Deck 7: X-ray Production

Question 1

The quantity of bremsstrahlung radiation increases proportionately with increased _____.

A) kVp
B) mAs
C) filtration
D) rotor speed

Answer 1

mAs

Question 2

An increase in mAs would _________ the ______________ of the emission spectrum.

A) increase, position alone
B) increase, amplitude alone
C) increase, amplitude and position
D) not affect, amplitude and position

Answer 2

increase, amplitude alone

Question 3

Characteristic K-shell x-rays have an effective energy of _____ keV.

A) 0.6
B) 3
C) 12
D) 69

Answer 3

69

Question 4

The production of heat at the anode is directly proportional to _________.

A) rotor speed
B) filament current
C) kVp
D) tube current

Question 5

An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of _____ keV.

A) 30
B) 69
C) 100
D) 140

Question 6

Characteristic x-rays are produced by __________________.

A) braking electrons
B) excitation of outer shell electrons
C) nuclear fragmentation
D) released binding energy

Question 7

Approximately _____ of the kinetic energy of the projectile electrons is converted to x-rays at the target.

A) 1%
B) 10%
C) 50%
D) 99%

Question 8

The efficiency of x-ray production increases as ______ increases.

A) mA
B) kVp
C) time
D) Both A and B

Question 9

Bremsstrahlung x-rays are produced by ______________ at the target.

A) outer shell excitation
B) slowing electrons
C) K-shell interactions
D) L-shell interactions

Question 10

At the target, the projectile electrons interact with ____________.

A) outer-shell electrons
B) inner-shell electrons
C) atomic nuclei
D) Both A and B

Question 11

The ______________ of an x-ray beam is higher when the peak of the emission spectrum is further to the __________.

A) quality, right
B) quantity, right
C) quality, left
D) quantity, left

Question 12

An increase in kVp would ________ the ______________ of the emission spectrum.

A) increase, position alone
B) increase, amplitude alone
C) increase, amplitude and position
D) not affect, amplitude and position

Question 13

Electron interactions at the inner-shell of the target atoms produce _____ radiation.

A) gamma
B) Bremsstrahlung
C) characteristic
D) all of the above kinds of

Question 14

Projectile electrons travel from ______________.

A) anode to cathode
B) cathode to anode
C) target to patient
D) inner shell to outer shell

Question 15

The useful characteristic x-rays from tungsten targets are ___-shell x-rays.

A) K
B) L
C) M
D) N

Question 16

Most of the heat generated at the target is due to ___________.

A) inner-shell ionization
B) outer-shell excitation
C) nucleus bombardment
D) K x-rays

Question 17

At 55 kVp, _____ of the x-rays produced are bremsstrahlung.

A) 15%
B) 80%
C) 100%
D) none

Question 18

Most of the x-rays produced at the target are _______________.

A) bremsstrahlung
B) characteristic
C) gamma
D) beta

Question 19

The efficiency of x-ray production is ___________ the tube current.

A) indirectly proportional to
B) directly proportional to
C) not affected by
D) strongly affected by

Question 20

During an exposure, most of the ________ energy of the projectile electrons is converted to ________.

A) kinetic, x-rays
B) x-ray, kinetic
C) kinetic, heat
D) heat, kinetic

Question 21

How does added filtration affect the emission spectrum?

A) Increased amplitude and a shift to the right
B) Increased amplitude and a shift to the right
C) Reduced amplitude and a shift to the right
D) Reduced amplitude and a shift to the left

Question 22

Changes in _______ result in directly proportional changes in the amplitude of the emission spectrum.

A) mA
B) time
C) kVp
D) Both A and B

Question 23

The amplitude of the emission spectrum with a _________ generator is __________ it is with a three-phase generator.

A) single-phase, lower than
B) high frequency, lower than
C) single-phase, higher than
D) single-phase, the same as

Question 24

The discrete portion of the x-ray emission spectrum would change position with a change in _____________.

A) kVp
B) target material
C) voltage ripple
D) Both A and B

Question 25

A 15% increase in kVp is equivalent to ___________________.

A) increasing the mAs 15%
B) doubling the mAs
C) increasing the mAs 1 1/2 times
D) tripling the mAs