Deck 8: X-ray Emission

Question 1

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

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

Answer 1

Both B and C

Question 2

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 2

Both A and B

Question 3

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

Answer 3

much greater

Question 4

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 5

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 6

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

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

Question 7

A low quality beam would also have low _____.

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

Question 8

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 9

Image contrast is affected by ________.

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

Question 10

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

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

Question 11

X-ray intensity is proportional to ______.

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

Question 12

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

Question 13

Beam quality is affected by ______________.

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

Question 14

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

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

Question 15

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

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

Question 16

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

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

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

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 19

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

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

Question 20

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 21

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 22

Added filtration will ______ beam quality and ______ beam quantity.

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

Question 23

The main purpose of added filtration is to reduce ____________.

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

Question 24

X-ray beam quality is improved by ____________.

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

Question 25

The HVL is lowered by a decrease in ________.

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