Xch 7,10,11,12,13 - Tech Unit 5 & 6

Front 1

In a bremsstrahlung interaction, the closer the incident travels to the nucleus, the lower the energy of the resultant x-ray photon.

Back 1

False

Front 2

In a bremsstrahlung interaction, the closer the incident travels to the nucleus, the lower the energy of the resultant x-ray photon.

Back 2

False

Front 3

Filtration removes a portion of the useful beam.

Back 3

True

Front 4

A compound filter uses two or more materials to enhance the absorbing ability of the filter.

Back 4

True

Front 5

The inherent filtration of a mammographic unit is less than that of a regular diagnostic unit.

Back 5

True

Front 6

All filtration can be expressed in terms of the thickness of:

Back 6

Al/Eq

Front 7

The most common filter material used is

Back 7

aluminum

Front 8

What percentage of target interaction results in the production of x-ray photons?

Back 8

1 percent

Front 9

Filtration affects patient dose by:

Back 9

removing low-energy photons

Front 10

Total filtration is equal to the sum of ____ filtration

Back 10

inherent and added

Front 11

Bremsstrahlung interactions may occur only when the incident electron interacts with the

Back 11

force field of the nucleus

Front 12

When filtration is _____, technical factors must be ___ to maintain the same density.

Back 12

increased, increased

Front 13

The amount of material that will reduce the intensity of the primary beam to one-half its original value is the

Back 13

half-value layer

Front 14

Characteristic interactions may occur only when the incident electron

Back 14

interacts with an inner-shell electron

Front 15

Filtration has what effect on patient dose?

Back 15

It decreases patient dose

Front 16

What term describes filtration that is part of the x-ray tube and the tube housing?

Back 16

inherent

Front 17

The collimator device is considered part of the ____ filtration

Back 17

added

Front 18

The thickest portion of the wedge filter is palced over the less dense part of the patient.

Back 18

True

Front 19

The problem of unequal subject density is solved by a

Back 19

compensation filter

Front 20

During a characteristic interaction, the energy of the incident electron must be ___ the electron it knocks from its orbit.

Back 20

greater than

Front 21

During a characteristic interaction, the droppping of a higher-energy state electron into a lower-energy state "hole" results

Back 21

in the emission of a photon of energy

Front 22

The half-value layer is typically expressed in

Back 22

Al/Eq

Front 23

In general, low-energy x-ray photons are

Back 23

absorbed by the patient

Front 24

Which term best describes the filtration that occurs as the primary beam passes through the glass window of the x-ray tube?

Back 24

inherent

Front 25

Filtration is the process of eliminating undesirable ____ by the insertion of absorbing materials into the primary beam.

Back 25

low-energy x-ray photons

Front 26

A Thoreaus filter combines all of the following materials except

Back 26

silver

Front 27

The factors that affect x-ray emission under the direct control of the radiographer are called the ____ factors.

Back 27

prime

Front 28

The prime factors include each of the following except filtration

Back 28

filtration

Front 29

Milliamperage-second directly affects each of the following except quantity, quality, x-ray output intensity,

Back 29

quality

Front 30

The factors that directly affect x-ray quantity are:

Back 30

mAs, distance, filtration

Front 31

Increasing the kVp on an x-ray control panel will cause ____ across the x-ray tube.

Back 31

an increase in the speed of electrons

Front 32

If the mAs used to create one image is the same as the mAs used to create a second image of the same structure, then both images should have the same

Back 32

film density

Front 33

Which atomic shell possesses the highest binding energy? K, L, M

Back 33

K

Front 34

As the electrons shells move farther from the nucleus, total electron energies ____ and binding energies ____.

Back 34

increase, decrease

Front 35

When x-ray photons interact with matter and change direction, the process is called

Back 35

scatter

Front 36

When an x-ray photon with a slightly greater energy than the binding energy of the inner-shell electron interacts with that inner-shell electron, the following interaction results:

Back 36

photoelectric absorption

Front 37

In the human body, ____ is the predominant interaction through most of the diagnostic x-ray range.

Back 37

Compton scattering

Front 38

Given 40 mA and an exposure time of 0.20 second, calculate the mAs.

Back 38

Answer 8

Front 39

An acceptable radiograph was taken using 40 mAs at 80 kVp at a distance of 60 inches. A second radiograph is requested at 40 inches. What mAs should be used to produce this radiograph with a 40-inch distance?

Back 39

18 mAs

Front 40

An acceptable radiograph was taken using 20 mAs at 70 kVp at a distance of 40 inches. A second radiograph is requested at 72 inches. What mAs should be used to produce this radiograph with a 72-inch distance?

Back 40

65 mAs

Front 41

During photoelectric absorption, the ejected electron is called a/an

Back 41

photoelectron

Front 42

Given an exposure time of 0.15 second and a milliamperage of 100, calculate the mAs.

Back 42

15 mAs

Front 43

Which of the following interactions with matter results in a radiograph with a short scale of contrast?

Back 43

photoelectric apsorption

Front 44

Which of the following interactions with matter results in a radiograph with a long scale of contrast?

Back 44

compton scattering

Front 45

During coherent scattering, the scattered photon possesses ____ as the incident photon.

Back 45

the same energy, the same frequency, and the same wavelength

Front 46

During the photoelectric interaction, as an electron transfers from an outer shell to a vacant inner shell, energy is released in the form of a

Back 46

characteristic photon