Exposure Ii Review 1

Front 1

At the anode of the x-ray tube, the energy of electrons may be changed into what type(s) of energy

Back 1

Heat Energy and Xray Energy

Front 2

When electrons are decelerated in the process of xray production, their energy is converted into ...

Back 2

Heat and Xrays

Front 3

The term that refers to the quantity of electrons moving from the cathode to the anode in the xray tube is

Back 3

Milliamperage (mA)

Front 4

An xray beam in which all the photones have the same energy is said to be

Back 4

Homogeneous and Monoenergetic

Front 5

The total quantity of electricity which flowed through a circuit during an exposure is measured by...

Back 5

mAs

Front 6

The number of xrays produced in the beam is ..... proportional to the number of electrons striking the anode

Back 6

Directly

Front 7

Radiation is emitted when an outer shell electron fills the orbit of a vacant inner shell. This type of radionation is described as

Back 7

Characteristic

Front 8

The release of electrons by the manipulation of current, producing extreme temperatures on the filament, is known as...

Back 8

thermionic emission

Front 9

In most xray tubes, there are two filaments to ...

Back 9

to provide two focal spots

Front 10

Increasing the temperature of the xray tube filament increases the ...

Back 10

mA

Front 11

The heel effect occurs because of

Back 11

xray absorption at the Anode

Front 12

Tungsten is the choice material for xray anodes because of its ....

Back 12

high atomic number

Front 13

Is the stator on the positive or negative side of the xray tube?

Back 13

Positive

Front 14

What is defined as the production of xray photons by electrostatic attraction between the incident electron and the nucleus of the tungsten atom

Back 14

bremsstrahlung interaction

Front 15

What is the source of radiation within the tube?

Back 15

Anode

Front 16

An increase in the kilovoltage applied to the tube results in what type of wavelength?

Back 16

shorter wavelengths

Front 17

What device is turned by a rotor?

Back 17

the Anode

Front 18

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

Back 18

Kinetic, Heat

Front 19

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

Back 19

Characteristic

Front 20

Most of the xrays produced at the target are ...?...

Back 20

Bremsstrahlung

Front 21

Characteristic xrays are produced by ...?....

Back 21

released binding energy

Front 22

Bremmstrahlung xrays are produced by ...?....

Back 22

Slowing electrons

Front 23

Approximately ...?... of the energy of the projectile electrons is converted to xrays at the target?

Back 23

1 percent

Front 24

Increasing kVp will do what?

Back 24

Increase the speed of electrons and increase beam quality

Front 25

The number of lead strips per inch in a grid is a measure of ..?...

Back 25

Grid Frequency

Front 26

What 2 factors determine the visibility of detail in a radiograph?

Back 26

density and contrast

Front 27

Low energy radiation will result in what type of contrast...

Back 27

Short Scale

Front 28

Why is contast needed on a radiographic image?

Back 28

Makes detail visible

Front 29

What is the effect of scatter radiation on the radiograph?

Back 29

It produces fog, destroys contrast, and is detrimental to visibility.

Front 30

If all other factors remain the same, increasing the SID whould have what effect on density of the radiograph?

Back 30

Less density

Front 31

What does radiographic density refer to?

Back 31

The amount of overall blackening on a radiograph or a particular part of the radiograph.

Front 32

Which factor is most often manipulated if a radiograph must repeated because it is too light or too dark?

Back 32

mAs

Front 33

What effect does longer exposure time have on the number of photons emitted?

Back 33

Number of photons emitted by the xray tube is larger

Front 34

What effect does higher kVp usually have on production of scatter radiation?

Back 34

Increases the amount of scatter produced.

Front 35

For maintaining original density, what is the relationship between mA and exposure time?

Back 35

mA and exposure time combinations are inversely proportional

Front 36

Radiographic distortion can be separated into two categories. What are they?

Back 36

Size and Shape

Front 37

What factors can minimize the amount of distortion that is recordded on the finished radiograph?

Back 37

Long SID and Short OID (less magnification)

Front 38

What is used to determine grid ratio?

Back 38

The height of lead stips divided by the space between the lead strips.

Front 39

What will produce a decrease in contrast without a changing density?

Back 39

Increasing kVp and decreasing mAs (15% rule)_

Front 40

Which of the primary radiographic exposure factors is/are controled by geometric factors such as distance?

Back 40

Recorded Detail

Front 41

Conditions that contribute to increased recorded detail

Back 41

Small effective focal spot size, Long SID, Short OID

Front 42

Factors that produce visible changes in radiographic contrast.

Back 42

Primary beam field size, Grid Ratio

Front 43

What physical interaction between radiation and matter most assits in producing long scale contrast?

Back 43

Compton's Scatter = FOG

Front 44

Decreased OID effect on magnification?

Back 44

Minimizes magnification

Front 45

Factors that affect radiographic density

Back 45

Distance, Grids, Anatomic Part Size.

Front 46

Interactions between xrays and matter that most assist in producing high contrast?

Back 46

Photoelectric

Front 47

Subject motion effect on recorded detail

Back 47

Loss of recorded detail