Contrast
What is the controlling factor for subject contrast?
kVp
Increasing kVp by 15% and halving mAs will do what to receptor exposure? (increase, decrease, maintain)
NOTE: You must express your answer with A LOT of enthusiasm!
Maintain
What orbits the nucleus of an atom?
Electron
All else being equal, if I double mAs, what happens to receptor exposure?
SPECIAL: You must answer in your best game show voice
Exposure doubles
As tissue thickness increases, what happens to x-ray attenuation? NOTE: You must "sing" the answer
Increases
As tissue thickness increases, what happens to x-ray absorption?
Absorption Increases
65 kVp @ 10 mAs. Increase subject contrast while maintaining exposure.
55 kVp @ 20 mAs
What type of charge do protons have?
Positive
What is the exposure maintenance formula (square law)? Come write on board.
mAs1/mAs2 = D1^2/D2^2
Low contrast = __________ scale
Long scale
High contrast = _________ scale
Short scale
Quantum Mottle
What prime factor primarily affects beam quality?
kVp
What is the inverse square law? Come write on board.
I1/I2 = D2^2/D1^2
When a lot of gray tones are seen on an x-ray, is this high or low contrast?
Low contrast
When more extreme black and whites are seen on an x-ray which type of contrast is this (high or low)
High
70 kVp @ 20 mAs. Decrease subject contrast while maintaining overall exposure.
81 kVp @ 10 mAs
Varying degrees of x-ray attenuation by different tissues is called what?
NOTE: You must wave your hands in the air when you say your answer
Differential Absorption
What law says, mAs = mAs
SPECIAL: Your entire team must say the answer together, 1, 2, 3.... ANSWER
Reciprocity Law
What creates unwanted exposure on images?
Scatter radiation
kVp
Amount of irradiated material
Type of irradiated material
Subject contrast
80 kVp @ 20 mAs @ 60 inches. What mAs do you need to maintain exposure at 120 inches?
NOTE: You must start your answer with, "According to the laws of Radiography..."
80 mAs
Adding or removing electrons from an atom is called what?
Ionization
The intensity of the beam is 40 mR at 40 inches. what is the intensity at 20 inches?
SPECIAL: You must begin your answer with, "I have consulted with Wilhelm Roentgen, and my answer is...."
120 mR
What type of interaction is the main contributor to scatter?
Compton scatter