FINAL TQ PART III

Question 1

x-ray beam intensity is what equation? unit?

Answer 1

quantity x quality

roentgen (R), coulombs per kg

Question 2

what are the four basic factors affecting quantity of x-ray beam photons?

Answer 2

mA
kVp
distance
filtration

Question 3

tube current measured in?

filament circuit current?

Answer 3

mA

amps

Question 4

affect of doubling the mAs on emitted x-rays?

affect on curve?

Answer 4

double the number of emitted x-rays

directly increase the area of Brem. curve, no affect on energy distribution

Question 5

doubling the kVp has what effect on beam intensity?

Answer 5

increases beam intensity four fold

affects x-ray beam quality via film blackening

Question 6

rule used to maintain constant film density?

Answer 6

15% rule

15% should be accompanied by a 50% decrease of the mAs

Question 7

radiation intensity varies _____ with the distance from the source? via what law?

Answer 7

inversely

inverse square law

Question 8

affect of filtration on the Brem. curve? (how is the curve shifted)

filtration increases the effective beam energy via the principle known as _____?

Answer 8

right shift, more energy

hardening which is the preferential loss of lower energy photons

Question 9

two factors affecting quality of x-ray beam photons?

Answer 9

kilovoltage (kVp)

filtration

Question 10

kilovolt peak affects quantity and quality how?

Answer 10

increase

increase

Question 11

filtration affects quality and quantity how?

Answer 11

decrease

increase