Deck 8: X-ray Emission

Question 1

If the intensity of a 70 kVp exposure at 20 mAs is 1.0 mGyₐ,what would it be at 5 mAs?

A) 0.25 mGya
B) 0.5 mGya
C) 2.0 mGya
D) 4.0 mGya

Answer 1

0.25 mGya

Question 2

Beam quality is affected by _____.

A) mAs and distance
B) kVp and mAs
C) kVp and filtration
D) filtration and mAs

Answer 2

kVp and filtration

Question 3

An x-ray beam that could pass through dense tissue would have high _____.

A) penetrability
B) quality
C) quantity
D) both A and B

Answer 3

both A and B

Question 4

A low quality beam would also have low _____.

A) penetrability
B) quantity
C) mAs
D) intensity

Question 5

X-ray quantity increases in direct proportion to increases in _____.

A) mAs
B) kVp
C) distance
D) filtration

Question 6

The inverse square law has the same effect on optical density and x-ray _____.

A) intensity
B) exposure
C) quantity
D) all of the above

Question 7

X-ray intensity is proportional to _____.

A) distance
B) kVp
C) kVp2
D) filtration

Question 8

Grays in air are the measurement for x-ray _____.

A) quantity
B) exposure
C) intensity
D) all of the above

Question 9

If the quantity of electrons hitting the target are doubled,the x-ray quantity is _____.

A) reduced by half
B) just slightly increased
C) increased by a factor of two
D) increased by a factor of four

Question 10

If a technologist changes the technique from 70 kVp @ 200 mAs to 70 kVp @ 400 mAs,the x-ray intensity will _____ and optical density will _____.

A) double, double
B) double, remain the same
C) remain the same, remain the same
D) remain the same, double

Question 11

The number of x-rays in the useful beam defines x-ray _____.

A) kVp
B) quality
C) quantity
D) mAs

Question 12

The penetrability of an x-ray beam is called x-ray _____.

A) quantity
B) quality
C) intensity
D) all of the above

Question 13

Standard x-ray machines produce about _____ µGyₐ/mAs at 70 kVp measured at 100 cm SID.

A) 20
B) 50
C) 100
D) 200

Question 14

If an exposure is 0.5 mGyₐ at an SID of 40 inches,what would the exposure be at an SID of 60 inches?

A) 0.22.2 mGya
B) 0.333 mGya
C) 0.75 mGya
D) 1.125 mGya

Question 15

If filter thickness is _____,then x-ray intensity is _____.

A) reduced, reduced
B) increased, reduced
C) reduced, increased
D) both B and C

Question 16

An increase of 15% in kVp is equivalent to increasing mAs _____.

A) 15%
B) 30%
C) 50%
D) 100%

Question 17

The half value layer (HVL)of an x-ray beam is a measurement of beam _____.

A) intensity
B) quality
C) quantity
D) all of the above

Question 18

Image contrast is affected by _____.

A) beam quality
B) kVp
C) mAs
D) both A and B

Question 19

A 10% increase in kVp has _____ effect on x-ray intensity than/as a 10% increase in mAs.

A) the same
B) much greater
C) less
D) much less

Question 20

If the distance from the source to the image (SID)is reduced by half,how is the x-ray intensity at the image affected?

A) It is increased 4 times.
B) It is doubled.
C) It is reduced by 1/2.
D) It is reduced by 1/4.

Question 21

Added filtration will _____ beam quality and _____ beam quantity.

A) decrease, increase
B) decrease, decrease
C) increase, decrease
D) increase, increase

Question 22

X-ray beam quality is improved by _____.

A) lowering kVp
B) decreasing filtration
C) increasing filtration
D) increasing distance

Question 23

A compensating filter is used to create _____ optical density with a body part of _____ thickness.

A) uniform, non-uniform
B) non-uniform, non-uniform
C) non-uniform, uniform
D) uniform, uniform

Question 24

The HVL is lowered by a decrease in _____.

A) kVp
B) mAs
C) distance
D) both A and C

Question 25

The main purpose of added filtration is to reduce _____.

A) the HVL
B) patient dose
C) beam quality
D) beam penetrability