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FREE RADIOLOGY AND STUDY GAMES ABOUT
RADT334-UNIT 4 EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -67 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: What kVp is used to penetrate barium in a contrast examination?
Answer:
90 kVp Question 2: How will the x-ray emission spectrum be changed if you add filtration to the x-ray tube?
Answer:
lower amplitude and shift to right Question 3: How will the emission spectrum change if an exposure is first made at 80 kVp then repeated at 90 kVp?
Answer:
higher amplitude and shift to right Question 4: Which 3 of the 5 basic mechanisms of x-ray interaction with matter are not important in diagnostic radiology?
Answer:
Classical/coherent, photodisintegration, pair production
Question 5: effect of increasing distance on x-ray quantity
Answer:
decrease geometrically
Question 6: Effective energy of the x-ray beam; penetrating ability
Answer:
x-ray quality
Question 7: effect of increasing filtration on x-ray quality
Answer:
increase
Question 8: what is the relationship between x-ray quantity and mAs?
Answer:
directly proportional
Question 9: X-ray intensity, measured in milliroentgens (mR) or air KERMA (mGy)
Answer:
x-ray quantity Question 10: Does adding filtration to the x-ray beam affect the quantity of x-rays reaching the image receptor? How?
Answer:
Yes, will reduce the number/quantity of x-rays reaching the detector
Question 11: X-ray ionization resulting in x-ray scattering
Answer:
Compton effect
Question 12: Why is the x-ray tube considered an inefficient device?
Answer:
less than 1% of projectile electrons are converted into x-rays
Question 13: calculate the energy of the characteristic x-ray produced when a K-shell electron (BE-69keV) is replaced by an M-shell electron (BE - 3keV) in a tungsten atom
Answer:
66 keV Question 14: What will happen to the x-ray emission spectrum if you change your imaging system from single phase to three phase?
Answer:
higher amplitude and shift to right Question 15: Addition of a filter shifts the x-ray emission spectrum to the high-energy side, resulting in an x-ray beam with higher effective energy, greater penetrability, and higher quality, but less intensity.
Answer:
filtered x-ray spectrum
Question 16: The unit of x-ray quantity
Answer:
Milliroentgen (mR) or milligray (mGy) Question 17: Scattering of very-low-energy x-rays with no loss of energy; also called coherent or Thompson scattering
Answer:
classical scattering Question 18: The quantity of matter per unit volume, usually specified in kilograms per cubic meter (kg/m3). Sometimes reported in grams per cubic centimeter (gm/cm3).
Answer:
mass density Question 19: Having a single energy. Characteristic x-rays are monoenergetic, and the effective x-ray energy of an x-ray beam is the monoenergetic equivalent of the actual beam.
Answer:
monoenergetic
Question 20: What is the range of energies of bremsstrahlung x-rays?
Answer:
From near zero to an energy in keV equal to the kVp setting Question 21: The reduction in x-ray beam intensity as a result of photoelectric absorption and Compton scattering
Answer:
attenuation
Question 22: effect of increasing kVp on x-ray quantity
Answer:
increase geometrically Question 23: Why are iodinated compounds such excellent agents for vascular contrast examinations?
Answer:
high atomic number and high mass density Question 24: The thickness of filter or other absorbing material that will reduce intensity to half its original value
Answer:
HVL Question 25: Good practice but not on the unit test: A chest radiograph taken at 180 cm SID results in an expsoure of 12 mR. What would the exposure be if the same radiographic factors were used at 100 cm SID?
Answer:
38.9 mR Question 26: A compensating filter designed to shape the useful x-ray beam to the anatomic structure under examination so that the exposure of the image receptor will be more uniform
Answer:
wedge filter
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