30 Questions
Which type of interaction between x-ray photons and matter results in the ionization of an inner shell electron?
Photoelectric effect
What happens to the intensity of an x-ray beam as the distance from the source increases?
It decreases according to the inverse square law
Which type of scatter radiation interacts with an outer shell electron and changes its path?
Compton scatter
What is the primary factor that impacts the incidence of scatter radiation?
Tissue thickness
What is the purpose of a grid in radiography?
To reduce scatter radiation
What is the formula for calculating the scatter-to-primary ratio in the abdomen?
3:1
Which type of interaction between x-ray photons and matter results in the momentary shift of electrons without ionization?
Coherent scattering
Which factor controls the maximum energy of photons in the x-ray beam?
kV
Which factor impacts contrast resolution in x-ray imaging?
kV
Which factor controls the number of electrons flowing from the cathode to the anode in an x-ray tube?
mA
Which factor controls the quantity of radiation produced during an x-ray exposure?
mAs
What is the main purpose of the Automatic Exposure Control (AEC) in x-ray imaging?
To terminate exposure as soon as the required quantity of remnant beam reaches the image receptor
What is the main purpose of the tube housing in an x-ray system?
To protect the tube from the environment
What is the material used to make the envelope of an x-ray tube?
Pyrex glass
Which one of the following is true about the Line Focus Principle?
Angling the target creates a smaller focal spot in length only.
What is the difference between the actual focal spot and the effective focal spot?
The actual focal spot is the size of the cup and the effective focal spot is the size that the focal spot appears to be.
What is the primary benefit of using Automatic Exposure Control (AEC) in imaging?
AEC eliminates the need for guessing the attenuation of structures being imaged.
Which cells should be utilized when imaging the chest?
Left and right cells to image the lungs.
What is the primary cause of Bremsstrahlung production in x-ray tubes?
Interactions between projectile electrons and the positive charge of the nucleus.
What does the X-ray Emission Spectrum represent?
The intensity of x-rays emitted.
What happens when the mAs is doubled in x-ray production?
The number of electrons and photons travelling from cathode to anode doubles.
Which interaction occurs only at energies over 1.02 MeV?
Pair production
What happens in photodisintegration?
Photon is absorbed and emits a nucleon
Which interaction has no relevance to diagnostic imaging?
Photodisintegration
What is the preferred interaction for better contrast in general radiography?
Photoelectric effect
At what energy do Compton scattering and pair production occur?
Above 1.02 MeV
What is the energy of each photon emitted in pair production?
0.511 MeV
What happens to the photon in photodisintegration?
It is absorbed and emits a nucleon
Which interaction dominates at higher-energy sources in general radiography?
Compton scattering
What is the main difference between Compton scattering and pair production?
Pair production involves the emission of nucleons
Quiz: Understanding the Effects of Target Material on Photon Absorption
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