LRA 222: LAW AND RESEARCH METHODS – EXAM
primarily due to Compton interaction between x ray photons and matter. - answers✔✔Scatter
radiation is...
the energy of the photon. Atomic # does not affect the probability of Compton Interactions . -
answers✔✔The probability of Compton interaction occurring is related to?
the area of Collimation (field size) and patients thickness. - answers✔✔The volume of tissue
irradiated is determined by?
A large field size (increasing the volume of the tissue) and high kVp. - answers✔✔What
produces the greatest amount of scatter exiting the patient?
Round - answers✔✔The unrestricted primary x-ray beam is ...
decreasing field size and reducing the volume of tissue irradiated. - answers✔✔Increasing
Collimation means...
Reduces scatter radiation, reducing the overall amount of radiation reaching the IR (image
receptor). - answers✔✔What does significant Collimation do?
mAs - answers✔✔To compensate for the reduction of scatter radiation reaching the IR (image
receptor) what must be increased?
, A flat piece of lead with a hole in it that has a flange direction toward the patient. -
answers✔✔What is a cone or cylinder?
the collimator - answers✔✔What is the most effective and often used radiographic beam
restriction device?
aperture diaphragm - answers✔✔Because it is situated very close to the focal spot, using the
__________ _________ results in an image with the most edge unsharpness.
Rectangular or square - answers✔✔What is the field shape produced by a collimator is
The automatic collimator adjusts the beam size to the size of the IR (image receptor) -
answers✔✔What happens when the IR (image receptor) is in the bucky tray?
Between the patient and the IR (image receptor) - answers✔✔Where is the Grid found?
When the part measures more than 10 cm and transmits a lot of scatter, and 60 kVp is needed
for the exams. - answers✔✔When are Grids typically used?
Because scattered photons change directions after Compton Interaction, they no longer travel in
the same direction as the transmitted photons and will be absorbed by the LEAD strips in the
Grid. - answers✔✔What happens between Compton Interaction and Grids?
Grid frequency - answers✔✔The number of lead strips per inch/cm is called:
The Grid Ratio - answers✔✔The relationship between the height of the lead strips and the
distance between them is called:
primarily due to Compton interaction between x ray photons and matter. - answers✔✔Scatter
radiation is...
the energy of the photon. Atomic # does not affect the probability of Compton Interactions . -
answers✔✔The probability of Compton interaction occurring is related to?
the area of Collimation (field size) and patients thickness. - answers✔✔The volume of tissue
irradiated is determined by?
A large field size (increasing the volume of the tissue) and high kVp. - answers✔✔What
produces the greatest amount of scatter exiting the patient?
Round - answers✔✔The unrestricted primary x-ray beam is ...
decreasing field size and reducing the volume of tissue irradiated. - answers✔✔Increasing
Collimation means...
Reduces scatter radiation, reducing the overall amount of radiation reaching the IR (image
receptor). - answers✔✔What does significant Collimation do?
mAs - answers✔✔To compensate for the reduction of scatter radiation reaching the IR (image
receptor) what must be increased?
, A flat piece of lead with a hole in it that has a flange direction toward the patient. -
answers✔✔What is a cone or cylinder?
the collimator - answers✔✔What is the most effective and often used radiographic beam
restriction device?
aperture diaphragm - answers✔✔Because it is situated very close to the focal spot, using the
__________ _________ results in an image with the most edge unsharpness.
Rectangular or square - answers✔✔What is the field shape produced by a collimator is
The automatic collimator adjusts the beam size to the size of the IR (image receptor) -
answers✔✔What happens when the IR (image receptor) is in the bucky tray?
Between the patient and the IR (image receptor) - answers✔✔Where is the Grid found?
When the part measures more than 10 cm and transmits a lot of scatter, and 60 kVp is needed
for the exams. - answers✔✔When are Grids typically used?
Because scattered photons change directions after Compton Interaction, they no longer travel in
the same direction as the transmitted photons and will be absorbed by the LEAD strips in the
Grid. - answers✔✔What happens between Compton Interaction and Grids?
Grid frequency - answers✔✔The number of lead strips per inch/cm is called:
The Grid Ratio - answers✔✔The relationship between the height of the lead strips and the
distance between them is called:
