EXPOSURE VARIABLES POWERPOINT

Question 1

Electron cloud forming when the cathode filament is heated through milliamperage
(mA)

Answer 1

Thermionic Emission

Question 2

Increased mA = more heat = __________ _________

Answer 2

Increased electrons

Question 3

What is time in x ray settings

Answer 3

Length of exposure/ time of x ray production (sec)

Question 4

Time has an inverse relationship with

Answer 4

mA

Question 5

2 Advantages of Decreased Time

*Remember, if you decrease the time, you must increase the mA to prevent altering the quality of the image.

Answer 5

1. Decreased motion artifact
2. Decreased personnel exposure

Question 6

Energy / sec through an area perpendicular to beam direction

Answer 6

Beam “Quantity” or “Intensity”

Question 7

If you increase the mA, you must decrease the time to prevent altering the quality of the image. What would be an advantage to increasing the mA?

Answer 7

Obtaining images of thicker parts

Question 8

Because mA and time have an inverse relationship, when one is increased the other must be _____________ to prevent altering the quality of the image.

Answer 8

Decreased

Question 9

What exactly is mAs?

Answer 9

mA x Time (in seconds)

Question 10

Electron number is proportional to
_______________.

Answer 10

Heat
(increased mA = increased electrons)