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IMAGE ACQUISITION: RTBC ASSESSMENTS EXAM 3 QUESTIONS WITH COMPLETE ANSWERS!!
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IMAGE ACQUISITION: RTBC ASSESSMENTS EXAM 3 QUESTIONS WITH COMPLETE ANSWERS!!
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IMAGE ACQUISITION: RTBC ASSESSMENTSEXAM 3 QUESTIONS WITH COMPLETE
ANSWERS!!
What is the primary purpose of diagnostic filtration in radiography?
A) increase image contrast
B) increase receptor exposure
C) decrease patient dose
D) decrease occupational dose Answer - Decrease patient dose
How is the x-ray beam changed by the addition of one half-value layer (HVL) of
filtration?
A) 50% increase in quantity
B) 50% decrease in quantity
C) 50% increase in quality
D) 50% decrease in quality Answer - 50% decrease in quantity
A radiologist receives an equivalent dose of 100 microsieverts (μSv) while
standing 25 cm from a patient during a fluoroscopy procedure. Estimate the
equivalent dose if the radiologist stood at 10 cm from the patient.
A) 16 μSv
B) 40 μSv
C) 250 μSv
D) 625 μSv Answer - 625 μSv
,How does decreasing filtration thickness affect the quality of the x-ray beam?
A) increased quality
B) decreased quality
C) no change in quality Answer - Decreased quality
Which two of the following are affected by the half-value layer (HVL) of an x-ray
tube?
- image quality
- occupational dose
- patient dose Answer - Image quality and patient dose
A radiation worker received a radiation dose of 5 milligrays (mGy) while
participating in a fluoroscopy procedure for 10 minutes. What radiation dose
would have been received by the worker if they reduced their time in the
radiation field to only 5 minutes?
A) 1.25 mGy
B) 2.5 mGy
C) 5 mGy
D) 10 mGy Answer - 2.5 mGy
What term describes the expansion of the x-ray beam as it travels through
space?
A) Divergent
B) Convergent
C) Polychromatic
D) Polyenergetic Answer - Divergent
, What is the intensity of an x-ray beam created with one half-value layer (HVL)
of filtration if the unfiltered intensity is 100 microgray (μGy)?
A) 200 μGy
B) 150 μGy
C) 50 μGy
D) 25 μGy
E) 12.5 μGy Answer - 50 μGy
The thickness of inherent filtration within general use x-ray tube assemblies is
equal to approximately:
A) 0.5 mm aluminum equivalence (Al. eq)
B) 5 mm aluminum equivalence (Al. eq)
C) 0.5 mm lead equivalence (Al. eq)
D) 5 mm lead equivalence (Al. eq) Answer - 0.5 mm aluminum equivalence (Al.
eq.)
If the half-value layer (HVL) of shielding material is equal to 2 mm, how much
radiation will transmit through 6 mm of this material?
A) 75% of the original quantity
B) 50% of the original quantity
C) 25% of the original quantity
D) 12.5% of the original quantity Answer - 12.5% of the original quantity
During a surgical procedure using three (3) minutes of fluoroscopy time, a
radiographer receives an effective dose of 1 millisievert (mSv). What effective
dose would be experienced by the radiographer if the fluoroscopy time is
doubled?
A) 0.5 mSv
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