lesson 3

Question 1

▪ primary controls quantity of the x-ray beam
▪ directly affects radiographic density

Answer 1

milliampere-sec(mAs)

Question 2

▪ It states that mA and exposure time are directly proportional.
▪ An increase in mA requires a corresponding decrease in exposure time.

Answer 2

mA-Time Relationship

Question 3

▪ primary controls the quality of the x-raybeam.
▪ directly affects the radiographic contrast. ▪ responsible for penetration
▪ responsible for secondary or scatter radiation

Answer 3

kilovoltage-peak(kVp)

Question 4

formula 1

Answer 4

mAs/mA x s

Question 5

formula 2

Answer 5

kVp=T x 2 + C

Question 6

formula 3

Answer 6

kVp + 15% = 1/2 mAs

Question 7

formula 4

Answer 7

kVp - 15% = 2 x mAs