Which of the following statements is true?
A. Single energy CT scanners and dual energy scanners use the same X-ray source but single energy CT scanners are set with a low energy source, whereas dual energy scanners are set with a high energy source
B. Single energy CT scanners differ from dual energy scanners by using different settings for the X-ray source.
C. Dual energy CT scanners run with an X-Ray tube potential set to double the energy set with single energy CT scanners.
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What was the main advantage of using cone-beam spiral CT scanners in comparison to fan beam scanners?
Allow three-dimensional projection techniques as well as the development of reconstruction techniques operating in three dimensions.
B. The time taken to complete the scan was increased.
C. The elimination of the lateral movement of the tube-detector
What is an average dose received by an adult patient undergoing one CT scan?
A. 50-100 of the radiation dose unit of measurement.
B. 2–5 of the radiation dose unit of measurement.
C. 500-1000 of the radiation dose unit of measurement.
During a CT scan, sections of the body are exposed to radiation. The effective dose is the sum of the doses for all organs, multiplied by the respective tissue weighting factors. The unit of measurement for an effective radiation dose is:
A. millisievert (mSv)
B. milligray (mGy)
C. milliCurie (mCi)
Filtered back projection improves the quality of the final image by:
A. increasing contrast.
B. reducing pixilation.
C. reducing blurring.
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