CT image is: - correct answer ✔✔the central Hounsfield unit of all the CT numbers
displayed on an image



Image registration or fusion has all of the following characteristics except - correct answer ✔✔It ensures
that the patient is in the same position for all scans.

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