What is the primary beam? 
The beam that enters the patient 
What is the remnant beam? 
The beam that exits the patient containing good x-rays and scatter
What is scatter radiation?
radiation that bounces off the patient, has unwanted density.
What produces scatter radiation?
The patient 
What factor should we use to make a change to our exposure?
mAs
What is 100% rule?
The rule that tells us that if we double the mAs we double the exposure.
What is the 15% rule? 
The rule that tells us that about 10 KV will double the exposure.
What is the relationship between 40 SID and 72 SID?
It’s 3, if you increase the SID the signal goes down.
What is the purpose of the grid? 
To remove/decrease scatter radiation
What is the best way to reduce the production of scatter radiation?
Collimation
What is the purpose of total filtration?
To remove low energy from the beam
What is the anode heal effect? 
Intensity is not uniform across the anode
What is the primary cause of quantum noise? 
Not enough signal (usually mAs) 
