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CT FINAL EXAM QUESTIONS AND ANSWERS 100% PASS
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CT FINAL EXAM QUESTIONS AND ANSWERS 100% PASS CT technologists must understand both the ___________ & ___________ of examinations and take steps to maximize the ________ & minimize the ____________. - risks & benefits positive, negative What are the two components regarding radiation dose to t...

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  • January 9, 2025
  • 23
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • ct final exam questions and answers 100 pass

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  • Med Cert
  • Med Cert

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CT FINAL EXAM QUESTIONS AND
ANSWERS 100% PASS

CT technologists must understand both the ___________ & ___________ of examinations and take steps

to maximize the ________ & minimize the ____________. - ✔✔risks & benefits


positive, negative


What are the two components regarding radiation dose to the patient? - ✔✔1) appropriate patient

selection


2)minumizing the dose to the pt w/ out compromising the diagnostic image quality


CT scans provide one of the ____________ radiation doses in diagnostic radiology. *** (slide 3) -

✔✔higher


--large # w/ very thin slices


X-rays damage cells in _______ ways.....how? - ✔✔2; 1) Direct interaction between an x-ray photon and

DNA bonds with the nucleus of the cell within the patient. 2) X-ray photon indirectly produces ion pairs

in tissues as it passes through the body


X-rays damage cells in two ways: - ✔✔-Direct interaction with DNA bonds.


-Indirect effect caused by ionization of chemicals in the body.


Direct Interaction is also known as.... - ✔✔Target Theory


Gestating babies are ________ radiosensitive. - ✔✔most




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,2|Page


Radiation effects may be __________ but are more likely to be seen___________________ . - ✔✔-

immediate


-over a long period of time


What are the effects of x-ray radiation?(4) - ✔✔-cancer


-genetic effects of future generations


-Long term effects (10-20 yrs)


-effects of the embryo & fetus


--first trimester=maximum radiosensitivity


The unit of x-ray exposure in air - ✔✔Roentgen (R)


Units of absorbed dose - ✔✔radiation absorbed dose=rad


SI unit=Gray(Gy)


100 rad=1 Gy


1 rad= .01 Gy or 1 cGy


Convert the following:


50 rad =


200 Gy =


.1 rad = - ✔✔.5 Gy


20,000 rad


.001 Gy or 1mGy


Determine the total dose in Gy if an exam acquires



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, 3|Page


300 slices producing 2 rads per slice. - ✔✔300 slices x 2 rad/slice = 600 rad x .01 = 6 Gy


Accounts for different types of ionizing radiation - ✔✔Quality factor (Q)


In CT, the quality factor is ? - ✔✔1


Attempts to account for the effects particular to the patient's tissue that has absorbed the radiation dose -

✔✔Effective dose


Effective dose attempts to quantify dose based upon the_________________ of certain tissues or organs. -

✔✔radiosensitivity


The uniformity of the dose __________ as the SFOV and patient thickness ___________. - ✔✔decreases


increase


organ doses are higher for children (or small adults) compared with (larger) adults - ✔✔........


Body scans are________uniform than head scans - ✔✔less


The central dose of a body scan is approximately one third - one half that of the peripheral dose - ✔✔.......


Z axis dose distribution profile describes variations that occur along the________________? - ✔✔length of

the patient


-Total dose is from the radiation to the selected slice and from scatter radiation, or "tails," from

neighboring slices


-In general, the tails will contribute approximately 25% to 40% to the total dose - ✔✔.......


Multiple scan average dose (MSAD) - ✔✔Dose calculated from multiple scans


Computed tomography dose index (CTDI) - ✔✔Reported to FDA


Slices must be contiguous




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