Chapter 4 Rad 2

Question 1

KVP controls (3)

Answer 1

Energy, Penetration, Quality

Question 2

MAS controls (3)

Answer 2

Quantity, Amount, Number of Electrons

Question 3

Inorganic Grid Interspacer

Answer 3

Aluminum

Question 4

Organic Grid Interspacer

Answer 4

Cardboard, Balsa Wood

Question 5

Adult skull is age ___ & up?

Answer 5

6 years old ( 75kvp)

Question 6

Name 2 destructive illnesses that would make you decrease technique

Answer 6

COPD, Pneumothorax

Question 7

Name 2 Additive illnesses that would have you increase technique

Answer 7

Pneumonia, Pleural Effusion, Atelectasis

Question 8

Formula for Grid Ratio

Answer 8

Heigh of PB strips/ Distance between Pb Strips

Question 9

Do grids decrease the production of scatter?

Answer 9

No

Question 10

Scatter is _____

Answer 10

density

Question 11

When dealing with grids ___ on the Left ___ on the right

Answer 11

divide on the left, Multiply on the Right

Question 12

Ratio 5:1 has what conversion factor?

Answer 12

2

Question 13

Ratio 6:1 has what conversion factor?

Answer 13

3

Question 14

Ratio 8:1 has what conversion factor?

Answer 14

4

Question 15

Ratio 12:1 has what conversion factor?

Answer 15

5

Question 16

Ratio 16:1 has what conversion factor?

Answer 16

6

Question 17

Every time you double the speed you must ____ the mas in ___

Answer 17

cut, half

Question 18

Every time you cut the speed in half you must ___ the ___

Answer 18

Double, Mas

Question 19

Increased Screen Speed =

Answer 19

Decreased Patient Dose and Decreased Detail

Question 20

Decreased Screen Speed =

Answer 20

Increased Patient Dose and Increased Detail

Question 21

Inverse Square Law Formula

Answer 21

old mAs/ New mAs = old distance squared/ new distance squared

Question 22

If you double the distance from the source or double the SID the exposure will be?

Answer 22

One fourth as strong

Question 23

If you cut the distance from the source in half or cut the SID in half the exposure will be?

Answer 23

Four times as strong

Question 24

Above 90 kVp = if kV increases by 15

Answer 24

cut mas in half

Question 25

Above 90 kVp = if kV decreases by 15

Answer 25

double mas

Question 26

Below 90 kVp= if kV increases by 10

Answer 26

cut mas in half

Question 27

Below 90 kVp= if kV decreases by 10

Answer 27

double mas

Question 28

In order to see a visible change in density you must increase or decrease the mAs by?

Answer 28

30%

Question 29

as mas is _______ the quantity of radiation is increased and density increases.

Answer 29

increased

Question 30

Milliamperage and Exposure Time are ______ related when maintaing the same mAs.

Answer 30

inversely

Question 31

the minimum change needed to correct for a density error is determined by multiplying or dividing by?

Answer 31

2

Question 32

high contrast = ____ scale, ____ kv

Answer 32

short scale, low KV

Question 33

Low contrast = ____ scale, ____kv

Answer 33

long scale, high kv

Question 34

____ influences density, ____ controls density

Answer 34

kVp, mAs

Question 35

Geometric factors of detail (3)

Answer 35

OID, SID, FS

Question 36

What controls contrast?

Answer 36

KV

Question 37

High kV creates more densities but with fewer difference low contrast _____ scale

Answer 37

long

Question 38

Low kV creates fewer densities but with greater differences high contrast _____ scale

Answer 38

short

Question 39

Increased scatter = ______ contrast

Answer 39

decrease

Question 40

Decreased scatter = ______ contrast

Answer 40

increased

Question 41

FS size affects ______

Answer 41

recorded detail/ spatial resolution

Question 42

Penumbra

Answer 42

Unsharpness

Question 43

Umbra

Answer 43

Recorded Detail

Question 44

Magnification =

Answer 44

size distortion

Question 45

True=

Answer 45

Shape Distortion

Question 46

For every 1'' OID you must increase SID by ____ to compensate

Answer 46

8''

Question 47

Where is scatter produced?

Answer 47

In the patient

Question 48

What is the 1st step in protection?

Answer 48

Collimation

Question 49

Generators with more efficient output ( like a 3 phase ) require ___ technique settings?

Answer 49

LOWER

Question 50

If the tube operates at 70kvp or higher must have ___ of filtration?

Answer 50

2.5mm/al

Question 51

main purpose of tube filtration is to

Answer 51

decrease patients skin dose

Question 52

Increased collimation = ______ scatter and density

Answer 52

decreased

Question 53

Positive Contrasts

Answer 53

BArium, Iodine

Question 54

Negative Contrast

Answer 54

Air CO 2