Bushong chapter 11 questions with
verified solutions
what is contrast - correct answer ✔✔it is the degree of difference in optical
density between different areas of a radiograph
what is contrast resolution - correct answer ✔✔the ability to image adjacent
similar tissues. It's ability to display fine detail is determined by scatter radiation
and noise
what is the remnant beam - correct answer ✔✔it is the attenuated beam that
passes through the patient and reaches the image receptor. It can also be refered
to as image forming X-rays
what are the 2 types of x-rays that are responsible for forming the image - correct
answer ✔✔1. the x-rays that scatter in and through the patient
2. the ones that pass through the patient forming the remnant beam
when the kvp goes up what happens to contrast and scale - correct answer
✔✔you get long scale and low contrast
when kVp is decreased what happens to contrast and scale - correct answer
✔✔you get low scale and high contrast
, what 3 factors lead to increased scatter - correct answer ✔✔increased kVp,
patient thickness, and x-ray field size
what are the 3 principle types of beam restricting devices - correct answer
✔✔cones, collimators, and aperture diaphragm
what are the 2 principle ways we control scatter radiation - correct answer
✔✔grids, and beam restricting devices
what are the 2 types of x-rays that are responsible for optical density - correct
answer ✔✔those that pass through the patient and and those that are Compton
scatter
what does Compton scatter do to a radiograph - correct answer ✔✔leads to
increased noise leading to reduced contrast and contrast resolution
how is scatter radiation related to the collimated field size - correct answer
✔✔directly. as the field size decreases so does the scatter radiation
how does increasing KVP increase scatter - correct answer ✔✔as energy increases
both photoelectric and Compton interactions decrease however photoelectric
interactions decrease at a much faster pace. this means that Compton scatter will
be more prolific
how is field size related to scatter - correct answer ✔✔as the field size increases
so does the amount of scatter produced
verified solutions
what is contrast - correct answer ✔✔it is the degree of difference in optical
density between different areas of a radiograph
what is contrast resolution - correct answer ✔✔the ability to image adjacent
similar tissues. It's ability to display fine detail is determined by scatter radiation
and noise
what is the remnant beam - correct answer ✔✔it is the attenuated beam that
passes through the patient and reaches the image receptor. It can also be refered
to as image forming X-rays
what are the 2 types of x-rays that are responsible for forming the image - correct
answer ✔✔1. the x-rays that scatter in and through the patient
2. the ones that pass through the patient forming the remnant beam
when the kvp goes up what happens to contrast and scale - correct answer
✔✔you get long scale and low contrast
when kVp is decreased what happens to contrast and scale - correct answer
✔✔you get low scale and high contrast
, what 3 factors lead to increased scatter - correct answer ✔✔increased kVp,
patient thickness, and x-ray field size
what are the 3 principle types of beam restricting devices - correct answer
✔✔cones, collimators, and aperture diaphragm
what are the 2 principle ways we control scatter radiation - correct answer
✔✔grids, and beam restricting devices
what are the 2 types of x-rays that are responsible for optical density - correct
answer ✔✔those that pass through the patient and and those that are Compton
scatter
what does Compton scatter do to a radiograph - correct answer ✔✔leads to
increased noise leading to reduced contrast and contrast resolution
how is scatter radiation related to the collimated field size - correct answer
✔✔directly. as the field size decreases so does the scatter radiation
how does increasing KVP increase scatter - correct answer ✔✔as energy increases
both photoelectric and Compton interactions decrease however photoelectric
interactions decrease at a much faster pace. this means that Compton scatter will
be more prolific
how is field size related to scatter - correct answer ✔✔as the field size increases
so does the amount of scatter produced
