RADS 304 Unit 3 Exam Review Activity- 3/26/24

Scatter must be controlled because...

• it is detrimental to quality

• it increases contrast

• decreases the energy of scatter exiting the patient if high energy created

• reduces occupational dose

Scatter control is accomplished by the use of...

• grids only

• grids and air gap only

• grids and beam restrictors and air gap

• only beam restrictors

Two factors affecting the amount of scatter produced in the patient are...

• thickness of the part and mAs

• volume of tissue irradiated and kVp

• atomic number of the part and kVp

• small FOV and mAs

The higher the kVp the ..... the energy of the scatter radiation exiting the patient.

• lower

• higher

• same or equal

• none of these

Beam restrictors are the only method for ...

• is made of aluminum and is attached in the collimator box

• Reducing the total quantity of photons by half of the original

• reducing ALL the scatter that exposes the IR

• reducing the scatter produced in the patient

Grids are used to improve the image quality by

• absorbing the scatter produced in the patient from reaching the IR

• reducing the scatter exiting the patient from reaching the Technologist

• reducing the production of scatter in the patient from degrading the image

• blocking the radiation from reaching the IR

Scatter is primarily a result of...

• Photoelectric interactions

• Classical interactions

• Characteristic Interactions

• Compton Interactions

The volume of tissue irradiated depends on...

• Part thickness and IR size

• IR size and atomic number

• FOV size and Part Thickness

• FOV size and atomic number

Patient dose increases when....

• Collimation is increased

• FOV is increased

Scatter radiation is decreased when...

• Collimation is increased

• FOV is increased