Exam (elaborations)
ARRT Practice Test - Safety
- Institution
- System Of Equations And Inequalities
ARRT Practice Test - Safety
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ARRT Practice Test - Safety- ANS-*added filtration is adjusted by a medical radiation physicist, not be the
radiographer. Compensating filtration devices, such as wedge filters are manipulated by
the radiographer.
- ANS-*air kerma has replaced coulombs per kilogram.
- ANS-*as a result of differential absorption of the beam photoelectric effect produces
contrast on the image.
- ANS-*highest mAs and highest kVp
- ANS-*it is important to choose the correct algorithm for each exam
- ANS-*lowest mAs and lowest kVp
- ANS-*radiation effects manifested in the next generation are called genetic effects.
- ANS-*radon is present in the environment as a gas, frequently found in the
basements of older homes.
- ANS-*some sources indicate it must be within 4-6 kVp
- ANS-*the fastest practical speed for the part being radiographed should be used to
reduce pt dose. Slow speed increases patient dose.
- ANS-*W^R is used to modify the absorbed dose amount to account for greater
damage caused by high LET radiations. Xrays have lower LET so the W^R is only 1.
- ANS-A
*line-focus principle in action
- ANS-B.
*2% of SID
A lead apron of at least what thickness should be worn while being exposed to scatter
radiation?
, A. 0.25 mm Pb equivalent
B. 0.5 mm Pb equivalent
C. 0.5 mm Al equivalent
D. 0.25 mm Al equivalent - ANS-B. .5 mm Pb equivalent
*shielding of lead (Pb) equivalent, not aluminum (Al) equivalent, is used to protect from
scatter radiation. The requirement for a lead apron is at least .25mm Pb equivalent; it
should be .5mm Pb equivalent.
A radiation dose that if received by the entire population would cause the same genetic
injury as the total of doses received by the members actually being exposed is called:
A. genetically significant dose
B. doubling dose
C. mean marrow dose
D. genetic dose - ANS-A. Genetically Significant Dose
*This describes the GSD, or genetically significant dose(not called genetic dose). The
doubling dose is the amount of radiation that causes the number mutations in a
population to double. Mean marrow dose is the average dose to active bone marrow as
an indicator of somatic effects on population.
Cataractogenesis, life span shortening, embryologic effects, and carcinogenesis are
examples of:
A. short-term somatic effects
B. genetic effects
C. acute radiation syndrome
D. long-term somatic effects - ANS-D. Long term Somatic Effects
*all are examples of radiation effects on teh individual being exposed.
Compton interaction:
A. increases contrast in the radiographic image
B. results in scattering of the incident electrons
C. decreases recorded detail in the radiographic image
D. decreases contrast in the radiographic image. - ANS-D. decreases contrast in the
radiographic image
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