Prime Factors

Question 1

List 3 principle factors that affect X-ray QUALITY and QUANTITY

Answer 1

mAs
Kilovoltage
Distance

Question 2

Quantity measures the ____ of x ray photons in the useful beam

Answer 2

Number

Question 3

Another 3 terms for quantity is :

Answer 3

Output
Intensity
Exposure

Question 4

mAs is the prime controller of ____

Answer 4

Quantity

Question 5

Quantity is directly affected by ___, distance and filtration

Answer 5

Kvp

Question 6

Quality measures the ____ ability of the x ray beam or distance it travels in matter

Answer 6

Penetrating

Question 7

Quality is numerically represented by ___

Answer 7

HVL (half value layer)

Question 8

The greater the HVL the greater the ____

Answer 8

Quality

Question 9

mAs is the measurement of the ___

Answer 9

X ray tube current

Question 10

The # electrons crossing the tube from cathode to anode per second is considered to be :

Answer 10

mAs (milliamperage per second)

Question 11

As mA increases, so does the number # of ___

Answer 11

Electrons

Question 12

As time increases, so does the # of ___

Answer 12

Electrons

Question 13

mA and time are both ____ proportional to the number of electrons cross the tube

Answer 13

Directly

Question 14

mA and time are ____ proportional to the number of X ray photons created

Answer 14

Directly

Question 15

The more mA there is the more ____ we’re making

Answer 15

Electrons

Question 16

Exposure index does/does not indicate patient dose

Answer 16

Does not

Question 17

mAs is the prime controller of image receptor exposure. It has a ____ proportional relationship

Answer 17

Direct

Question 18

As long as ____ is constant, any combo of mA and time will create the same IR exposure

Answer 18

mAs

Question 19

Increasing kvp cause a/an ____ in the speed and energy of the electrons applied across the tube

Answer 19

Increase

Question 20

As kvp increases, so does the # of ___ interactions at the target (quantity)

Answer 20

Electrons

Question 21

15% increase in kvp = ____ # of photons

Answer 21

Double

Question 22

Double kvp = # of ____ increases about _ times

Answer 22

Photons, 4

Question 23

As kvp increases, so does the energy of each ____ (quality)

Answer 23

Electron

Question 24

Greater photon energy = ___ penetrability

Answer 24

More

Question 25

Increasing kvp will cause a/an ___ in the speed of energy of the electrons applied across the tube

Answer 25

Increase

Question 26

Kvp affects both ____ and ____ of the x ray beam

Answer 26

Quantity and quality

Question 27

Kvp affects both ___ and ___ of the x ray beam

Answer 27

Quality and quantity

Question 28

An increase in kvp causes a/an ____ in penetrability and a ____ in image contrast

Answer 28

Increase, decrease

Question 29

____ is a characteristic of image quality

Answer 29

Contrast

Question 30

The ability to distinguish the differences in adjacent tissues or structures is ___

Answer 30

Contrast

Question 31

A primary beam with ____ kv results in an overall rise in penetration through all tissues

Answer 31

Greater

Question 32

High kvp = ___ contrast = long scale

Answer 32

Low

Question 33

Low kvp = ____ contrast = short scale

Answer 33

High

Question 34

Kvp should/should not be used to control IR exposure

Answer 34

Should NOT

Question 35

At ____ kvp, more radiation is absorbed by the patient

Answer 35

Lower

Question 36

In general, ___ kvp and ___ mAs will reduce patient dose but at the expense of contrast

Answer 36

Higher, lower

Question 37

Increasing distance causes a/an ____ of exposure

Answer 37

Decrease

Question 38

We use the _____ square law to compensate foR IR exposure changes when distance changes must be made

Answer 38

Direct

Question 39

Setting the appropriate mAs, kvp and distance is the responsibility of the ___

Answer 39

Radiographer

Question 40

The radiographer should select the kvp based on the desired ____

Answer 40

Contrast

Question 41

The radiographer should adjust ___ to provide the appropriate total exposure to the receptor

Answer 41

mAs

Question 42

As mAs increases, the radiographic exposure ___

Answer 42

Increases

Question 43

As mAs decreases, the radiographic exposure ____

Answer 43

Decreases

Question 44

As kV increases, the radiographic exposure ____

Answer 44

Increases

Question 45

As the kV decreases, the radiographic exposure ___

Answer 45

Decreases

Question 46

As the SID increases, the radiographic exposure __

Answer 46

Decreases

Question 47

As the SID decreases, the radiographic exposure ___

Answer 47

Increases

Question 48

Any change that increases scatter will ____ radiographic exposure

Answer 48

Increase

Question 49

Low contrast = ___ shades of gray

Answer 49

Many

Question 50

High contrast = ___ shades of gray

Answer 50

Few

Question 51

____ changes to mAs makes no major change to contrast

Answer 51

Small

Question 52

As kV increases, penetrability increases, and the radiographic CONTRAST ___

Answer 52

Decreases

Question 53

As kV decreases, penetrability decreases, and the radiographic CONTRAST ___

Answer 53

Increases

Question 54

Kvp is the ____ of contrast

Answer 54

Prime controller

Question 55

___ changes to SID make no major changes to contrast

Answer 55

Small

Question 56

Any changes that increase scatter will ___ contrast

Answer 56

Decrease

Question 57

High kvp ___ image contrast because mode uniform penetration occurs between dense and less dense structures, thereby reducing the degree of differential absorption

Answer 57

Decreases

Question 58

Low kvp ___ contrast because most of the low energy photons are absorbed by the higher density structures while the rest completely penetrate the less dense structures

Answer 58

Increases

Question 59

The ___ has a low subject contrast

Answer 59

Abdomen

Question 60

The ___ has a high subject contrast

Answer 60

Chest